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1
Sukanta, Anbu Manimaran, M. Niranjan Sakthivel, Gopalsamy Manoranjith, and Loganathan Naveen Kumar. "Performance Enhancement of Solar Parabolic Trough Collector Using Intensified Ray Convergence System." Applied Mechanics and Materials 867 (July 2017): 191–94. http://dx.doi.org/10.4028/www.scientific.net/amm.867.191.
Повний текст джерелаАнотація:
Solar Energy is one of the forms of Renewable Energy that is available abundantly. This work is executed on the enhancement of the performance of solar parabolic trough collector using Intensified Ray Convergence System (IRCS). This paper distinguishes between the performance of solar parabolic trough collector with continuous dual axis tracking and a fixed solar parabolic trough collector (PTC) facing south (single axis tracking). The simulation and performance of the solar radiations are visualized and analyzed using TRACEPRO 6.0.2 software. The improvement in absorption of solar flux was found to be enhanced by 39.06% in PTC using dual axis tracking, absorption of solar flux increases by 52% to 200% in PTC receiver using perfect mirror than PTC using black chrome coating.
2
Alamr, Maiyada A., and Mohamed R. Gomaa. "A Review of Parabolic Trough Collector (PTC): Application and Performance Comparison." International Journal of Applied Sciences & Development 1 (December 31, 2022): 24–34. http://dx.doi.org/10.37394/232029.2022.1.4.
Повний текст джерелаАнотація:
In these circumstances, we must search forward to ‘green energy’ for power generation. Green energy means environment-friendly and non-polluting energy (inclusive of solar, biomass, wind, tidal, etc.). Concentrated Solar Power (CSP) generation is one of the maximum promising candidates for mitigating the destiny power crisis. The extracted energy from CSP technology may be very clean, dependable, and environmentally friendly. A review of the parabolic trough collector (PTC) which is one of the CSP technology with a focus on the components, the working principle, and thermal properties of the parabolic trough collector. Also, this study explains the parabolic trough power plants with tracking systems, from the other hand, evaluates the effects of using many types of reflectors and multi kinds of working fluids on the performance of the parabolic trough collector (PTC), in addition of that study presents the use of PTCs in many applications.
3
Jassim Jaber, Hazim, Qais A. Rishak, and Qahtan A. Abed. "Using PCM, an Experimental Study on Solar Stills Coupled with and without a Parabolic Trough Solar Collector." Basrah journal of engineering science 21, no. 2 (June 1, 2021): 45–52. http://dx.doi.org/10.33971/bjes.21.2.7.
Повний текст джерелаАнотація:
Performance a double slope of the solar still Integrated With or without parabolic trough collector is investigated experimentally. To improve the output of a double slope solar still, a number of initiatives have been undertaken, using wax as a phase change material (PCM) with a parabolic trough collector. A parabolic trough collector (PTC) transfers incident solar energy to the solar still through a water tube connected to a heat exchanger embedded in used microcrystalline wax. Experiments were carried out after orienting the basin to the south and holding the water depth in the basin at 20 mm. According to the results obtained, the solar stills with parabolic trough collector have higher temperatures and productivity than solar stills without parabolic trough collector, as well as the ability to store latent heat energy in solar still, allowing fresh water to condense even after sunset. In addition, the parabolic trough collector with phase change material in the double slope solar improves productivity by 37.3 % and 42 %, respectively.
4
Mohana, N., K. Karunamurthy, and R. Suresh Isravel. "Analysis of outlet temperature of parabolic trough collector solar water heater using machine learning techniques." IOP Conference Series: Earth and Environmental Science 1161, no. 1 (April 1, 2023): 012001. http://dx.doi.org/10.1088/1755-1315/1161/1/012001.
Повний текст джерелаАнотація:
Abstract The green sources of energy are ocean, hydro, solar, tidal, wave, wind, biomass, etc. Among all these wind, solar and hydro are mainly used. Particularly, solar energy has various applications such as atmospheric energy balance studies, solar energy collecting systems, analysis of the thermal load on buildings, etc. Parabolic trough collector (PTC) based solar water heater (SWH) gains a significant role in water heating systems. Parabolic trough collector is a concentrating type collector which collects the solar radiation in copper tube placed in the focal point of the parabolic trough. It also generates a high temperature which is suitable for steam generation. The main goal of this paper is to predict the outlet temperature of parabolic trough collector solar water heater with time and temperature for different days using various machine learning techniques.
5
Settino, Jessica, Vittorio Ferraro, Cristina Carpino, and Valerio Marinelli. "Thermodynamic Analysis of a Parabolic Trough Collector (PTC) operating with gas-phase nanofluids." Journal of Physics: Conference Series 2385, no. 1 (December 1, 2022): 012104. http://dx.doi.org/10.1088/1742-6596/2385/1/012104.
Повний текст джерелаАнотація:
Abstract Parabolic Trough Collectors (PTC) are the most developed and established technology among the concentrated solar power systems. However, the majority of the PTC power plants currently in operation uses synthetic oils or molten salts as heat transfer fluids (HTF), with a limited operating temperature range. To operate at higher temperatures, the use of pressurized gases as working fluid has been recently proposed in several studies. However, in this case a large pumping power is required. In this work, the use of gas-solid suspensions in a commercial PTC has been analyzed. A thermodynamic analysis has been performed to investigate the effect of three different gas-solid suspensions: Argon-Al2O3, Carbon Dioxide-Al2O3 and Air-Al2O3. The performance of these gas-phase nanofluids has been compared to the use of pure gases. Power output, pumping power, outlet fluid temperature and global efficiency of the parabolic trough system have been determined. The analysis shows a substantial decrease of the pumping power. Thanks to this advantage, the use of gas-phase nanofluids in parabolic trough collectors could represent an interesting possibility.
6
Burhan A.S, Andrian Aziz, Dzul Fadhli Aziz, and Muhammad Nur Hidayat. "PARABOLIC TROUGH COLLECTOR CONCENTRATING SOLAR POWER AS STEAM PRODUCER USING SOLAR IRRADIATION OF CEPU, BLORA, CENTRAL JAVA." Scientific Contributions Oil and Gas 41, no. 3 (June 22, 2020): 155–68. http://dx.doi.org/10.29017/scog.41.3.334.
Повний текст джерелаАнотація:
Alternative energy sources has grown lately, especially for solar energy harnessed with Concentrating Solar Power (CSP) to produce steam that will be converted into a certain form of energy. The steam produced can also be used for petroleum industry to reduce the fuel usage in boilers. Daily solar irradiation of 5.18001 5.21909 kWh/m2 received by Cepu, Blora, Central Java, is deemed sufficient for CSP with parabolic trough collector (PTC) as steam producer. This paper describes the designing of the parabolic trough collector CSP, temperature increase gained from PTC, and peak temperature gained from 1 PTC. The initial experiment of PTC in cloudy, sunny, and cloudy-sunny-cloudy weather resulting in water temperature increase gained to be 172oC, 401.1oC, 285.9oC using Cepu District solar irradiation. Further experiments will be done to find out the relationship between temperature over time.
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Marotta, Gianluca, Paola Sansoni, Franco Francini, David Jafrancesco, Maurizio De Lucia, and Daniela Fontani. "Structured Light Profilometry on m-PTC." Energies 13, no. 21 (October 29, 2020): 5671. http://dx.doi.org/10.3390/en13215671.
Повний текст джерелаАнотація:
In concentrating solar systems, it is essential to study the optical losses of the collectors. A fundamental parameter is the intercept factor, namely, the fraction of sunrays reflected by the concentrator that reaches the receiver. Optical profilometry studies the relationship between the collector profile and the intercept factor, which influences the collection efficiency. Profilometric analyses were performed on a micro-parabolic trough collector (m-PTC), with reduced sizes and greater mirror curvature than a usual PTC. The proposed technique projects a luminous pattern (structured light) both on the collector with an opaque covering and on a flat reference plane. Measurement set-up and calibration technique were developed for m-PTC. A program coded in Python analyzed the images and reconstructs the mirror profile. The tilted reference plane was reconstructed using an original geometric model and a calibration procedure. The focal length of each parabolic section was calculated, providing information on surface defects in the mirror. An important parameter obtained was the displacement of the focus of the parabola with respect to the ideal position. Using this value, the intercept factor was estimated to be 0.89. The proposed technique was validated by comparing the results with an independent profilometric study applied to the same m-PTC.
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Korres, Dimitrios N., Evangelos Bellos, Panagiotis Lykas, and Christos Tzivanidis. "An Innovative Parabolic Trough Collector Design with a Twin-Cavity Receiver." Applied Sciences 12, no. 24 (December 7, 2022): 12551. http://dx.doi.org/10.3390/app122412551.
Повний текст джерелаАнотація:
An innovative parabolic trough concentrator coupled to a twin cavity receiver (PTC-TC) in evacuated tube conditions is investigated thermally and optically. The suggested design is compared with a PTC design with a flat receiver (PTC-F) in order to evaluate the efficiency of the proposed configuration. In the very first stages of the study, the optical efficiency was calculated for both collectors, and the optimum design was determined in the PTC-TC case. Then a mass flow rate independency procedure was conducted to ensure accurate results and to make a suitable comparison. The collectors were examined in a wide range of inlet temperatures ranging from 20 °C to 200 °C, and the thermal performance was calculated. Through the comparison process, it was revealed that the proposed collector appears to have higher thermal performance than the typical collector. In particular, there was a mean enhancement of approximately 8%, while the minimum enhancement was found to be greater than 5%. The simulation results regarding both configurations were verified through two models based on theoretical equations. In both geometries, the mean deviations in the verification procedure were lower than 5.6% in both the Darcy friction factor and the Nusselt number. The design and the simulations were conducted with the SolidWorks Flow Simulation tool.
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Said, Sana, Sofiene Mellouli, Talal Alqahtani, Salem Algarni, and Ridha Ajjel. "New Evacuated Tube Solar Collector with Parabolic Trough Collector and Helical Coil Heat Exchanger for Usage in Domestic Water Heating." Sustainability 15, no. 15 (July 25, 2023): 11497. http://dx.doi.org/10.3390/su151511497.
Повний текст джерелаАнотація:
Buildings represent approximately two-thirds of the overall energy needs, mainly due to the growing energy consumption of air conditioning and water heating loads. Hence, it is necessary to minimize energy usage in buildings. Numerous research studies have been carried out on evacuated tube solar collectors, but to our knowledge, no previous study has mentioned the combination of an evacuated tube solar collector with a parabolic trough collector and a helical coil heat exchanger. The objective of this paper is to evaluate the thermal behavior of an innovative evacuated tube solar collector (ETSC) incorporated with a helical coil heat exchanger and equipped with a parabolic trough collector (PTC) used as a domestic water heater. To design the parabolic solar collector, the Parabola Calculator 2.0 software was used, and the Soltrace software was used to determine the optical behavior of a PTC. Moreover, an analytical model was created in order to enhance the performance of the new model of an ETSC by studying the impact of geometric design and functional parameters on the collector’s effectiveness. An assessment of the thermal behavior of the new ETSC was performed. Thus, the proposed analytical model gives the possibility of optimizing ETSCs used as domestic water heaters with lower computational costs. Furthermore, the optimum operational and geometrical parameters of the new ETSC base-helical tube heat exchanger include a higher thermal efficiency of 72%. This finding highlights the potential of the heat exchanger as an excellent component that can be incorporated into ETSCs.
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Aldaher, Abdallah Yousef Mohammad, Salah S. Al-Thyabat, Gangfeng Tan, Muhammad Usman Shoukat, and Ebaa Khaled Mohammed Matar. "Structure of Parabolic Trough Collector Model for Local Heating and Air Conditioning." European Journal of Theoretical and Applied Sciences 1, no. 4 (July 6, 2023): 186–96. http://dx.doi.org/10.59324/ejtas.2023.1(4).20.
Повний текст джерелаАнотація:
Concentrating solar power (CSP) is a type of solar energy that uses mirrors (concentrators) to concentrate sunlight from a large area to a small area where it is absorbed and converted to heat at high temperatures. CSP plants have a big advantage over photovoltaic (PV) power plants because they can use conventional fuels and store thermal energy to make up for the fact that solar energy doesn’t always work. In this paper, a parabolic trough collector (PTC) with the following parameters was designed to investigate the efficiency of a small-scale PTC to heat a synthetic heat transfer fluid that may be used for domestic heating or cooling. PTC 2 m in length, 30 cm rim radius (
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Bellos, Evangelos, and Christos Tzivanidis. "Polynomial Expressions for the Thermal Efficiency of the Parabolic Trough Solar Collector." Applied Sciences 10, no. 19 (October 1, 2020): 6901. http://dx.doi.org/10.3390/app10196901.
Повний текст джерелаАнотація:
The parabolic trough solar collector (PTC) is the most mature solar concentrating technology, and this technology is applied in numerous thermal applications. Usually, the thermal efficiency of the PTC is expressed with the aid of polynomial expressions. However, there is not a universal expression that is applied in all cases with high accuracy. Many studies use expressions with the first-degree polynomial, second-degree, or fourth-degree polynomial expressions. In this direction, this work is a study that investigates different expressions about the thermal efficiency of a PTC with a systematic approach. The LS-2 PTC module is examined with a developed numerical model in the Engineering Equation Solver for different operating temperatures and solar beam irradiation levels. This model is validated using experimental literature data. The found data are approximated with various polynomial expressions with up to six unknown parameters in every case. In every case, the mean absolute percentage error and the R2 are calculated. According to the final results, the use of the third power term leads to the best fitting results, as well as the use of the temperature difference term (ΔΤ), something that is new according to the existing literature. More specifically, the final suggested formula has the following format: “ηcol = a0 + a3∙ΔT3/Gb + b∙ΔΤ”. The results of this work can be used by the scientists for the optimum fitting of the PTC efficiency curves and for applying the best formulas in performance determination studies.
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Siva Reddy, E., R. Meenakshi Reddy, and K. Krishna Reddy. "Experimental Study on Thermal Efficiency of Parabolic Trough Collector (PTC) Using Al2O3/H2O Nanofluid." Applied Mechanics and Materials 787 (August 2015): 192–96. http://dx.doi.org/10.4028/www.scientific.net/amm.787.192.
Повний текст джерелаАнотація:
Dispersing small amounts of solid nano particles into base-fluid has a significant impact on the thermo-physical properties of the base-fluid. These properties are utilized for effective capture and transportation of solar energy. This paper attempts key idea for harvesting solar energy by using alumina nanofluid in concentrating parabolic trough collectors. An experimental study is carried out to investigate the performance of a parabolic trough collector using Al2O3-H2O based nanofluid. Results clearly indicate that at same ambient, inlet temperatures, flow rate, concentration ratio etc. hike in thermal efficiency is around 5-10 % compared to the conventional Parabolic Trough Collector (PTC). Further, the effect of various parameters such as concentration ratio, receiver length, fluid velocity, volume fraction of nano particles has been studied. The different flow rates employed in the experiment are 2 ml/s, 4 ml/s and 6 ml/s. Volumetric concentration of 0.02%, 0.04% and 0.06% has been studied in the experiment. Surfactants are not introduced to avoid bubble formation. Tracking mode of parabolic trough collector is manual. Results also reveal that Al2O3-H2O based nanofluid has higher efficiency at higher flow rates.
13
Mellaikhafi, Abdellah, Amine Tilioua, Mohamed Hajjaj, Abella Bouaaddi, and Choukri Messaoudi. "Investigation of the behavior of a heating system coupled to parabolic trough solar collector system." E3S Web of Conferences 336 (2022): 00009. http://dx.doi.org/10.1051/e3sconf/202233600009.
Повний текст джерелаАнотація:
The objective of this work is to study the thermal behavior of a solar heating system using an active layer, integrated in a wall and supplied with hot water by a parabolic trough solar collector (PTC). The prototype includes a PTC collector with a surface area of 1.8m2, a tank and an active layer integrated in a wall. A complete simulation model using the TRNSYS 16 simulation software has been established. Simulation tests under the climatic conditions of the city of Errachidia located in southeastern Morocco show the temperature variations in the different components of the installation as well as the useful energy gained during the three coldest months (December, January and February). In addition, an evaluation study of the system's performance with effect of different values of the reflectivity of PTC collector mirror was carried out. The results obtained show that the PTC efficiency increased from 0.41 to 0.63 when the reflectivity of the collector mirror increased from 0.6 to 0.9 for the three heating months.
14
Cao, Fei, Lei Wang, and Tianyu Zhu. "Design and Optimization of Elliptical Cavity Tube Receivers in the Parabolic Trough Solar Collector." International Journal of Photoenergy 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/1471594.
Повний текст джерелаАнотація:
The nonfragile cavity receiver is of high significance to the solar parabolic trough collector (PTC). In the present study, light distributions in the cavity under different tracking error angles and PTC configurations are analyzed. A new elliptical cavity geometry is proposed and analyzed. It is obtained from this study that light distribution on the tube receiver is asymmetrical when tracking error occurs. On increasing the tracking error angle, more lights are sheltered by the cavity outer surface. The PTC focal distance has negative correlation with the cavity open length, whereas the PTC concentration ratio has positive correlation with the cavity open length. Increasing the tracking error angle and increasing the PTC focal distance would both decrease the cavity blackness. Introducing a flat plate reflector at the elliptical cavity open inlet can largely increase the cavity darkness.
15
Pavlovic, S., E. Bellos, V. Stefanovic, and C. Tzivanidis. "Optimum geometry of parabolic trough collectors with optical and thermal criteria." International Review of Applied Sciences and Engineering 8, no. 1 (June 2017): 45–50. http://dx.doi.org/10.1556/1848.2017.8.1.7.
Повний текст джерелаАнотація:
The objective of this work is to investigate the impact of the geometric dimensions of parabolic trough collector (PTC) in the optical, energetic and exergetic efficiency. The module of the commercial LS-3 PTC is examined with SOLIDWORKS FLOW SIMULATION in steady-state conditions. Various combinations of reflector widths and receiver diameters are tested. The optical and the thermal performance, as well as the exergetic performance are calculated for all the examined configurations. According to the final results, higher widths demands higher receiver diameter for optimum performance. For inlet temperature equal to 200 °C, the optimum design was find to be 3000 mm width with 42.5 mm receiver diameter, with the focal length to be 1840 mm (this is kept constant in all the cases). The results of this work and the presented methodology can be used as guidelines for the design of optimum PTC in the future.
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Pathak, Kripa Shankar, and Ravindra Mohan. "To Maximize Heating Performance of Solar Parabolic Trough Collector by Geometrical Variation Using CFD Analysis." SMART MOVES JOURNAL IJOSCIENCE 5, no. 2 (February 11, 2019): 16. http://dx.doi.org/10.24113/ijoscience.v5i2.184.
Повний текст джерелаАнотація:
The potential of renewable energy should be investigated. Renewable energy is the energy from natural and unnatural available forms including wind, biomass, solar, and waste heat energy generated through various human activities. Solar energy is an available and clean form of renewable energy used as an alternative to fossil fuel in generating energy. However, the maximum extraction of thermal energy from the sun is most challenging. This study focuses on energy generation using the parabolic trough collector (PTC). This review contains geometrical analysis including the thermal approach of the PTC model, heat transfer, and method of enhancing thermal efficiency on the PTC receiver. So to identify the performance analysis, thermal efficiency, and applications of the solar-powered PTC and the history of PTC evolution. The PTC applications include desalination process, air heating system, power plants, refrigeration, and industrial heating purposes.
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Shirole, Ashutosh, Mahesh Wagh, and Vivek Kulkarni. "Thermal Performance Comparison of Parabolic Trough Collector (PTC) Using Various Nanofluids." International Journal of Renewable Energy Development 10, no. 4 (June 27, 2021): 875–89. http://dx.doi.org/10.14710/ijred.2021.33801.
Повний текст джерелаАнотація:
The objective of this paper is to investigate the theoretical performance of Parabolic Trough Collector (PTC) using various nanofluids. The theoretical performances are calculated for Al2O3, graphite, magnetite, SWCNH, CuO, SiO2, MWCNT, TiO2, Fe2O3, and ZnO in water nanofluids. The heat transfer equations, thermodynamic properties of nanofluid and pumping power are utilised for the development of novel thermal model. The theoretical thermal efficiency of the PTC is calculated, and the economic viability of the technology is predicted for a range of nanofluid concentration. The results showed that the thermal conductivity increases with the concentration of nanoparticles in the base fluid. Magnetite nanofluid showed the highest thermal efficiency, followed by CuO, MWCNT, ZnO, SWCNH, TiO2, Fe2O3, Al2O3, graphite, and SiO2, respectively. The study reveals that MWCNT at 0.4% concentration is the best-suited nanofluid considering thermal gain and pumping power. Most of the nanofluids achieved optimum efficiency at 0.4% concentration. The influence of mass flow rate on thermal efficiency is evaluated. When the mass flow rate increased from 70 Kg/hr to 90Kg/hr, a 10%-20% efficiency increase is observed. Dispersing nanofluids reduces the levelized cost of energy of large-scale power plants. These findings add to the knowledge of the scientific community aimed explicitly at solar thermal energy technology. The report can also be used as a base to pursue solar thermal projects on an economic basis.
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Zhang, Haofei, Bo Lei, Tao Yu, and Zhida Zhao. "Form and Operation Mode Analysis of a Novel Solar-Driven Cogeneration System with Various Collector Types." International Journal of Photoenergy 2019 (April 11, 2019): 1–12. http://dx.doi.org/10.1155/2019/5329086.
Повний текст джерелаАнотація:
In this study, the form and operation modes of a novel solar-driven cogeneration system consisted of various solar collectors (flat plat collectors (FPC), evacuated tube collectors (ETC), and parabolic trough collectors (PTC)) and ORC (organic Rankine cycle) based on building heating load are analyzed. This paper mainly obtains the fitting formula of thermal efficiency of the ORC power generation device and determines the form and operation mode of the cogeneration system. The form is the same, but the operation modes are different for PTC and FPC or ETC. There are six operating modes, respectively, based on the size relationship between the heating load of buildings and the effective heat collection of the solar collector subsystem when the solar collectors are PTC or FPC and ETC.
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Hassanein, A. A. M., and Ling Qiu. "Design of Parabolic Trough Solar Collector (PTC) and Numerical Simulation for Improving the Efficiency." Applied Mechanics and Materials 291-294 (February 2013): 53–60. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.53.
Повний текст джерелаАнотація:
This research focus on two PTC designs, one in Runzhen-school, China (latitude 36.5°N, longitude110°E and 386m altitude) and the second PTC with tracking system. The study showed that, using one tube concentrate in the focal point with fixed PTC gives lower efficiency compared with using two vacuum tubes, as the variation of solar altitude angle is large. So using two focal points results a better heating. The new system uses PTC with sun tracking system to maximize solar radiation absorptions, that leading to increase the hot water temperature and has higher system efficiency. In addition, this system supplies two batteries by electricity coming from two solar-cells and it’s produced for the tracking system working during hours of sunlight. The photovoltaic electricity provided is stored in batteries and then used for tracking motion. The tracing motion receives orders from a control unit, which works at different voltage in two solar cells.
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Kannaiyan, Surender, and Neeraj Dhanraj Bokde. "Performance of Parabolic Trough Collector with Different Heat Transfer Fluids and Control Operation." Energies 15, no. 20 (October 14, 2022): 7572. http://dx.doi.org/10.3390/en15207572.
Повний текст джерелаАнотація:
Electricity generation from solar energy has become very desirable because it is abundantly available and eco-friendly. Mathematical modeling of various components of a Solar Thermal Power plant (STP) is warranted to predict the optimal and efficient operation of the plant. The efficiency and reliability of STPs are maximized based on different operating strategies. Opting for proper Heat Transfer Fluid (HTF), which is proposed in this paper, helps in reducing operating complexity and lowering procurement cost. The Parabolic Trough Collector (PTC) is the heart of STP, where proper focusing of PTC towards solar radiation is the primary task to maximize the outlet temperature of HTF. This maximum temperature plays a major factor due to diurnal solar radiation variation, and its disturbance nature, with the frequent startup and shutdown of STP, is avoided. In this paper, the PTC component is modeled from the first principle, and, with different HTF, the performance of PTC with constant and quadratic solar disturbances is analyzed along with classical control system designs. Through this, the operator will be able to choose proper HTF and resize the plant components depending on plant location and weather conditions. Furthermore, the thermal energy is collected for therminol oil, molten salt, and water; and its performance with different inputs of solar radiation is analyzed along with closed-loop controllers. Thermal energy extracted by therminol oil, molten salt, and water with constant solar radiation results in 81.7%,73.7% and 18.7%, respectively.
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Mathkor, Ratha Z., Brian Agnew, Mohammed A. Al-Weshahi, and Saleh Etaig. "Thermal Analysis of a Solar Powered ORC in Libya." Applied Mechanics and Materials 789-790 (September 2015): 391–97. http://dx.doi.org/10.4028/www.scientific.net/amm.789-790.391.
Повний текст джерелаАнотація:
The paper presents a study of a thermal assessment of an Organic Rankine Cycle (ORC) energized by heat absorbed from a parabolic trough collector (PTC) located in Derna, Libya. Both the ORC and PTC are modeled using the IPSEpro software. The simulation results are used to evaluate the system performance using energy and exergy analysis. The study showed the PTC collector was the main contributor of the energy and exergy losses within the PTC system and the evaporator within in the ORC. At this specific weather conditions, the ORC was able to produce about 3 MW electrical powers from the powered PTC heat. Moreover, exergy efficiency of the PTC was 47.7 %, the heat engine was 23.3 % and for the overall system (PTC and ORC) was 11.1 %.
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Fadhel, Hawraa, Qahtan A. Abed, and Dhafer M. Hachim. "An Experimental Work on the Performance of Single Solar Still with Parabolic Trough Collector in Hot Climate Conditions." International Journal of Heat and Technology 39, no. 5 (October 31, 2021): 1627–33. http://dx.doi.org/10.18280/ijht.390526.
Повний текст джерелаАнотація:
This study investigated the production of single slope solar still and the influence of combining with a parabolic trough collector. The effect of the different working fluid types on freshwater productivity, outlet working fluid temperature, heat gain, and thermal efficiency has been studied under the weather conditions of south city of Iraq/ Najaf (32° 1' N / 44° 1' E). The first type was water and the second type is nanofluid. The results of the comparison showed when using water as a working fluid flowing inside the receiving tube for different days; the highest temperatures were obtained at 12:00 pm, and the average productivity of distilled water was obtained in May and June 2021 were 4.5358 and 6.733 kg/m2/day respectively. While when using the nanofluid as a working fluid flowing inside the Parabolic Trough Collector (PTC) receiver tube, the outlet temperatures were rising for the same comparison days with an increase in the productivity of distilled water. Where the freshwater productivity during the day was 8.745328 kg /m2 /day as, and it was 9.018119 kg/m2/day during the other day. A productivity analysis was carried out for two different working fluid types (Water and nanofluid instead of water) as a fluid running inside the receiving tube of PTC. The freshwater produced from PTC (with nanofluid) was a 42.2% improvement in productivity compared with conventional PTC.
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Bandala, Erick R., and Claudio Estrada. "Comparison of Solar Collection Geometries for Application to Photocatalytic Degradation of Organic Contaminants." Journal of Solar Energy Engineering 129, no. 1 (November 17, 2005): 22–26. http://dx.doi.org/10.1115/1.2390986.
Повний текст джерелаАнотація:
A comparative study between four different solar collectors was carried out using oxalic acid and the pesticide carbaryl as model contaminants. The comparison was performed by means of a figure-of-merit developed for solar driven Advanced Oxidation Technology systems by the International Union of Pure and Applied Chemistry (IUPAC) for standardization purposes. It was found that there is a relationship between the photocatalyst concentration and the overall solar collector performance. Compound parabolic concentrator was the geometry with the highest turnover rate in the photocatalytic process of oxalic acid, followed by the V trough collector, the parabolic concentrator, and, finally, the tubular collector. When a comparative analysis was carried out using the figure of merit (collector area per order, ACO), the parabolic trough concentrator (PTC) showed the highest efficiency (lower ACO values) at low photocatalyst loads. The V trough collector and the compound parabolic collector showed similar ACO values, which decreased as the photocatalyst concentration increased. The tubular collector was the worst in all catalyst concentration ranges, with the higher collection surface by the order of oxalic acid. Photocatalytic degradation of the carbamic pesticide was tested using the same experimental arrangement used for oxalic acid. In this case, the use of the figure-of-merit allowed us to observe the same trend as that displayed for oxalic acid, but with slightly higher ACO values. Results of this work demonstrate that a comparison between different reactor geometries for photocatalytic processes is viable using this figure-of-merit approach and that the generated results can be useful in the standardization of a methodology for solar driven processes comparison and provide important data for the scaling up of the process.
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Chaudhary, Ghulam Qadar, Rubeena Kousar, Muzaffar Ali, Muhammad Amar, Khuram Pervez Amber, Shabaz Khan Lodhi, Muhammad Rameez ud Din, and Allah Ditta. "Small-Sized Parabolic Trough Collector System for Solar Dehumidification Application: Design, Development, and Potential Assessment." International Journal of Photoenergy 2018 (February 21, 2018): 1–12. http://dx.doi.org/10.1155/2018/5759034.
Повний текст джерелаАнотація:
The current study presents a numerical and real-time performance analysis of a parabolic trough collector (PTC) system designed for solar air-conditioning applications. Initially, a thermodynamic model of PTC is developed using engineering equation solver (EES) having a capacity of around 3 kW. Then, an experimental PTC system setup is established with a concentration ratio of 9.93 using evacuated tube receivers. The experimental study is conducted under the climate of Taxila, Pakistan in accordance with ASHRAE 93-1986 standard. Furthermore, PTC system is integrated with a solid desiccant dehumidifier (SDD) to study the effect of various operating parameters such as direct solar radiation and inlet fluid temperature and its impact on dehumidification share. The experimental maximum temperature gain is around 5.2°C, with the peak efficiency of 62% on a sunny day. Similarly, maximum thermal energy gain on sunny and cloudy days is 3.07 kW and 2.33 kW, respectively. Afterwards, same comprehensive EES model of PTC with some modifications is used for annual transient analysis in TRNSYS for five different climates of Pakistan. Quetta revealed peak solar insolation of 656 W/m2 and peak thermal energy 1139 MJ with 46% efficiency. The comparison shows good agreement between simulated and experimental results with root mean square error of around 9%.
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Novas, Nuria, Aránzazu Fernández-García, and Francisco Manzano-Agugliaro. "A Simplified Method to Avoid Shadows at Parabolic-Trough Solar Collectors Facilities." Symmetry 12, no. 2 (February 13, 2020): 278. http://dx.doi.org/10.3390/sym12020278.
Повний текст джерелаАнотація:
Renewable energy today is no longer just an affordable alternative, but a requirement for mitigating global environmental problems such as climate change. Among renewable energies, the use of solar energy is one of the most widespread. Concentrating Solar Power (CSP) systems, however, is not yet fully widespread despite having demonstrated great efficiency, mainly thanks to parabolic-trough collector (PTC) technology, both on a large scale and on a small scale for heating water in industry. One of the main drawbacks to this energy solution is the large size of the facilities. For this purpose, several models have been developed to avoid shadowing between the PTC lines as much as possible. In this study, the classic shadowing models between the PTC rows are reviewed. One of the major challenges is that they are studied geometrically as a fixed installation, while they are moving facilities, as they have a tracking movement of the sun. In this work, a new model is proposed to avoid shadowing by taking into account the movement of the facilities depending on their latitude. Secondly, the model is tested to an existing facility as a real case study located in southern Spain. The model is applied to the main existing installations in the northern hemisphere, thus showing the usefulness of the model for any PTC installation in the world. The shadow projected by a standard, the PTC (S) has been obtained by means of a polynomial approximation as a function of the latitude (Lat) given by S = 0.001 − Lat2 + 0.0121 − Lat + 10.9 with R2 of 99.8%. Finally, the model has been simplified to obtain in the standard case the shadows in the running time of a PTC facility.
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Bouali, Belkacem, and Hanane-Maria Regue. "Contribution to the Parametric Study of the Performance of A Parabolic Trough Collector." E3S Web of Conferences 321 (2021): 02016. http://dx.doi.org/10.1051/e3sconf/202132102016.
Повний текст джерелаАнотація:
This paper presents an analysis of the performance of a parabolic trough collector (PTC) according to some key operating parameters. The effects of the secondary reflector, the length and thickness of the absorber tube (receiver tube) and the flow rate of the heat transfer fluid (HTF) are investigated. The main objective is to determine an optimal operation, which improves the performance of a traditional PTC. The target variables are the temperature at the outlet of the tube, the amount of energy collected by the HTF and the efficiency of the system. The solar flux data concern the city of LAGHOUAT located in the south of Algeria. Four days in different seasons are considered. The optical analysis of the system is performed by using the open source SolTrace code. The output of this analysis is used as a boundary condition for the CFD solver. The conjugate heat transfer and the fluid flow through the absorber tube are simulated by using ANSYS-CFX solver. Water is considered as heat transfer fluids. The obtained results show that the use of a curved secondary reflector significantly improves the performance of the traditional PTC. As the thickness of the tube increases, the heat storage in the material increases, which increases the temperature at the exit of the tube and therefore the efficiency of the system. However, the length of the tube depends on the mass flow of the HTF and vice versa. To keep the efficiency constant by choosing another length, it is necessary to choose a mass flow rate proportional to the flow rate corresponding to the initial length.
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Cetina Quiñones, Armando Jesus, Ali Bassam, Gandhi Samuel Hernandez Chan, Jose Agustin Hernandez Benitez, Ignacio Hernández Reyes, and David Lugo Chávez. "Thermal modeling of a parabolic trough solar collector using finite element method." Thermal Science and Engineering 5, no. 2 (November 16, 2022): 60. http://dx.doi.org/10.24294/tse.v5i2.1539.
Повний текст джерелаАнотація:
The purpose of this work is to present the model of a Parabolic Trough Solar Collector (PTC) using the Finite Element Method to predict the thermal behavior of the working fluid along the collector receiver tube. The thermal efficiency is estimated based on the governing equations involved in the heat transfer processes. To validate the model results, a thermal simulation of the fluid was performed using Solidworks software. The maximum error obtained from the comparison of the modeling with the simulation was 7.6% at a flow rate of 1 l/min. According to the results obtained from the statistical errors, the method can effectively predict the fluid temperature at high flow rates. The developed model can be useful as a design tool, in the optimization of the time spent in the simulations generated by the software and in the minimization of the manufacturing costs related to Parabolic Trough Solar Collectors.
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Guerraiche, D., K. Guerraiche, Z. Driss, A. Chibani, S. Merouani, and C. Bougriou. "Heat Transfer Enhancement in a Receiver Tube of Solar Collector Using Various Materials and Nanofluids." Engineering, Technology & Applied Science Research 12, no. 5 (October 2, 2022): 9282–94. http://dx.doi.org/10.48084/etasr.5214.
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The solar flux distribution on the Parabolic Trough Collector (PTC) absorber tube is extremely non-uniform, which causes non-uniform temperature distribution outside the absorber tube. Therefore, it generates high thermal stress which causes creep and fatigue damage. This presents a challenge to the efficiency and reliability of parabolic trough receivers. To override this problem, we have to homogenize the heat flux distribution and enhance the heat transfer in the receiver’s absorber tube to improve the performance of the PTC. In this work, 3D thermal and thermal stress analyses of PTC receiver performance were investigated with a combination of Monte Carlo Ray-Trace (MCRT), Computational Fluid Dynamics (CFD) analysis, and thermal stress analysis using the static structural module of ANSYS. At first, we studied the effect of the receiver tube material (aluminium, copper, and stainless steel) on heat transfer. The temperature gradients and the thermal stresses were compared. Second, we studied the effect of the addition of nanoparticles on the working Heat Transfer Fluid (HTF), employing an Al2O3-H2O based nanofluid at various volume concentrations. To improve the thermal performance of the PTC, a nanoparticle volume concentration ratio of 1%–6% is required. The results show that the temperature gradients and thermal stresses of stainless steel are significantly higher than those of aluminium and copper. From the standpoint of thermal stress, copper is recommended as the tube receiver material. Using Al2O3 in water as an HTF increases the average output temperature by 2%, 6%, and 10% under volume concentrations of 0%, 2%, and 6% respectively. The study concluded that the thermal efficiency increases from 3% to 14% for nanoparticle volume fractions ranging from 2% to 6%.
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Akram, Shakeel, Farhan Hameed Malik, Rui Jin Liao, Bin Liu, and Tariq Nazir. "Microcontroller Based Single Axis Intelligent Control Sun Tracker for Parabolic Trough Collectors." Advanced Materials Research 562-564 (August 2012): 1772–75. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.1772.
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Due to the complex design and high costs of production, solar thermal systems have fallen behind in the world of alternative energy systems. Different mechanisms are applied to increase the efficiency of the solar collectors and to reduce the cost. Solar tracking system is the most appropriate technology to increase the efficiency of solar collectors as well as solar power plants by tracking the sun timely. In order to maximize the efficiency of collectors, one needs to keep the reflecting surface of parabolic trough collectors perpendicular to the sun rays. For this purpose microcontroller based real time sun tracker is designed which is controlled by an intelligent algorithm using shadow technique. The aim of the research project is to test the solar-to-thermal energy efficiency by tracking parabolic trough collector (PTC). The energy efficiency is determined by measuring the temperature rise of working fluid as it flows through the receiver of the collector when it is properly focused. The design tracker is also simulated to check its accuracy. The main purpose to design this embedded system is to increase the efficiency and reliability of solar plants by reducing size, complexity and cost of product.
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Wang, Qiliang, Hongxing Yang, Gang Pei, Honglun Yang, Jingyu Cao, and Mingke Hu. "Assessment of Performance Enhancement Potential of a High-Temperature Parabolic Trough Collector System Combining the Optimized IR-Reflectors." Applied Sciences 10, no. 11 (May 28, 2020): 3744. http://dx.doi.org/10.3390/app10113744.
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Heat collecting elements (HCEs) are the core components in the parabolic trough collector (PTC) system because photothermal conversion of the whole system occurs in the HCEs. However, considerable heat loss from the HCEs at high operating temperature exerts seriously negative impact on the photothermal conversion efficiency of the PTC system and subsequent application systems. To effectively reduce the heat loss and thus enhance the overall performance of the PTC system, in our previous work, we proposed three kinds of novel HCEs by partially depositing different IR-reflector coatings on the inner and outer surfaces of the glass envelope. The infrared (IR)-reflector of actual transparent conductive oxide (TCO) film, IR-reflector with a fixed cutoff wavelength of 2.5 μm, and the IR-reflector with optimal cutoff wavelength showed extremely effective roles in the reduction of heat loss in HCEs. In this paper, the comprehensive energy and exergy performances of these three novel HCEs in a real 72 m small-scale PTC system are further investigated by the mathematical models established. Additionally, the comparisons among overall performances of the proposed HCEs under different direct solar irradiances are also carried out. The results show that the simulated data yields good consistence with the experimental results, and that all three of the novel HCEs achieve superior overall performance compared with the conventional HCEs. The PTC system installing the novel HCEs with the IR-reflector coating which possesses the optimal cutoff wavelength has the best energetic and exergetic efficiencies, which are significantly improved by 25.2% and 28.1% compared with the conventional HCEs at the solar irradiance of 800 W/m2 and inlet temperature of 580 °C. Moreover, the proposed novel HCEs have a much superior performance at lower solar irradiance. The performance-enhanced PTC system will play a significantly positive role in the performance improvement of the heating and cooling of buildings in the future.
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Al-Oran, O., and F. Lezsovits. "Recent experimental enhancement techniques applied in the receiver part of the parabolic trough collector – A review." International Review of Applied Sciences and Engineering 11, no. 3 (November 12, 2020): 209–19. http://dx.doi.org/10.1556/1848.2020.00055.
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AbstractRecently, the thermal performance of the parabolic trough collector (PTC), augmented to be more applicable and efficient, received intensive research. These studies aimed to improve heat transfer in the receiver part, in order to decrease the heat loss, and enhance the heat transfer to the thermal fluid. Many previous review papers focused on the numerical sides rather than the experimental side. Several research papers recommended doing more research in the experimental field; in order to decrease the gap between the numerical and experimental results, as well as increase the confidence level of what has been done in the theoretical field researches. Regarding the recommendations of the recent papers to decrease the gap between numerical and experimental aspects, this review paper focused on the recent experimental research related to thermal enhancement performance in the receiver part of the parabolic solar collector. In this research, different categories of the enhancement methods are discussed in detail through this review, namely nanofluids, surface modifications, and inserts models or the two categories combined together. We discussed these categories for different parabolic troughs considering only the recent experimental research between the period from 2014 up to 2019. Some parameters were discussed, such as the main dimensions of the examined receiver and parabolic collector. Moreover, types of nanoparticle specifications and preparation methods with different base fluids were highlighted. In addition, we discussed different aspects of using inserts models and inlet and outlet surface modification methods. Finally, the main thermal efficiency and thermal performance enhancement results for each work were presented.
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Zima, Wiesław, Artur Cebula, and Piotr Cisek. "Mathematical Model of a Sun-Tracked Parabolic Trough Collector and Its Verification." Energies 13, no. 16 (August 12, 2020): 4168. http://dx.doi.org/10.3390/en13164168.
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The paper presents a one-dimensional distributed parameter model for simulating the transient-state operation of a parabolic trough collector (PTC). The analyzed solar collector has a module design and is equipped with a two-axis sun-tracking system to increase the solar energy yield. The single module is composed of an evacuated tube and a set of parabolic mirrors acting as reflectors. In each of the collector tubes, two aluminum U-tubes are installed, enabling heat intake by the solar fluid. The collector is intended for household applications, as well as other medium thermal energy demand uses. During the numerical model development, appropriate energy balance differential equations are formulated for the collector individual components. The equations are solved using different schemes. As a result, a time- and space-dependent temperature series for each of the collector components and the working fluid are obtained. To select an appropriate time and spatial steps for the developed model and to verify the reliability of the results received, the collector model is also implemented in ANSYS Fluent. The results of the one-dimensional model calculations and comparisons carried out in ANSYS demonstrate considerable agreement. In particular, the values of the fluid temperature at the collector outlet, calculated using the model developed, show high consistency with the ANSYS Fluent results. Furthermore, a preliminary experimental verification of the proposed model is carried out on a test stand currently under construction. The computed and measured temperature course of the fluid at the collector outlet is compared. In this case, the results are also satisfactory.
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Nahar, Afroza, M.K. Islam,, and Md. Hasanuzzaman. "Experimental Performance Investigation of a Nanofluid Based Parabolic Trough Concentrator in Malaysia." AIUB Journal of Science and Engineering (AJSE) 21, no. 3 (December 31, 2022): 152–58. http://dx.doi.org/10.53799/ajse.v21i3.437.
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Abstract— Concentrating solar energy system is a potential solar thermal technology, wherein parabolic trough concentrators (PTC) are becoming growingly popular. In this research, both analytical and experiment analyses have been done. The experiment has compared with analytical results. to examine the effect of different operating parameters. Water and water-carbon nanotube (w-CNT) are used to explore the performance of PTC system. Optimum receiver diameter is found 51.80 mm for the maximum efficiency of the collector. During optimization, mass flow rate and concentration ratio are found to be influencing on the thermal efficiency and heat removal factor. Investigations show improvement in heat transfer for added nanoparticles. Heat transfer rate is better in laminar flow than in turbulent flow. After analytical analyses, an experiment has been done using water and carbon nanotube and compared with analytical results. Results show that for every 1oC increase in outlet temperature heat gain and thermal efficiency with water increase at the rate of 0.02 kJ/s and 1.6% respectively. On the other hand, for w-CNT as HTF, for every 100 W/m2 increase in irradiance, heat gain augments at a rate of 0.23 kJ/s and thermal efficiency upsurges by around 7%. Flow rate of working fluids and solar irradiance are found to have respective negative and positive impact on thermal efficiency of the parabolic trough collector.
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Geehan, Genevieve, Ritika Ritika, and Coen Winchester. "Impact of Nanofluids and Specific Frequency Absorbers in Parabolic Trough Collector Solar Furnaces." PAM Review Energy Science & Technology 5 (May 31, 2018): 89–103. http://dx.doi.org/10.5130/pamr.v5i0.1502.
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This meta-study aims to identify methods of optimising the efficiency of upcoming parabolic trough collector (PTC) solar furnace technology by analysing thermodynamic properties of both solar absorbers: SiC, Pyromark 2500, Polychromic Al-AlN and C54-TiSi2 nanoparticles; and heat transfer nanofluids: SiO2, TiO2, Al2O3, Cu and Al2O3-Cu with a 50:50 ratio. The thermodynamic properties investigated are energy absorbance and emittance, melting point, thermal conductivity and viscosity. Our study revealed that the optimal transfer fluid is the hybrid nanofluid Al2O3-Cu with a 50:50 ratio and a 1-2% volume fraction in an ethylene glycol base. The optimal solar absorber for use in combination with this nanofluid was found to be polychromic Al-AlN cerment absorber.
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Gupta, Prof Pravin, Himanshu Wakodikar, Prathmesh Dhanaskar, Vedpraksh Kashte, Chetan Dongare, and Sandip Bhagat. "A Review of Parabolic Trough Collector Assisted with Mirror for low temperature Applications." International Journal for Research in Applied Science and Engineering Technology 10, no. 10 (October 31, 2022): 100–103. http://dx.doi.org/10.22214/ijraset.2022.46958.
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Abstract: The global energy demand is going to increase by over 60% in the upcoming decades. Thus, the alternative form of energy should be investigated. The only energy preferable will be a renewable form of energy which includes wind, solar, biomass, and waste generated through human activities. The most useful alternative to fossil fuels in generating clean energy is solar energy. However, the extraction of maximum energy from the sun is quite difficult. This paper includes a comprehensive review of simple parabolic trough collectors along with geometrical analysis, thermal efficiency, and applications. The applications of PTC include water desalination, water heating, increasing the performance that can be utilized for steam generation, etc.
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Remlaoui, Ahmed, and M. Benyoucef, D. Assi, D. Nehari . "A TRNSYS dynamic simulation model for a parabolic trough solar thermal power plant." International Journal of Energetica 4, no. 2 (January 1, 2020): 36. http://dx.doi.org/10.47238/ijeca.v4i2.106.
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This paper presents a validated TRNSYS model for a thermodynamic plant with parabolic trough solar thermal power (PT). The system consist of trough solar collector (PTC) as well as auxiliary components.. The simulation of the system has been done during the day (01/01) under the meteorological conditions of Ain Témouchent city (Algeria). The model compared the energy performance of the systems: case (1) - Rankine cycle facility with solar field and case (2)- Rankine cycle facility without solar field. The results showed that the present model has a good agreement with the experimental data of the literature. In case (1), PTC fluid outlet temperature reach the maximum value 330 ° C, Work of the steam turbine increase from the 9hr to reach its maximum value 856 KJ/Kg at 13 hr. In case (2), the maximum value of the power remains constant from the beginning of the simulation to 1hr00. Since the flow of fuel (gas natural) consumed does not change throughout the operating period.
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Amin, Muhammad, Hamdani Umar, Fazri Amir, Suma Fachruri Ginting, Putu Brahmanda Sudarsana, and Wayan Nata Septiadi. "Experimental Study of a Tubular Solar Distillation System with Heat Exchanger Using a Parabolic Trough Collector." Sustainability 14, no. 21 (October 25, 2022): 13831. http://dx.doi.org/10.3390/su142113831.
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One way to overcome the scarcity of clean water through sustainable approach is by utilizing a solar distillation system. This easy-to-use technology is adopting tubular solar distillation. The three main components, which are the most essential for producing the amount of permeate, are the solar collector, tubular and heat exchanger (HE). This study aims to determine the performance of a tubular solar distillation device equipped with HE using a parabolic trough collector (PTC). The PTC has an area of 5.1 m2 covered with a solar reflective chrome film. Aluminum tubular acts as the feedwater heater. The HE is placed inside the tubular, which acts as a coolant to convert the steam phase into freshwater/permeate and as a feedwater heater to flow into the tubular. In the present study, several parameters were tested: comprise temperature, solar radiation, pressure, humidity, mass flow rate, permeate productivity and efficiency. This study demonstrated the production of a sufficient amount of permeate, which was 5.32 L for 6 h. The efficiency of this device yielded a peak of 48.2% during solar radiation of 813 W/m2 in an average ambient temperature of 32 °C, with an overall average of 44.59%.
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Kasaeian, Ab, Reza Daneshazarian, Fathollah Pourfayaz, Sahar Babaei, Mojgan Sheikhpour, and Shima Nakhjavani. "Evaluation of MWCNT/ethylene glycol nanofluid flow in a parabolic trough collector with glass-glass absorber tube." International Journal of Numerical Methods for Heat & Fluid Flow 30, no. 1 (July 29, 2019): 176–205. http://dx.doi.org/10.1108/hff-11-2018-0693.
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Purpose Because of its increased absorptance in fluid and reduced heat loss, direct absorption nanofluid (DANF) is receiving intense interest as an efficient way to harvest solar energy. This work aims to investigate, for the first time, the application of DANF in parabolic trough collectors (PTC), a promising collector for solar thermal systems. Design/methodology/approach A representative flow and heat transfer study of different fluids in a straight tube is conducted, and the basic energy equation and radiative transfer equations are numerically solved to obtain the fluid temperature distribution and energy conversion efficiency. Ethylene glycol (EG) and different concentrations of (i.e., 0.1-0.6 per cent) multi-wall carbon nanotubes (MWCNT) in EG are used as sample fluids. Four cases are studied for a traditional PTC (i.e., using metal tube) and a direct absorption PTC (i.e., using transparent tube) including a bare tube, a tube with an air-filled glass envelope and a tube with vacuumed glass envelop. The numerical results are verified by an experimental study using a copper-glass absorber tube, which reveals the good potential of DANFs. Findings Compared with a conventional PTC, using DANF shows an increase of 8.6 per cent and 6.5 K, respectively, in thermal efficiency and outlet temperature difference at a volume fraction (0.5 per cent) of nanoparticles. The results also show that the improvement in solar efficiency increases with increasing particle concentrations, and the vacuum insulated case has the highest efficiency. Originality/value In all previous studies, an important section was missing as the effect of photons on the direct solar absorption trough collector, which is considered in this study. This paper proposes a new concept of using direct solar absorption nanofluids for concentrated solar collectors and analyzes the performance of both absorptance and transmittance efficiency considerations. To reveal the potential of the new concept, an analytical model based on energy balance is developed, and two case studies are performed.
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Galindo Luna, Yuridiana, Wilfrido Gómez Franco, Ulises Dehesa Carrasco, Rosenberg Romero Domínguez, and José Jiménez García. "Integration of the Experimental Results of a Parabolic Trough Collector (PTC) Solar Plant to an Absorption Air-Conditioning System." Applied Sciences 8, no. 11 (November 5, 2018): 2163. http://dx.doi.org/10.3390/app8112163.
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The present study reports the experimental results of a parabolic trough collector field and an absorption cooling system with a nominal capacity of 5 kW, which operates with the ammonia-lithium nitrate mixture. The parabolic trough collectors’ field consists of 15 collectors that are made of aluminum plate in the reflector surface and cooper in the absorber tube, with a total area of 38.4 m2. The absorption cooling system consists of 5 plate heat exchangers working as the main components. Parametric analyses were carried out to evaluate the performance of both systems under different operating conditions, in independent way. The results showed that the solar collectors’ field can provide up to 6.5 kW of useful heat to the absorption cooling system at temperatures up to 105 °C with thermal efficiencies up to 19.8% and exergy efficiencies up to 14.93, while the cooling system operated at generation temperatures from 85–95 °C and condensation temperatures between 20 and 28 °C, achieving external coefficients of performance up to 0.56, cooling temperatures as low as 6 °C, and exergy efficiencies up to 0.13. The highest value for the solar coefficient of performance reached 0.07.
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Al-Falahi, Adil, Falah Alobaid, and Bernd Epple. "Design and Thermo-Economic Comparisons of an Absorption Air Conditioning System Based on Parabolic Trough and Evacuated Tube Solar Collectors." Energies 13, no. 12 (June 19, 2020): 3198. http://dx.doi.org/10.3390/en13123198.
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Solar absorption cycles for air conditioning systems have recently attracted much attention. They have some important advantages that aid in reducing greenhouse gas emissions. In this work, design and thermo-economic analyses are presented in order to compare between two different collector types (parabolic trough and evacuated tube) by water–lithium bromide absorption systems, and to select the best operating conditions. Generally, the system consists of three major parts. The first part is the solar field for thermal power conversion. The second part is the intermediate cycle, which contains a flashing tank and pumping system. The third part is the water lithium bromide absorption chiller. A case study for a sports arena with 700–800 kW total cooling load is also presented. Results reveal that a parabolic trough collector combined with H2O–LiBr (PTC/H2O–LiBr) gives lower design aspects and minimum rates of hourly costs (USD 5.2/h), while ETC/H2O–LiBr configuration give USD 5.6/h. The H2O–LiBr thermo-economic product cost is USD 0.14/GJ. The cycle coefficient of performance COP was in the range of 0.5 to 0.9.
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Zaboli, Mohammad, Seyed Soheil Mousavi Ajarostaghi, Seyfolah Saedodin, and Mohsen Saffari Pour. "Thermal Performance Enhancement Using Absorber Tube with Inner Helical Axial Fins in a Parabolic Trough Solar Collector." Applied Sciences 11, no. 16 (August 12, 2021): 7423. http://dx.doi.org/10.3390/app11167423.
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In the present work, a parabolic trough solar (PTC) collector with inner helical axial fins as swirl generator or turbulator is considered and analyzed numerically. The three-dimensional numerical simulations have been done by finite volume method (FVM) using a commercial CFD code, ANSYS FLUENT 18.2. The spatial discretization of mass, momentum, energy equations, and turbulence kinetic energy has been obtained by a second-order upwind scheme. To compute gradients, Green-Gauss cell-based method has been employed. This work consists of two sections where, first, four various geometries are appraised, and in the following, the selected schematic of the collector from the previous part is selected, and four various pitches of inner helical fins including 250, 500, 750 and 1000 mm are studied. All the numerical results are obtained by utilizing the FVM. Results show that the thermal performance improvement by 23.1% could be achieved by using one of the proposed innovative parabolic trough solar collectors compare to the simple one. Additionally, the minimum and maximum thermal performance improvement (compare to the case without fins) belong to the case with P = 250 mm by 14.1% and, to the case with P = 1000 mm by 21.53%, respectively.
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Malato, S., J. Blanco, C. Richter, D. Curcó, and J. Giménez. "Low-concentrating CPC collectors for photocatalytic water detoxification: comparison with a medium concentrating solar collector." Water Science and Technology 35, no. 4 (February 1, 1997): 157–64. http://dx.doi.org/10.2166/wst.1997.0109.
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The photocatalytic oxidation of 2,4-Dichlorophenol (DCP), using TiO2 suspensions under solar radiation, has been studied at pilot-plant scale at the Plataforma Solar de Almería (PSA). Two different reactor designs were tested: a medium concentrating radiation system called a Parabolic-Trough-Collector Reactor, PTCR, equipped with two motors (azimuth and elevation) to adjust the position of the module perpendicular to the sun, and a low-concentrating radiation system, the Compound-Parabolic-Concentrator Reactor, CPCR, facing south and inclined 37 degrees. Substrates were dissolved in water to required mg L−1 levels in a reservoir tank. In both cases, 0.2 g L−1 of the suspended TiO2 catalyst was used in a 250 L solution of the contaminant, which was recirculated through the photoreactors using a centrifugal pump and an intermediate reservoir tank. The advantages and disadvantages of the two types of photoreactors in DCP oxidation are compared and discussed. The strong potential of photocatalytic peroxydisulphate-assisted degradation in high DCP concentrations was demonstrated in both systems, and chemical actinometry (the decomposition reaction of oxalic acid by radiated uranyl salts) in the CPC reactor is compared with the results obtained in the PTC.
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Boutelis, Hassene, Dalila Titouna, Lazhar Serir, and Ammar Benderradji. "Numerical comparative study on fully-developed mixed laminar convection in two different physical models of parabolic trough solar receiver tube." All Sciences Abstracts 1, no. 1 (April 24, 2023): 8. http://dx.doi.org/10.59287/as-abstracts.542.
Повний текст джерелаАнотація:
In this work, a numerical study is presented on the effect of the buoyancy force induced by a non-uniform heat flux NUHF on a laminar air flow in the solar absorber of a parabolic trough collector PTC. The temperature and velocity distributions as well as the development of Nusselt number “Nu” and friction factor “f” were analysed for two physical models of PTC. The study is carried out with a Reynolds number of 2200, a Grashof number covering the range 1x106-6x106 and an angle of inclination of the cylinder of α = 0˚ (horizontal). Calculating the values of "Nu" and "f" showed larger values in the Jeter-PTC case (ϕrim =90֯, GC=20) than in the LS2-PTC (ϕrim=70֯, GC=22.7) case. We deduce that the hydrodynamic and thermal characteristics in the case of mixed convection are affected by the physical model of the chosen PTC.
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Zhang, Haofei, Bo Lei, Tao Yu, and Zhida Zhao. "Exergy Analysis of Two Kinds of Solar-Driven Cogeneration Systems in Lhasa, Tibet, China." International Journal of Photoenergy 2018 (November 1, 2018): 1–11. http://dx.doi.org/10.1155/2018/6702049.
Повний текст джерелаАнотація:
In this study, an exergy analysis of two kinds of solar-driven cogeneration systems consisting of solar collectors and an organic Rankine cycle (ORC) is presented for series mode and parallel mode. Three kinds of solar collectors are considered: flat-plate collectors (FPC), evacuated tube collectors (ETC), and parabolic trough collectors (PTC). This study mainly compares the exergy output of the two kinds of solar cogeneration systems under different temperatures of the return heating water and different inlet temperatures of the solar collectors. This study shows that, from the perspective of Wnet or E̲n, the parallel mode is superior to the series mode. From the perspective of Ez, the parallel mode is superior to the series mode when the solar collector is FPC; however, the series mode is superior to the parallel mode when the solar collector is PTC. When the solar collector is ETC, the result depends on the temperature of the return heating water. When the temperature of the return heating water is low (below 46°C), the series mode is better, and when the temperature of the return heating water is high (above 46°C), the parallel mode is better.
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Wang, Jiangjiang, Rujing Yan, Zhuang Wang, Xutao Zhang, and Guohua Shi. "Thermal Performance Analysis of an Absorption Cooling System Based on Parabolic Trough Solar Collectors." Energies 11, no. 10 (October 9, 2018): 2679. http://dx.doi.org/10.3390/en11102679.
Повний текст джерелаАнотація:
Solar radiation intensity significantly influences the cooling loads of building, and the two are correlated and accorded to a certain extent. This study proposes a double effect LiBr–H2O absorption cooling system based on the parabolic trough collector (PTC) of solar heat energy. Thermodynamic models including PTC and absorption chiller are constructed, and their accuracy is verified by comparing the simulation results and the experimental data. Subsequently, the impact of variable design parameters on the thermodynamic performance is analyzed and discussed. The analysis of a solar cooling system in a hotel case study is related to its operation in a typical day, the average coefficient of performance of the absorption chiller is approximately 1.195, and the whole solar cooling system achieves 61.98% solar energy utilization efficiency. Furthermore, the performance comparison of a solar cooling system in different types of building indicates that higher matching and a higher correlation coefficient between the transient solar direct normal irradiance and cooling load is helpful in decreasing the heat loss and improving systemic performance. The solar cooling system in the office building exhibits a correlation coefficient of approximately 0.81 and achieves 69.47% systemic thermal efficiency.
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Marotta, Gianluca, Daniela Fontani, Franco Francini, David Jafrancesco, Maurizio De Lucia, and Paola Sansoni. "Laser Profilometry on Micro-PTC." Energies 15, no. 14 (July 21, 2022): 5293. http://dx.doi.org/10.3390/en15145293.
Повний текст джерелаАнотація:
Profilometry is useful in detecting surface faults on solar concentrators, which can be imperfectly manufactured, thus affecting system performance. Profilometric analyses are performed on a micro-parabolic trough collector (m-PTC), with reduced sizes and greater mirror curvature than a usual PTC. The peculiar dimensions and shape of this micro-PTC request to develop a specific configuration of laser profilometry. It includes a laser diode with a converging lens placed in front of it, ensuring that the mirror curvature does not affect the beam reflection. A new method to calculate the spot position furnishes the reflected beam center even if it lies outside the target, giving it a virtual expansion. The profile is assessed with an iterative calculation, starting from a first point, physically measured. The results are the 3D profile reconstruction of the parabolic mirror and a map of the slope error for each mirror point. It also estimates the intercept factor, a parameter fundamental to optimize the m-PTC system, whose value is in agreement with a structured light measurement on the same object. This intercept factor was obtained averaging the local intercept factor calculated for each mirror point, which individuates the mirror portions not focusing the sunrays on the tube.
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Achouri, Intissar, Mouhamed Elbar Soudani, and Tlili Salah. "The efficiency of steam production by the Parabolic Trough Collector PTC with the use of nanofluids in the region of Ouargla." IOP Conference Series: Materials Science and Engineering 1204, no. 1 (November 1, 2021): 012005. http://dx.doi.org/10.1088/1757-899x/1204/1/012005.
Повний текст джерелаАнотація:
Abstract Concentrated solar power plants (CSP) contribute to global production (at present) with a capacity of 400 MW, and by 2020 they will reach approximately 20 GW, then nearly 800 GW by 2050, This will prevent the emission of 32 million tons of CO2 annually in 2020, and rise to 1.2 billion tons in 2050, according to the International Greenpeace “Solar Thermal Electricity” 2016 report. Among all the concentrated solar power (CSP) technology available to date, Parabolic Trough Collector (PTC) is the most promising, cost-effective, and efficient solution to generating electrical power, as PTC plants contribute in terms of global production capacity by 73.58% of the overall capacity of concentrated solar power plants (CSP). PTC stations in the production of electricity depend on the generation of hot and pressurized steam that rotates the turbines and to increase the effectiveness of PTC in the production of steam, we use in this study nanofluids by adding copper nanomaterials in different proportions to improve the Thermal efficiency of PTC. We also studied the effect of the width of the PTC slot on the fluid temperature. And from it on the amount of steam produced. The results of the study showed that the Thermal efficiency increases with the increase in the ratio of copper nanomaterials in the water, as the temperature of outlet water reaches 98°C, for the ratio of nanomaterials, 20%, in order to water flow 0.01 Kg/s and display the aperture 3.5 m.
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Al-Falahi, Adil, Falah Alobaid, and Bernd Epple. "Thermo-Economic Comparisons of Environmentally Friendly Solar Assisted Absorption Air Conditioning Systems." Applied Sciences 11, no. 5 (March 9, 2021): 2442. http://dx.doi.org/10.3390/app11052442.
Повний текст джерелаАнотація:
Absorption refrigeration cycle is considered a vital option for thermal cooling processes. Designing new systems is needed to meet the increasing communities’ demands of space cooling. This should be given more attention especially with the increasing conventional fossil fuel energy costs and CO2 emission. This work presents the thermo-economic analysis to compare between different solar absorption cooling system configurations. The proposed system combines a solar field, flashing tank and absorption chiller: two types of absorption cycle H2O-LiBr and NH3-H2O have been compared to each other by parabolic trough collectors and evacuated tube collectors under the same operating conditions. A case study of 200 TR total cooling load is also presented. Results reveal that parabolic trough collector combined with H2O-LiBr (PTC/H2O-LiBr) gives lower design aspects and minimum rates of hourly costs (5.2 $/h) followed by ETC/H2O-LiBr configuration (5.6 $/h). H2O-LiBr gives lower thermo-economic product cost (0.14 $/GJ) compared to the NH3-H2O (0.16 $/GJ). The absorption refrigeration cycle coefficient of performance ranged between 0.5 and 0.9.
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Achkari, O., and A. El Fadar. "Thermal performance comparison of different sun tracking configurations." European Physical Journal Applied Physics 88, no. 2 (November 2019): 20902. http://dx.doi.org/10.1051/epjap/2019190048.
Повний текст джерелаАнотація:
Parabolic trough collector (PTC) is one of the most widespread solar concentration technologies and represents the biggest share of the CSP market; it is currently used in various applications, such as electricity generation, heat production for industrial processes, water desalination in arid regions and industrial cooling. The current paper provides a synopsis of the commonly used sun trackers and investigates the impact of various sun tracking modes on thermal performance of a parabolic trough collector. Two sun-tracking configurations, full automatic and semi-automatic, and a stationary one have numerically been investigated. The simulation results have shown that, under the system conditions (design, operating and weather), the PTC's performance depends strongly on the kind of sun tracking technique and on how this technique is exploited. Furthermore, the current study has proven that there are some optimal semi-automatic configurations that are more efficient than one-axis sun tracking systems. The comparison of the mathematical model used in this paper with the thermal profile of some experimental data available in the literature has shown a good agreement with a remarkably low relative error (2.93%).
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Gharat, Punit V., Snehal S. Bhalekar, Vishwanath H. Dalvi, Sudhir V. Panse, Suresh P. Deshmukh, and Jyeshtharaj B. Joshi. "Chronological development of innovations in reflector systems of parabolic trough solar collector (PTC) - A review." Renewable and Sustainable Energy Reviews 145 (July 2021): 111002. http://dx.doi.org/10.1016/j.rser.2021.111002.
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