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Artykuły w czasopismach na temat "Parabolic Trough Collector (PTC)"
1
Sukanta, Anbu Manimaran, M. Niranjan Sakthivel, Gopalsamy Manoranjith i Loganathan Naveen Kumar. "Performance Enhancement of Solar Parabolic Trough Collector Using Intensified Ray Convergence System". Applied Mechanics and Materials 867 (lipiec 2017): 191–94. http://dx.doi.org/10.4028/www.scientific.net/amm.867.191.
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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., i Mohamed R. Gomaa. "A Review of Parabolic Trough Collector (PTC): Application and Performance Comparison". International Journal of Applied Sciences & Development 1 (31.12.2022): 24–34. http://dx.doi.org/10.37394/232029.2022.1.4.
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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 i 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, nr 2 (1.06.2021): 45–52. http://dx.doi.org/10.33971/bjes.21.2.7.
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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 i 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, nr 1 (1.04.2023): 012001. http://dx.doi.org/10.1088/1755-1315/1161/1/012001.
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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 i Valerio Marinelli. "Thermodynamic Analysis of a Parabolic Trough Collector (PTC) operating with gas-phase nanofluids". Journal of Physics: Conference Series 2385, nr 1 (1.12.2022): 012104. http://dx.doi.org/10.1088/1742-6596/2385/1/012104.
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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 i 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, nr 3 (22.06.2020): 155–68. http://dx.doi.org/10.29017/scog.41.3.334.
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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.
7
Marotta, Gianluca, Paola Sansoni, Franco Francini, David Jafrancesco, Maurizio De Lucia i Daniela Fontani. "Structured Light Profilometry on m-PTC". Energies 13, nr 21 (29.10.2020): 5671. http://dx.doi.org/10.3390/en13215671.
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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.
8
Korres, Dimitrios N., Evangelos Bellos, Panagiotis Lykas i Christos Tzivanidis. "An Innovative Parabolic Trough Collector Design with a Twin-Cavity Receiver". Applied Sciences 12, nr 24 (7.12.2022): 12551. http://dx.doi.org/10.3390/app122412551.
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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.
9
Said, Sana, Sofiene Mellouli, Talal Alqahtani, Salem Algarni i Ridha Ajjel. "New Evacuated Tube Solar Collector with Parabolic Trough Collector and Helical Coil Heat Exchanger for Usage in Domestic Water Heating". Sustainability 15, nr 15 (25.07.2023): 11497. http://dx.doi.org/10.3390/su151511497.
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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.
10
Aldaher, Abdallah Yousef Mohammad, Salah S. Al-Thyabat, Gangfeng Tan, Muhammad Usman Shoukat i Ebaa Khaled Mohammed Matar. "Structure of Parabolic Trough Collector Model for Local Heating and Air Conditioning". European Journal of Theoretical and Applied Sciences 1, nr 4 (6.07.2023): 186–96. http://dx.doi.org/10.59324/ejtas.2023.1(4).20.
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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 (
Rozprawy doktorskie na temat "Parabolic Trough Collector (PTC)"
1
Nation, Deju Denton. "A conceptual electrical energy storage (EES) receiver for solar parabolic trough collector (PTC) power plants". Thesis, University of Leeds, 2013. http://etheses.whiterose.ac.uk/5331/.
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This work outlines the conceptualization, modelling and design of a novel electrical energy storage (EES) receiver for use in solar parabolic trough collector (PTC) power plants. A hybridization of sodium sulphur (NaS) battery and parabolic trough collector (PTC) Technologies, the EES receiver concept could one day enable PTC power plants to operate 24 hrs using solar energy only, while simultaneously providing them significant ancillary power benefits. Modelling of the EES receiver operation is achieved using of a system of ten steady state (algebraic) equations and two transient (partial differential) temperature dependent equations. The method of solving the system consisted of precedence ordering and back substituting of the steady state equations to develop a single complex and highly non-linear algebraic equation, in terms of the main process heat flux ݍ′̇ ௗ,௧,. This equation was solved with the assistance of the Microsoft Excel goalseek tool. For the partial differential equations, a one dimensional finite difference approximation, consisting of a forward difference predictor, and a modified central difference corrector was used in discretization. Visual Basic code was then written to solve the system at each increment, each time utilizing the solution obtained for the complex non-linear algebraic equation in ݍ′̇ ௗ,௧. This allowed investigation of the initial heat-up and charge/discharge function of the conceptual solar field. Results of simulations indicate the concept is both promising and implementable and that the slightly higher heat losses in the order of 400 – 600 W/m (a direct result of the unavoidably larger size of the conceptual receiver), are seen to be insignificant when compared to the possible energy storage and power support benefits. Though NaS batteries are currently expensive, this condition is thought to be ephemeral, since cells are made from low cost and widely available materials. Thus falling battery prices (with future mass production) could make this novel energy storage concept worthy of evaluation in a prototype PTC power plant.
2
Sotte, Marco. "Design, test and mathematical modeling of parabolic trough solar collectors". Doctoral thesis, Università Politecnica delle Marche, 2012. http://hdl.handle.net/11566/242075.
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La radiazione solare alla
sua origine
è
una
fonte
di
energetica
ad
alta
exergia:
il
sole
ha
un’irradianza
pari
a
63
MW/m2.
Ma
all’arrivo
sulla
superficie
terrestre
questo
flusso
diminuisce
drasticamente.
Per
questa
ragione,
quando
si
necessita
di
elevate
temperature
o
elevate
exergie
si
adottano
sistemi
solari
a
concentrazione.
Fra
tutte
le
possibili
geometrie
i
concentratori
solari
parabolici
assiali
sono
di
gran
lunga
la
tecnologia
più
adottata.
Un
campo
di
utilizzo
dei
PTC
(parabolic
trough
collectors)
è
quello
del
calore
destinato
ai
processi
industriali:
questa
applicazione
ha
un
elevatissimo
potenziale
anche
alle
latitudini
dell’Europa
centro-‐meridionale.
Nella
presente
tesi
sono
discussi
i
risultati
di
un
progetto
di
ricerca
(PTC.project)
per
lo
studio
dei
PTC
applicati
alla
domanda
di
calore
dei
processi
industriali
o
di
altre
utenze
nell’intervallo
di
temperatura
fra
80
e
250
°C.
Sono
descritti
la
progettazione
e
la
realizzazione
di
due
prototipi
di
PTC,
con
informazioni
complete
riguardo
alle
caratteristiche
geometriche,
ai
materiali
e
ai
processi
produttivi.
Successivamente
sono
illustrati
i
risultati
di
test
preliminari
sui
prototipi,
assieme
alle
caratteristiche
di
un
banco
per
il
test
di
apparati
solari
a
temperature
comprese
fra
10
e
150
°C.
E’
poi
esposto
il
modello
matematico
sviluppato
per
descrivere
l’efficienza
ottica
e
termica
dei
concentratori,
completo
delle
routine
per
il
calcolo
della
posizione
del
sole.
Infine
è
esposto
un
ambiente
per
la
simulazione
dell’esercizio
annuale
di
un
campo
di
concentratori
accoppiato
ad
uno
specifico
profilo
di
domanda
termica.
I
risultati
suggeriscono
lo
sviluppo
di
questa
tecnologia
nel
panorama
delle
fonti
di
energia
rinnovabile
che
dovranno
essere
adottate
per
raggiungere
gli
obiettivi
energetici
ed
ambientali
fissati
in
vari
contesti
internazionali.
Ma
saranno
necessari
forti
investimenti
se
si
vorrà
imprimere
un’accelerazione
allo
sviluppo
dei
PTC
e
delle
tecnologie
solari
termiche
in
genere.Solar radiation at its origin is a high-exergy energy source: the Sun has an irradiance of about 63 MW/m2. But on the Earth’s surface solar energy flow dramatically decreases. For this reason, when high temperatures or high-exergy need to be reestablished, concentrated solar systems are adopted. Among all possible geometries, parabolic trough collectors are by far the most widespread technology. A field of usage of PTCs is in industrial process heat: this application has a dramatic potential and can be adopted at latitudes like those of central and southern europe. In this thesis the results of research project (PTC.project) for the study of PTCs in IPH and other heat demands in the temperature range from 80 to 250 °C are exposed. The design and manufacture of two prototypes are described in detail, giving complete information on geometrical characteristics, materials and manufacturing processes. Then the results of preliminary tests on the mentioned prototypes are produced, together with the characteristics of a test bench designed to determine PTCs performances with water and heat transfer oil as working fluids in a temperature range from 10 to 150 °C. Then a mathematical model, able to determine the performance of any PTC is described: the model accounts for optical and thermal losses of the collector, and also contains a routine code to calculate the solar position. In the end a simulation environment for annual analysis of the performance of a PTC applied to a specific process heat demand load is presented and the results obtained on a realistic heat demand yearly profile are described. The energetic results suggest that there could be space for this technology in the variety of renewable energies that will be needed to meet international goals in terms of energy and environment in the nearest future. But the experience acquired also suggests that investments are needed if an acceleration on the spreading of PTCs and other CSP technologies is to be realized
3
Brooks, Michael John. "Performance of a parabolic trough solar collector". Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/984.
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Hachicha, Ahmed Amine. "Numerical modelling of a parabolic trough solar collector". Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/129729.
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Concentrated Solar Power (CSP) technologies are gaining increasing interest in electricity generation due to the good potential for scaling up renewable energy at the utility level. Parabolic trough solar collector (PTC) is economically the most proven and advanced of the various CSP technologies. The modelling of these devices is a key aspect in the improvement of their design and performances which can represent a considerable increase of the overall efficiency of solar power plants. In the subject of modelling and improving the performances of PTCs and their heat collector elements (HCEs), the thermal, optical and aerodynamic study of the fluid flow and heat transfer is a powerful tool for optimising the solar field output and increase the solar plant performance. This thesis is focused on the implementation of a general methodology able to simulate the thermal, optical and aerodynamic behaviour of PTCs. The methodology followed for the thermal modelling of a PTC, taking into account the realistic non-uniform solar heat flux in the azimuthal direction is presented. Although ab initio, the finite volume method (FVM) for solving the radiative transfer equation was considered, it has been later discarded among other reasons due to its high computational cost and the unsuitability of the method for treating the finite angular size of the Sun. To overcome these issues, a new optical
model has been proposed. The new model, which is based on both the FVMand ray tracing techniques, uses a numerical-geometrical approach for considering the optic cone. The effect of different factors, such as: incident angle, geometric concentration and rim angle, on the solar heat flux distribution is addressed. The accuracy of the new model is verified and better results than the Monte Carlo Ray Tracing (MCRT) model for the conditions under study are shown.
Furthermore, the thermal behaviour of the PTC taking into account the nonuniform distribution of solar flux in the azimuthal direction is analysed. A general performance model based on an energy balance about the HCE is developed. Heat losses and thermal performances are determined and validated with Sandia Laboratories tests. The similarity between the temperature profile of both absorber and glass envelope and the solar flux distribution is also shown. In addition, the convection heat losses to the ambient and the effect of wind flow on the aerodynamic forces acting on the PTC structure are considered. To do this, detailed numerical simulations based on Large Eddy simulations (LES) are carried out. Simulations are performed at two Reynolds numbers of ReW1 = 3.6 × 105 and ReW2 = 1 × 106. These values corresponds to working conditions similar to those encountered in solar power plants for an Eurotrough PTC. The study has also considered different pitch angles mimicking the actual conditions of the PTC tracking mechanism along the day. Aerodynamic loads, i.e. drag and lift coefficients, are calculated and validatedwith measurements performed in wind tunnels. The indepen-dence of the aerodynamic coefficients with Reynolds numbers in the studied range is shown. Regarding the convection heat transfer taking place around the receiver,
averaged local Nusselt number for the different pitch angles and Reynolds numbers have been computed and the influence of the parabola in the heat losses has been analysed. Last but not the least, the detailed analysis of the unsteady forces acting on the PTC structure has been conducted by means of the power spectra of several probes. The analysis has led to detect an increase of instabilities when moving the PTC to intermediate pitch angles. At these positions, the shear-layers formed at the sharp corners of the parabola interact shedding vortices with a high level of coherence. The coherent turbulence produces vibrations and stresses on the PTC structure which increase with the Reynolds number and eventually, might lead to structural failure under certain conditions.
5
Alsaady, Mustafa Mohammed H. "Innovative design for ferrofluids based parabolic trough solar collector". Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/48221/.
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The demand for modern energy services is increasing rapidly. Solar energy has the potential to meet a significant share of the world’s energy request. Solar energy is one of the cleanest renewable forms with little or no effect on the environment. The concentrating solar power is one of the methods to harvest sun’s energy. Concentrating solar power has the advantage of easier energy storage compared to photovoltaic systems. However, the cost of energy generated by those systems is higher than conventional energy sources. It is necessary to improve the performance of concentrating solar power to make them cost competitive. Moreover, few countries such as Saudi Arabia are moving from energy based on fossil fuel to renewable energy, therefore, improving the performance of concentrating solar systems and reducing their cost is considered to emulate photovoltaic systems. This research aims to develop an innovative design of parabolic trough solar collector that uses magnetic nanofluids as a heat transfer fluid to enhance the thermal efficiency compared to conventional parabolic trough. Based on past researches, new parabolic trough design is then proposed and investigated. Ferromagnetic nanoparticles dispersed in common heat transfer fluids (ferrofluids) exhibit better thermos-physical properties compared to the base fluids. By applying the right magnetic intensity and magnetic field direction, the thermal conductivity of the fluid increased higher than typical nanofluids. Moreover, the ferrofluids exhibit excellent optical properties. The external magnetic source is installed to alter the thermo-physical properties of the fluid. This thesis is comprised of four studies including two experimental studies, one heat transfer analysis, and one economic and environmental study. A small scale parabolic trough collector was manufactured and assembled at the laboratory based on the British Standards. A steady-state method was used to measure the performance of the parabolic trough collector in corresponding studies. The performance of the ferrofluids as a heat transfer fluid was compared to the base fluid. The two experimental studies differ in the absorber used. The two absorbers used were a conventional non-direct absorber and a direct absorber without a selective surface that allows ferrofluids to absorb the incoming solar irradiation directly. The effects of nanoparticle concentration, anti-foaming, external magnetic field intensity were investigated. The volume fraction of nanoparticles was 0.05%, 0.25%, and 0.75%. Three different magnetic field intensities were investigated, 3.14 mT, 6.28 mT, and 10.47 mT. Using ferrofluids to enhance the heat transfer performance the efficiency of the ferrofluids solar collector was compared to the based fluid (water). The results show that the parabolic trough solar collector in the experiment has similar performance of flat-plate solar collectors. The efficiency of the collector improved when ferrofluids water used compared to water. Ferrofluids with low concentration improved the performance of the solar collector. The ferrofluids showed much better performance at higher reduced temperature with lower overall heat loss coefficient. Due to the non-Newtonian behaviour of the fluid, increasing the volume fraction of particles will suppress the enhancement. The pH of ferrofluids influences the behaviour of the fluid. pH values higher than 5 showed a Newtonian behaviour of the fluid. In the presence of magnetic field, the performance of the solar collector enhanced further. By increasing the magnetic field intensity, the absorbed energy parameter increased, and at higher magnetic field intensity, the rate of enhancement decreases due to the magnetic saturation of ferrofluids. In this study, the performance of non-direct absorption receiver was better than the direct absorption receiver. However, the performance of the collector with a direct absorption receiver and using ferrofluids in the presence of the external magnetic field in some cases was higher than the performance of non-direct receiver with water as heat transfer medium. The performance of ferrofluids based parabolic trough collector was theoretically investigated. The correlation, equations, and specifications used in the model were discussed in detail. The model was used to study two different parabolic trough designs. First, the parabolic trough was validated with the experimental results of AZTRAK platform. The results of the model show a good agreement with the experimental data. Thereafter, nanoparticles were added to the heat transfer fluid, and the performance of the collector with and without the presence of external magnetic field was determined. The performance of the collector did not change a lot unless the external magnetic field was present. Moreover, the effect of the glass envelope on the performance was observed. A glass cover with vacuum in the annulus has higher performance and less thermal loss. Second, the model was used to study the performance of the test rig ferrofluids based parabolic trough. The performance of the parabolic trough was first considered as concentrating collector and then as a non-concentrating collector. With the lack of an external magnetic field, the efficiency changed slightly, wherein the presence of the external magnetic field the performances of the collector enhanced and showed higher performances. In General, the presence of the magnetic field showed promising enhancement. Economic and environmental effects of using ferrofluids based solar collector compared to a flat-plate collector for household water heating systems. Results show that the ferrofluids based parabolic trough has lower payback period and higher economic saving at its useful life end than a flat-plate solar collector. The ferrofluids based collector has higher embodied energy and pollution offsets tan flat-plate collector. Moreover, if 50% insertion of ferrofluids based parabolic trough for domestic hot water could be achieved in Tabuk over 83,750 metric Ton of CO2 could be eliminated.
6
Woodrow, Oliver Rhys. "Characterisation of a parabolic trough collector using sheet metal and glass mirror strips". Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/62804.
Pełny tekst źródłaStreszczenie:
A novel type of parabolic trough collector was characterised using a very basic theoretical model. This model looked at an ideal case and provided a basic expectation that was compared to actual measurements. The model showed that greater improvements can be achieved if heat losses to the environment are limited or omitted. This can be achieved by using a glass shield to insulate the receiver in a vacuum to limit the effect wind has and therefore limit convective losses. The experimental characterisation of the PTC consisted of taking six different temperature measurements to better understand the energy balances taking place. Four different configurations were tested, using two different types of concentrator and in each case a receiver that was either unpainted or painted with a semi matte black paint. The different types of concentrator were either stainless steel sheet metal or discretised glass mirror strips, similar to a linear Fresnel collector. Experimental runs were conducted on cloudless days for an hour and 15 minutes. This allowed for three runs to be performed on a single day. Using the theoretical model and comparing it to the experimental data, an efficiency was calculated. This efficiency averaged 14 % when the receiver was unpainted and 13 % when the receiver was painted for the metal sheets. The glass mirror strips had average efficiencies of 54 % and 45 % for an unpainted and painted receiver respectively. The model is very basic and can be improved upon if more variables are taken into consideration, such as convective heat losses. It was also recommended that wind measurements are taken in future tests. A property looked at to evaluate the effectiveness of each type of configuration was the average energy supplied to the thermal heating fluid over the course of an experimental run. For this the averaged values over all the experimental runs conducted for stainless steel sheet metal were 258 W and 332 W for an unpainted and painted pipe respectively. When using the glass mirrors an average energy value of 1049 W was supplied when the pipe was unpainted and an average of 1181 W was gained in the runs conducted after the pipe had been painted. Painting the receiver had little to no effect. The surface temperature of the receiver after painting the pipe was not higher and a slight increase in the energy gained by water was observed. This was explained by inaccuracies during testing as scattered light may have caused an interference on some of the measurements. There were also human inaccuracies in testing which should be omitted in future tests by implementing, for one, a functional tracking system. Future tests should be designed in such a way to completely omit irradiance affecting the thermocouple taking the measurement. Glass mirrors fared far better than the stainless steel sheet metal counterpart. It was recommended that they are used as the concentrator of choice. Higher efficiencies were achieved and in some cases almost four times the energy was supplied to the water in the pipe. This was attributed to a much lower concentrator temperature, on average 11 °C lower than the temperature of the metal sheets, as well as a much better ability to concentrate sunlight onto a single focal point. However, the glass mirror strips were proven to be very fragile and as such, require protection from the elements. While the strips were lighter and caused less of a load during windy conditions, they were susceptible to oscillations from gusty wind. This led to a number of strips breaking and needed to be replaced. By discretising the strips into individual pieces, they had the benefit of only needing to replace the strips that were damaged. This is also true for all future runs. It is still recommended that a tarp be used to protect the glass mirrors. Using glass mirror strips as a concentrator combined LFC technology with PTC technology and a novel PTC design was achieved. The design still required the installation area of a PTC. The novel design was compared to Industrial Solar’s industrial LFC module, LF-11, as it shares many similarities to LFC technology. The peak thermal output of the rig was significantly lower at 346 W/m2 compared to the industrial value of 562 W/m2. However, the noteworthy differences in design and optimisation between the two modules meant the results achieved were comparable. It is expected that better and more comparable results can be realised once the inherent flaws in the design, such as tracking the sun, aperture size and adding a vacuum absorber, are addressed. It is recommended that more research and emphasis is put into this field as an alternative energy power plant for South Africa.Dissertation (MEng)--University of Pretoria, 2017.
Chemical Engineering
MEng
Unrestricted
7
Carrillo, Juan Felipe (Carrillo Salazar). "Mechanical development of an actuation system for a parabolic solar trough collector". Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/83687.
Pełny tekst źródłaStreszczenie:
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references (page 26).
This thesis documents my personal contribution to the development of a hydraulic-based actuation system for a solar trough collector. The goal of this project was to design the actuation system using hydraulic actuators for a four meter solar collector prototype in Pittsfield, New Hampshire. After considering several hydraulic system architectures and conducting in-depth analysis into two of them, the idler pulley scheme was chosen. This mechanism uses a double rod end hydraulic actuator connected to wire rope wrapped around a capstan drum and an idler pulley. The model was optimized for mechanical performance, and it is expected to be a more cost effective option than the existing actuation system in New Hampshire once the controls equipment required to actuate the hydraulic cylinders for the new design is specified.
by Juan Felipe Carrillo.
S.B.
8
Meiser, Siw [Verfasser]. "Analysis of parabolic trough concentrator mirror shape accuracy in laboratory and collector / Siw Meiser". Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2014. http://d-nb.info/1052217427/34.
Pełny tekst źródła
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Ibrahim, Idowu David. "Development of Smart Parabolic Trough Solar Collector for Water Heating and Hybrid Polymeric Composite Water Storage Tank". Electronic Thesis or Diss., université Paris-Saclay, 2020. http://www.theses.fr/2020UPASG049.
Pełny tekst źródłaStreszczenie:
Les sources d’énergies utilisées pour le chauffage de l’eau dans les bâtiments commerciaux et résidentielles sont multiples. Ces ressources sont essentiellement électriques dans les milieux urbains et utilisent le bois dans les milieux ruraux. Le pourcentage de l’énergie solaire utilisé reste assez faible. Les méthodes les utilisées pour produire l’eau chaude sont pour basés pour l’essentielle sur l’utilisation des résistances électrique ou des capteurs solaire plat. Le travail présenté dans cette thèse est basé sur l’utilisation des concentrateurs solaires pour chauffer des collecteurs d’énergie. Le rendement est augmenté par le développement de nouveau matériaux pour le stockage.La structure pour le support du collecteur a été conçue et analysée utilisant le logiciel Solidworks®. Les forces agissant sur les éléments de la structure sont simulées pour assurer la fiabilité du support lors des différentes conditions de fonctionnement. L’analyse par la méthode des éléments finis a permis la vérification de la structure utilisée pour le réflecteur et son support.Les performances énergétiques ont été simulées pour cinq ans d’opération utilisant le logiciel Matlab Simulink®. Cette simulation a été basée sur l’utilisation de trois données différentes. La première est une base de données météorologique de cinq ans en Afrique du Sud dans la Ville de Tshwane. La deuxième est un profil d’utilisation pour un foyer type. La troisième est le coût de complément de chauffage en électricité dépendant de l’heure de l’utilisation. Cette simulation a permis la validation des choix de dimensions de différents éléments du système de chauffage.Cette étude a permis le développement d’une approche pour la conception d’un système de chauffage solaire en optimisant les dimensions des différents éléments pour un foyer type et une région spécifique.De plus, nous avons conçu un autre réservoir d’eau chaude. Nous avons démontré que l'utilisation de matériaux polymères et d'autres matériaux comme le polyuréthane, le sel et l'aluminium est possible pour le développement d'un réservoir de stockage d'eau chaude en fonction de leurs propriétés inhérentes.L'extension des résultats de cette thèse améliorera encore les conceptions des technologies de concentrateurs solaires et des systèmes de chauffage solaire de l'eau. Par conséquent, certaines recommandations et suggestions sont mises en évidence afin d'améliorer la conception, l'analyse et les performances globales du systèmeIn recent years, various energy sources and methods have been used to heat water in domestic and commercial buildings. The known sources for water heating include electrical energy and solar radiation energy in the urban regions or burning of firewood in the rural areas. Several water heating methods may be used such as electrical heating elements, solar concentrators, flat plate collectors and evacuated tube collectors. This thesis focuses on ways to further improve the system’s performance for water heating through the combined use of solar energy and solar concentrator technique. Furthermore, the study proposed an alternative design method for the hot water storage tank.The solar collector-supporting frame was designed and analysed using Solidworks®. The forces acting on the structural members were simulated to determine the capacity of the frame to sustain the load, and the possible regions on the supporting frame, which could potentially fail while in operation.Energy performance was simulated for five years of operation using Matlab Simulink® software. This simulation was based on the use of three different data. The first is a five-year weather database of the City of Tshwane in South Africa. The second is a hot water consumption profile for a typical household. The third is the cost of additional heating with electricity depending on the time of use. This simulation allowed the validation of the choices of the different elements of the heating system.This study allowed the development of an approach for the design of a solar heating system by optimising the dimensions of the different elements for a typical household and a specific region.In addition, the use of polymeric materials and other materials like polyurethane, salt and aluminium is possible for the development of a hot water storage tank based on their inherent properties.Extending the findings in this thesis will further improve the designs for solar concentrator technologies and solar water heating systems. Therefore, some recommendations and suggestions are highlighted in order to improve the overall system design, analysis and performance
10
Nolte, Henriette C. "Analysis and Optimisation of a Receiver Tube for Direct Steam Generation in a Solar Parabolic Trough Collector". Diss., University of Pretoria, 2014. http://hdl.handle.net/2263/45965.
Pełny tekst źródłaStreszczenie:
This study focused on a numerical second law analysis and optimisation of a receiver tube op-
erating in a parabolic trough solar collector for small-scale application. The receiver functioned
in a Rankine cycle. The focus was on entropy generation minimisation in the receiver due to
the high quality exergy losses in this component. Water functioned as the working
uid and
was heated from ambient conditions (liquid) to a superheated state (vapour), consequently, the
receiver tube was subject to both single phase as well as two-phase
ow.
Entropy generation in the receiver tube was mainly due to nite temperature di erences as well
as
uid friction. The contribution of each of these components was investigated. Geometrical
as well as operating conditions were investigated to obtain good guidelines for receiver tube
and plant design. An operating pressure in the range of 1 MPa (Tsat = 180 C) to 10 MPa
(Tsat = 311 C) was considered. Furthermore a mass
ow range of 0:15 kg=s to 0:4 kg=s was
investigated. Results showed that beyond a diameter of 20 mm, the main contributor to the entropy generation
was the nite temperature di erences for most conditions. Generally, operating pressures below
3 MPa showed bad performance since the
uid friction component was too large for small
operating pressures. This phenomenon was due to long two-phase lengths and high pressure
drops in this region. The nite temperature di erence component increased linearly when the
tube diameter was increased (due to the increase in exposed area) if the focused heat
ux was
kept constant. However, the
uid friction component increased quadratically when the diameter
was reduced.
In general when the concentration ratio was increased, the entropy generation was decreased.
This was due to more focused heat on each section of the receiver pipe and, in general, resulted
in shorter receiver lengths. Unfortunately, there is a limit to the highest concentration ratio
that can be achieved and in this study, it was assumed to be 45 for two-dimensional trough
technology.
A Simulated Annealing (SA) optimisation algorithm was implemented to obtain certain optimum
parameters. The optimisation showed that increasing the diameter could result in a decrease in
entropy generation, provided that the concentration ratio is kept constant. However, beyond a
certain point gains in minimising the entropy generation became negligible. Optimal operating
pressure would generally increase if the mass
ow rate was increased. Finally, it was seen that
the highest operating pressure under consideration (10 MPa) showed the best performance
when considering the minimisation of entropy in conjunction with the maximisation of the
thermodynamic work output.Dissertation (MEng)--University of Pretoria, 2014.
tm2015
Mechanical and Aeronautical Engineering
MEng
Unrestricted
Książki na temat "Parabolic Trough Collector (PTC)"
1
Coccia, Gianluca, Giovanni Di Nicola i Alejandro Hidalgo. Parabolic Trough Collector Prototypes for Low-Temperature Process Heat. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27084-5.
Pełny tekst źródła
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Minder, S. Modelling, testing, and performance analysis of the Luz LS-2 Parabolic trough [sic] collector test facility in Sde Boker, Israel: Final report. [Jerusalem]: State of Israel, Ministry of Energy and Infrastructure, Research and Development Division, 1994.
Znajdź pełny tekst źródła
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Upadhyay, Bhargav, Amitkumar Patel i PV Ramana. Design Optimization & Performance Analysis of Solar PTC: Solar Parabolic Trough Collector. LAP LAMBERT Academic Publishing, 2021.
Znajdź pełny tekst źródła
4
Coccia, Gianluca, Giovanni Di Nicola i Alejandro Hidalgo. Parabolic Trough Collector Prototypes for Low-Temperature Process Heat. Springer, 2016.
Znajdź pełny tekst źródła
5
Coccia, Gianluca, Giovanni Di Nicola i Alejandro Hidalgo. Parabolic Trough Collector Prototypes for Low-Temperature Process Heat. Springer London, Limited, 2016.
Znajdź pełny tekst źródłaCzęści książek na temat "Parabolic Trough Collector (PTC)"
1
Mohammed, Hussein A., Hari B. Vuthaluru i Shaomin Liu. "Parabolic Trough Collector (PTC)". W Parabolic Trough Solar Collectors, 15–36. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-08701-1_2.
Pełny tekst źródła
2
Mohammed, Hussein A., Hari B. Vuthaluru i Shaomin Liu. "PTC Enhancement Using Nanofluids". W Parabolic Trough Solar Collectors, 121–69. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-08701-1_4.
Pełny tekst źródła
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Mohammed, Hussein A., Hari B. Vuthaluru i Shaomin Liu. "PTC Enhancement Using Passive Techniques". W Parabolic Trough Solar Collectors, 37–120. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-08701-1_3.
Pełny tekst źródła
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Jie, Ji, Han Chongwei, He Wei i Pei Gang. "Dynamic Performance of Parabolic Trough Solar Collector". W Proceedings of ISES World Congress 2007 (Vol. I – Vol. V), 750–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75997-3_141.
Pełny tekst źródła
5
Messadi, Asma, i Youssef Timoumi. "Thermal Study of a Parabolic Trough Collector". W Design and Modeling of Mechanical Systems - II, 811–21. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17527-0_81.
Pełny tekst źródła
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Goel, Anubhav, Om Prakash Verma i Gaurav Manik. "Analytical Modeling of Parabolic Trough Solar Collector". W Soft Computing: Theories and Applications, 367–78. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0707-4_34.
Pełny tekst źródła
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Malan, Anish, i K. Ravi Kumar. "Optical Modeling of Parabolic Trough Solar Collector". W Proceedings of the 7th International Conference on Advances in Energy Research, 81–89. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5955-6_8.
Pełny tekst źródła
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Yılmaz, İbrahim Halil, Mehmet Sait Söylemez, Hakan Hayta i Recep Yumrutaş. "A Process Heat Application Using Parabolic Trough Collector". W Springer Proceedings in Physics, 137–41. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05521-3_18.
Pełny tekst źródła
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Gunay, Ceyda, Anil Erdogan i C. Ozgur Colpan. "Exergetic Optimization of a Parabolic Trough Solar Collector". W The Role of Exergy in Energy and the Environment, 677–89. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-89845-2_48.
Pełny tekst źródła
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Agagna, Belkacem, i Arezki Smaili. "Numerical and Experimental Study of Parabolic Trough Solar Collector". W ICREEC 2019, 93–100. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5444-5_12.
Pełny tekst źródłaStreszczenia konferencji na temat "Parabolic Trough Collector (PTC)"
1
Schiricke, Bjo¨rn, Robert Pitz-Paal, Eckhard Lu¨pfert, Andreas Neumann, Klaus Pottler, Markus Pfa¨nder i Klaus-Ju¨rgen Riffelmann. "Validation of Optical Modeling of Parabolic Trough Collectors by Flux Measurement". W ASME 2007 Energy Sustainability Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/es2007-36216.
Pełny tekst źródłaStreszczenie:
In order to optimize the solar field output of parabolic trough collectors (PTC) it is essential to study the influence of collector and absorber geometry on the optical performance. The optical ray-tracing model of PTC conceived for this purpose uses photogrammetrically measured concentrator geometry in commercial Monte Carlo ray tracing software. The model has been validated with measurements of a scanning flux measurement system, measuring the solar flux density distribution close to the focal line of the PTC. The tool uses fiber optics and a CCD-camera to scan the focal area of a PTC module. Since it is able to quantitatively detect spilled light with good spatial resolution it provides an evaluation of the optical efficiency of the PTC. For comparison of ray tracing predictions with measurements, both flux maps and collector geometry have been measured under identical conditions on the Eurotrough prototype collector at PSA. The validation of the model is provided by three methods: the comparison of measured intercept factors with corresponding simulations; comparison of measured flux density distributions with corresponding ray tracing predictions; and comparison of thermographically measured temperature distribution on the absorber surface with flux density distribution predicted for this surface. Examples of sensitivity studies performed with the validated model are shown.
2
Jabbar, Hussein Ali, Dhafer Manea Hachim i Kareem J. Alwan. "Heat transfer fluids in parabolic trough collector (PTC) : A review study". W 1ST INTERNATIONAL CONFERENCE ON ACHIEVING THE SUSTAINABLE DEVELOPMENT GOALS. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0135997.
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Sensoy, Tugba S., Sam Yang i Juan C. Ordonez. "Volume Element Model for Modeling, Simulation, and Optimization of Parabolic Trough Solar Collectors". W ASME 2017 11th International Conference on Energy Sustainability collocated with the ASME 2017 Power Conference Joint With ICOPE-17, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/es2017-3597.
Pełny tekst źródłaStreszczenie:
In this paper we present a dynamic three-dimensional volume element model (VEM) of a parabolic trough solar collector (PTC) comprising an outer glass cover, annular space, absorber tube, and heat transfer fluid. The spatial domain in the VEM is discretized with lumped control volumes (i.e., volume elements) in cylindrical coordinates according to the predefined collector geometry; therefore, the spatial dependency of the model is taken into account without the need to solve partial differential equations. The proposed model combines principles of thermodynamics and heat transfer, along with empirical heat transfer correlations, to simplify the modeling and expedite the computations. The resulting system of ordinary differential equations is integrated in time, yielding temperature fields which can be visualized and assessed with scientific visualization tools. In addition to the mathematical formulation, we present the model validation using the experimental data provided in the literature, and conduct two simple case studies to investigate the collector performance as a function of annulus pressure for different gases as well as its dynamic behavior throughout a sunny day. The proposed model also exhibits computational advantages over conventional PTC models-the model has been written in Fortran with parallel computing capabilities. In summary, we elaborate the unique features of the proposed model coupled with enhanced computational characteristics, and demonstrate its suitability for future simulation and optimization of parabolic trough solar collectors.
4
Rodríguez, Jainer S., Duván C. Villegas, Marley C. Vanegas i Guillermo E. Valencia. "Experimental Study of a Parabolic Trough Collector for Low Enthalpy Processes in the City of Barranquilla". W ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71245.
Pełny tekst źródłaStreszczenie:
Solar thermal energy is an alternative to provide heat for low-enthalpy processes at commercial and residential sectors in communities with energy sources scarcity. The present work is focused in the experimental performance analysis of a parabolic trough collector (PTC) designed and manufactured to minimize construction costs by setting the best parabolic profile and rim angle to improve thermal efficiency through enhancing light reflection in its parabolic surface, compound by conventional flat mirrors. The design considers an uncovered copper alloy receiver aligned with the focus of the reflective surface supported on a light metal structure. Sunlight collection area was defined at 1.2 m2 to allow installation of serial or parallel modular arrangements at reduced spaces like a building rooftop, the concentration ratio for this PTC is close to 33. This device was designed to use water as heat transfer fluid (HTF) and to be operated under environmental conditions of the city of Barranquilla, Efficiency curves were obtained based on experimental tests conducted with multiple HTF flow rate and varying reflecting surface slope for one PTC, obtaining a peak efficiency of 48 % and a without a tracking system. This device can be manufactured with a cost close to 80 USD/m2.
5
Ghaith, Fadi A., i Haseeb-ul-Hassan Razzaq. "Thermal Performance of Parabolic Trough Collector for Cooling Applications in Residential Buildings in UAE". W ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66846.
Pełny tekst źródłaStreszczenie:
This paper addresses the potential of integrating Parabolic Trough Collectors (PTC) with a double-effect absorption chiller for the purpose of space cooling in residential buildings. The proposed model was designed such to provide a continuous cooling while in the absence of sun, the bio-mass heater was used as an auxiliary heating source. In this study, the thermal performance was investigated and a feasibility study was conducted in order to assess the system’s economic and environmental impacts. The obtained model was implemented on a case study represented by a four-floored residential building based in Dubai with a net cooling load requirement of 366 kW. The obtained results from the numerical simulation were analyzed to identify the optimum configuration in terms of feasibility and potential savings. It was found that a hybrid system with 40% solar contribution is the optimum solution compared to other alternatives. The proposed system achieved Annual Energy Consumption savings (AEC) of about 556061 kWh and a reduction by 69% in the annual operating costs. Moreover; the system reduced the Carbon-dioxide emissions by 344 tons/year. The payback period of the proposed system was found to be 2.42 years only.
6
Wagner, Michael J., Mark S. Mehos, David W. Kearney i Andrew C. McMahan. "Modeling of a Parabolic Trough Solar Field for Acceptance Testing: A Case Study". W ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54245.
Pełny tekst źródłaStreszczenie:
As deployment of parabolic trough concentrating solar power (CSP) systems ramps up, the need for reliable and robust performance acceptance test guidelines for the solar field is also amplified. Project owners and/or EPC contractors often require extensive solar field performance testing as part of the plant commissioning process in order to ensure that actual solar field performance satisfies both technical specifications and performance guaranties between the involved parties. Performance test code work is currently underway at the National Renewable Energy Laboratory (NREL) in collaboration with the SolarPACES Task-I activity, and within the ASME PTC-52 committee. One important aspect of acceptance testing is the selection of a robust technology performance model. NREL1 has developed a detailed parabolic trough performance model [1] within the SAM software tool [2]. This model is capable of predicting solar field, sub-system, and component performance. It has further been modified for this work to support calculation at sub-hourly time steps. This paper presents the methodology and results of a case study comparing actual performance data for a parabolic trough solar field to the predicted results using the modified SAM trough model. Due to data limitations, the methodology is applied to a single collector loop, though it applies to larger subfields and entire solar fields. Special consideration is provided for the model formulation, improvements to the model formulation based on comparison with the collected data, and uncertainty associated with the measured data. Additionally, this paper identifies modeling considerations that are of particular importance in the solar field acceptance testing process and uses the model to provide preliminary recommendations regarding acceptable steady-state testing conditions at the single-loop level.
7
Zhu, Guangdong, Judy Netter i Allison Gray. "A High-Precision Control System Used for Optical Efficiency Measurements of Parabolic Trough Collectors at NREL". W ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88545.
Pełny tekst źródłaStreszczenie:
The testing facility called the Outdoor Collector Test Loop (OCTL), which is located at the Solar Industrial Mesa Top Area (SIMTA) of National Renewable Energy Lab (NREL), measures the optical efficiency of parabolic trough collectors. It uses a dual-axis, large-payload solar tracker to hold a parabolic trough collector module and track the sun. Due to the growing need for measurement accuracy and efficiency, a new tracking control system for the tracker has been acquired and successfully commissioned as of February 2012. As part of the customization needed to address the unique testing requirements at the OCTL, new tracking modes have been designed and embedded into the new controller. In particular, the incidence angle modifier (IAM) and fixed-azimuth modes allows the OCTL to readily measure the IAM values for a trough collector, significantly improving the speed and efficiency of IAM data collection compared to the previous controller (with test times of days versus weeks). The Siemens S7 1200 PLC integrates various hardware components (such as the hydraulic pump, encoders, sun sensor and wind sensor) through corresponding communication channels, and a Simatic HMI panel provides a powerful user-friendly interface for operation, monitoring, and diagnostics. In addition, NREL integrated the Siemens tracking control program with the existing LabVIEW program that serves as a user interface of the thermal fluid loop, and calibrated the tracking platform as a whole to characterize its tracking accuracy. At last, the challenges and opportunities for the control system in the area of concentrating solar power (CSP) are briefly discussed.
8
Lokurlu, Ahmet, i Christian Gunkel. "Advanced Solar Cooling, Heating and Steam Generation Systems Based on the Novel Technological Development “SOLITEM Parabolic Trough Collector PTC”". W EuroSun 2010. Freiburg, Germany: International Solar Energy Society, 2010. http://dx.doi.org/10.18086/eurosun.2010.10.28.
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Gharbia, Yousef, Mohamed Fayed i Mohammed Anany. "Steam Generation for EHOR Using PTC System Modeled in SAM". W ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10332.
Pełny tekst źródłaStreszczenie:
Abstract Kuwait’s oil reserves include approximately 13 bn barrels of heavy oil, primarily located in the northern region of the country. The Lower Fars (LF) heavy oil development project aims to extract heavy oil from the Ratqa oil field. The US$7 bn project is being developed in phases, with the first phase expected to start in 2019 with a production rate of 60,000 Barrel of Oil Per Day (BOPD). This amount is planned to ramp up to 270,000 BOPD by 2030. The steam required for the Enhanced Heavy Oil Recovery (EHOR) process can be either generated by using conventional fuels or renewable energy resources, such as solar energy. The amount of steam required to recover a certain quantity of heavy oil depends on the value of Steam to Oil Ratio (SOR). The aim of this work was to determine the specifications of a parabolic trough collector field required to produce steam with the right properties to recover 270,000 BOPD from Lower Fars reservoir. The Industrial Process Heat (IPH) model of the System Advisor Model (SAM) software, developed by the National Renewable Energy Laboratory (NREL), was used for this purpose. The capital cost and the running cost of the project, as well as the Levelized Cost of Heat (LCOH), were also determined. The simulation was implemented on EuroTrough ET150 trough collectors and Schott PTR 70 receiving tubes. Different plant designs with different types of heat transfer fluids (HTF) including Therminol VP-1, Therminol 59, Therminol 66, Dowtherm Q, Dowtherm RP, and Caloria HT43 have been investigated.
10
Hua, Meng, Liang Zhang, Zi-Qin Zhu, Li-Wu Fan, Zi-Tao Yu i Ya-Cai Hu. "An Experimental Study of Thermal Performance of a Two-Phase Loop Thermosyphon (TPLT)-Based Steam Generator: Effects of Thermal Boundary Conditions". W ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17104.
Pełny tekst źródłaStreszczenie:
For the Parabolic trough collector (PTC) system, thermal boundary condition of the receiver (or heating section) is important for the thermal optimization. In this work, effects of thermal boundary on thermal performance of the two-phase loop thermosyphon (TPLT) natural circulation PTC system was investigated experimentally. Three kinds of thermal boundary heating conditions (upper and lower half, and whole circular heated) and two filling ratios (FR = 0.6, 1.2) were adopted in this paper. The results show that half heating condition can improve heat transfer performance in receiver and system thermal resistance. But the preferred half heating boundary was varied as the filling ratio was changed. However, a lower thermal efficiency was observed for the partly heating boundary conditions. For a low heat flux condition in this work, the effects of thermal boundary on flow instability were not obvious, especially for the bigger filling ratio condition.
Raporty organizacyjne na temat "Parabolic Trough Collector (PTC)"
1
Gleckman, Philip, i Nicolas R. Peralta. Development of a Green Parabolic Trough Collector. Office of Scientific and Technical Information (OSTI), październik 2018. http://dx.doi.org/10.2172/1489170.
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Dudley, V., L. Evans i C. Matthews. Test results, Industrial Solar Technology parabolic trough solar collector. Office of Scientific and Technical Information (OSTI), listopad 1995. http://dx.doi.org/10.2172/211613.
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Kurup, Parthiv, i Craig S. Turchi. Parabolic Trough Collector Cost Update for the System Advisor Model (SAM). Office of Scientific and Technical Information (OSTI), listopad 2015. http://dx.doi.org/10.2172/1227713.
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Pina, Eduardo A., Luis M. Serra, Miguel A. Lozano, Adrián Hernández i Ana Lázaro. Solar DH – network hydraulics and supply points. IEA SHC Task 55, październik 2020. http://dx.doi.org/10.18777/ieashc-task55-2020-0008.
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The present factsheet summarizes the study ”Comparative Analysis and Design of Solar Based Parabolic Trough - ORC Cogeneration Plant for a Commercial Centre” performed by the Universidad de Zaragoza (Spain) and published in 2020 [1]. Two novel solar based PTC-ORC cogeneration systems, producing power and cooling, were pre-designed, considering commercially available pieces of equipment, to cover the annual energy demands of a commercial centre located in Zaragoza (Spain).
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Stettenheim, Joel. Second Generation Novel High Temperature Commercial Receiver & Low Cost High Performance Mirror Collector for Parabolic Solar Trough. Office of Scientific and Technical Information (OSTI), luty 2016. http://dx.doi.org/10.2172/1332248.
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