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Articles de revues sur le sujet « Linear parabolic collector »

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Auteur : Grafiati
Publié le 10 mars 2023

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1

MA Jun, 马. 军., 王成龙 WANG Cheng-long et 夏养君 XIA Yang-jun. « Compound parabolic collector for linear Fresnel reflector system ». Optics and Precision Engineering 27, no 12 (2019) : 2542–48. http://dx.doi.org/10.3788/ope.20192712.2542.

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2

Dutta, Pijush, Supradip Kumar Biswas et Madhurima Majumder. « Parametric optimization of Solar Parabolic Collector using metaheuristic Optimization ». Computational Intelligence and Machine Learning 2, no 1 (20 avril 2021) : 26–32. http://dx.doi.org/10.36647/ciml/02.01.a004.

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Estimation of an exceptionally exact model for solar parabolic collector from the experimental data is an important task for the researchers for the recreation, assessment, control and plan. Efficient optimization techniques are fundamental to accomplish this undertaking. In this paper a modified optimization technique is proposed for productive and precise estimation of the parameters of solar parabolic collector. The proposed algorithm is concentrated on the modification of Elephant Swarm Water Search Algorithm. This algorithm tested on parabolic collector parameters, namely reflectivity, Absorptivity & period of sun incidence. Response surface methodology has been used to implement the non linear model between the input & output parameters of the process. In addition, the proposed ESWSA optimization technique has been tested against the manufacture datasheet of solar parabolic reflector. Results show the effectiveness of ESWSA algorithm for modeling of the solar parabolic systems. Keyword : Solar parabolic Collector, Parameters, ESWSA, Optimization
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3

Al-Farajat, Rabaa K., Mohamed R. Gomaa et Mai Z. Alzghoul. « Comparison Between CSP Systems and Effect of Different Heat Transfer Fluids on the Performance ». WSEAS TRANSACTIONS ON HEAT AND MASS TRANSFER 17 (31 décembre 2022) : 196–205. http://dx.doi.org/10.37394/232012.2022.17.21.

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While fossil fuel sources have declined and energy demand has increased, in addition to the climate change crisis, the world turned to using renewable energies to get its energy. Concentrated solar power (CSP) is one of the main technologies used for this purpose. This study aims to compare the different concentrated solar power technologies in terms of their efficiency, cost, concentration ratio, and receiver temperature. Results showed that technologies were arranged according to temperatures from high to low as follows; the parabolic dish reflector, central receiver collector, linear Fresnel reflector, and parabolic trough collector. According to cost, the parabolic dish reflector has the highest price, while the linear Fresnel reflector has the lowest price. Also, the parabolic dish reflector has the highest efficiency among the others, followed by the central receiver collector, then the linear Fresnel reflector, and the parabolic trough collector respectively. Additionally; the study represented that point-focus devices have a high percentage of concentration ratio than line-focus devices. Finally, in order to exploit these sources throughout the day, it is recommended to use phase change materials to store the excess thermal energy as a positive and effective approach to solving the energy problems.
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4

Morin, Gabriel, Jürgen Dersch, Werner Platzer, Markus Eck et Andreas Häberle. « Comparison of Linear Fresnel and Parabolic Trough Collector power plants ». Solar Energy 86, no 1 (janvier 2012) : 1–12. http://dx.doi.org/10.1016/j.solener.2011.06.020.

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5

Alayi, Reza, Mahdi Mohkam, Hossein Monfared, Alibek Issakhov et Nima Khalilpoor. « Modeling and Analysis of Energy/Exergy for Absorber Pipes of Linear Parabolic Concentrating Systems ». International Journal of Photoenergy 2021 (11 novembre 2021) : 1–10. http://dx.doi.org/10.1155/2021/7929756.

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In this paper, the physical parameters of the absorber pipe of a linear parabolic collector have been investigated. The types of solar collectors, specifically the linear parabolic collector, have been comprehensively studied. Then, the mathematical model of heat transfer in the absorber pipe of the collector has been presented based on valid references. Numerical solutions of the equations related to the absorber pipe were performed by MATLAB software, and the effects of the physical parameters of the absorber pipe on its efficiency were investigated. The results show that increasing the length of the absorber pipe causes a nonlinear decrease in the efficiency of the absorber pipe. One of the important results is the increase in fluid temperature due to the increase in the diameter of the adsorbent tube, which increases the diameter of the fluid temperature by 60 K, in which the parameter increases the efficiency by 0.38%.
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6

Natarajan, M., et T. Srinivas. « Design and analysis of a gravity-based passive tracking mechanism to a linear solar concentrating collector ». Proceedings of the Institution of Mechanical Engineers, Part C : Journal of Mechanical Engineering Science 231, no 13 (7 mars 2016) : 2503–14. http://dx.doi.org/10.1177/0954406216637634.

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A novel gravity-based power-free solar tracking mechanism has been developed to track a linear solar concentrating collector. Multireflector compound parabolic collectors having three parabolic segments and two flat surfaces is chosen due to its high intercept factor and suitability to the current tracking. The working of tracking mechanism is studied to find the tracking loads in the east and the west sides of collector. A generalized mathematical model is derived to simulate the tracking motion from the sunrise to sunset. The identified design variants are sprocket wheel diameter, spring stiffness, solar collector’s weight, counter balance, and tracking wheel radius. The spring length is derived from the constraints. To make a compact product, the tracking load has been minimized at large sprocket wheel, low stiff spring, lighter collector weight, and small radius of tracking. For a typical collector load of 50 kg, the designed tracking load is 50 kg with 620 mm spring length, 250 mm of sprocket wheel diameter and 60 mm tracking radius.
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Lillo-Bravo, Isidoro, Elena Pérez-Aparicio, Natividad Sancho-Caparrini et Manuel Silva-Pérez. « Benefits of Medium Temperature Solar Concentration Technologies as Thermal Energy Source of Industrial Processes in Spain ». Energies 11, no 11 (29 octobre 2018) : 2950. http://dx.doi.org/10.3390/en11112950.

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This paper analyses the possible applications of medium temperature solar concentration technologies, Compound Parabolic Collector, Linear Fresnel Collector and Parabolic Trough Collector in the Spanish industrial sector. Results of this study allow evaluating whether or not solar technologies are an alternative to conventional sources. This possibility is analyzed energetically, economically and environmentally. Results show that the percentage of solar use is decisive in determining the true thermal energy generation cost. The other essential parameter is the solar field area due to produce economy of scale that reduces investment costs. Fluid temperature has significant influence mainly in Compound Parabolic Collector technology. Results obtained in this paper collect multiple alternatives and allow comparing for different scenarios the suitability to replace conventional energy sources by thermal energy obtained from medium temperature solar concentration technologies from an economic perspective. For instance, for percentage of solar use equal to 100%, the lowest thermal energy generation costs for each technology are 1.3 c€/kWh for Compound Parabolic Collector technology, fluid temperature of 100 °C and industrial process located in Seville, 2.4 c€/kWh for Linear Fresnel Collector technology, fluid temperature of 170 °C and industrial process located in Jaen, 3.3 c€/kWh for technology, fluid temperature of 350 °C and industrial process located in Jaen. These costs are lower than conventional energy sources costs.
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8

Valizadeh, Mohammad, Faramarz Sarhaddi et Mohsen Mahdavi Adeli. « Exergy performance assessment of a linear parabolic trough photovoltaic thermal collector ». Renewable Energy 138 (août 2019) : 1028–41. http://dx.doi.org/10.1016/j.renene.2019.02.039.

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9

Francini, F., D. Fontani, P. Sansoni, L. Mercatelli, D. Jafrancesco et E. Sani. « Evaluation of Surface Slope Irregularity in Linear Parabolic Solar Collectors ». International Journal of Photoenergy 2012 (2012) : 1–6. http://dx.doi.org/10.1155/2012/921780.

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The paper describes a methodology, very simple in its application, for measuring surface irregularities of linear parabolic collectors. This technique was principally developed to be applied in cases where it is difficult to use cumbersome instruments and to facilitate logistic management. The instruments to be employed are a digital camera and a grating. If the reflector surface is defective, the image of the grating, reflected on the solar collector, appears distorted. Analyzing the reflected image, we can obtain the local slope of the defective surface. These profilometric tests are useful to identify and monitor the mirror portions under mechanical stress and to estimate the losses caused by the light rays deflected outside the absorber.
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10

Bretado de los Rios, Mariana Soledad, Carlos I. Rivera-Solorio et Alejandro J. García-Cuéllar. « Thermal performance of a parabolic trough linear collector using Al2O3/H2O nanofluids ». Renewable Energy 122 (juillet 2018) : 665–73. http://dx.doi.org/10.1016/j.renene.2018.01.094.

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11

Gharbi, Najla El, Halima Derbal, Sofiane Bouaichaoui et Noureddine Said. « A comparative study between parabolic trough collector and linear Fresnel reflector technologies ». Energy Procedia 6 (2011) : 565–72. http://dx.doi.org/10.1016/j.egypro.2011.05.065.

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12

Korres, Dimitrios, Evangelos Bellos et Christos Tzivanidis. « Integration of a Linear Cavity Receiver in an Asymmetric Compound Parabolic Collector ». Energies 15, no 22 (17 novembre 2022) : 8635. http://dx.doi.org/10.3390/en15228635.

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The objective of this work is the integration of a linear cavity receiver in an asymmetric compound parabolic collector. Two different numerical models were developed; one for the conventional geometry and one for the cavity configuration. Both models were examined for inlet temperatures from 20 °C up to 80 °C, considering water as the operating fluid with a typical volume flow rate of 15 lt/h. Emphasis was given to the comparison of the thermal and optical performance between the designs, as well as in the temperature levels of the fluids and the receiver. The geometry of the integrated cavity receiver was optimized according to two independent parameters and two possible optimum designs were finally revealed. The optimization took place regarding the optical performance of the collector with the cavity receiver. The simulation results indicated that the cavity design leads to enhancements of up to 4.40% and 4.00% in the optical and thermal efficiency respectively, while the minimum possible enhancement was above 2.20%. The mean enhancements in optical and thermal performance were found to be 2.90% and 2.92% respectively. Moreover, an analytical solution was developed for verifying the numerical results and the maximum deviations were found to be less than 5% in all the compared parameters. Especially, in thermal efficiency verification, the maximum deviation took a value of less than 0.5%. The design and the simulations in the present study were conducted with the SolidWorks Flow Simulation tool.
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13

Islam, Majedul, Prasad Yarlagadda et Azharul Karim. « Effect of the Orientation Schemes of the Energy Collection Element on the Optical Performance of a Parabolic Trough Concentrating Collector ». Energies 12, no 1 (31 décembre 2018) : 128. http://dx.doi.org/10.3390/en12010128.

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While the circular shape is currently the proven optimum design of the energy collection element (ECE) of a parabolic trough collector, that is yet to be confirmed for parabolic trough concentrating collectors (PTCCs) like trough concentrating photovoltaic collectors and hybrid photovoltaic/thermal collectors. Orientation scheme of the ECE is expected to have significant effect on the optical performance including the irradiance distribution around the ECE and the optical efficiency, and therefore, on the overall energy performance of the PTCC. However, little progress addressing this issue has been reported in the literature. In this study, a thorough investigation has been conducted to determine the effect of the orientation schemes of ECE on the optical performance of a PTCC applying a state-of-the-art Monte Carlo ray tracing (MCRT) technique. The orientation schemes considered are a flat rectangular target and a hollow circular, semi-circular, triangular, inverted triangular, rectangular and rectangle on semi-circle (RSc). The effect of ECE defocus, Sun tracking error and trough rim angle on the optical performance is also investigated. The MCRT study reveals that the ECE orientation schemes with a curved surface at the trough end showed much higher optical efficiency than those with a linear surface under ideal conditions. ECEs among the linear surface group, the inverted triangular orientation exhibited the highest optical efficiency, whereas the flat and triangular ones exhibited the lowest optical efficiency, and the rectangular one was in between them. In the event of defocus and tracking errors, a significant portion of the concentrated light was observed to be intercepted by the surfaces of the rectangular and RSc ECEs that are perpendicular to the trough aperture. This is an extended version of a published work by the current authors, which will help to design an optically efficient ECE for a parabolic trough concentrating collector.
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14

Karimi, Sadaghiyani, Azad Sadeghi, Sharam Khalilaria et Iraj Mirzaee. « Two new designs of parabolic solar collectors ». Thermal Science 18, suppl.2 (2014) : 323–34. http://dx.doi.org/10.2298/tsci111105089s.

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In this work, two new compound parabolic trough and dish solar collectors are presented with their working principles. First, the curves of mirrors are defined and the mathematical formulation as one analytical method is used to trace the sun rays and recognize the focus point. As a result of the ray tracing, the distribution of heat flux around the inner wall can be reached. Next, the heat fluxes are calculated versus several absorption coefficients. These heat flux distributions around absorber tube are functions of angle in polar coordinate system. Considering, the achieved heat flux distribution are used as a thermal boundary condition. After that, Finite Volume Methods (FVM) are applied for simulation of absorber tube. The validation of solving method is done by comparing with Dudley's results at Sandia National Research Laboratory. Also, in order to have a good comparison between LS-2 and two new designed collectors, some of their parameters are considered equal with together. These parameters are consist of: the aperture area, the measures of tube geometry, the thermal properties of absorber tube, the working fluid, the solar radiation intensity and the mass flow rate of LS-2 collector are applied for simulation of the new presented collectors. After the validation of the used numerical models, this method is applied to simulation of the new designed models. Finally, the outlet results of new designed collector are compared with LS-2 classic collector. Obviously, the obtained results from the comparison show the improving of the new designed parabolic collectors efficiency. In the best case-study, the improving of efficiency are about 10% and 20% for linear and convoluted models respectively.
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15

Ma, Jun, Cheng-Long Wang, Yuan Zhou et Rui-Dong Wang. « Optimized design of a linear Fresnel collector with a compound parabolic secondary reflector ». Renewable Energy 171 (juin 2021) : 141–48. http://dx.doi.org/10.1016/j.renene.2021.02.100.

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16

Zhu, Jie, et Hulin Huang. « Design and thermal performances of Semi-Parabolic Linear Fresnel Reflector solar concentration collector ». Energy Conversion and Management 77 (janvier 2014) : 733–37. http://dx.doi.org/10.1016/j.enconman.2013.10.015.

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17

Abbas, R., M. J. Montes, A. Rovira et J. M. Martínez-Val. « Parabolic trough collector or linear Fresnel collector ? A comparison of optical features including thermal quality based on commercial solutions ». Solar Energy 124 (février 2016) : 198–215. http://dx.doi.org/10.1016/j.solener.2015.11.039.

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18

Uzair, Muhammad, Naveed ur Rehman et Syed Ahmad Raza. « Probabilistic approach for estimating heat fluid exit temperature correlation in a linear parabolic trough solar collector ». Journal of Mechanical Science and Technology 32, no 1 (janvier 2018) : 447–53. http://dx.doi.org/10.1007/s12206-017-1245-3.

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19

Díaz - Salgado, Jorge, Sandra García - López, Yuridiana R. Galindo - Luna et R. J. Romero. « Parametric Identification Method for an Absorption Air Conditioning Parabolic Trough Collector Solar Plant ». International Journal of Basic and Applied Sciences 9, no 4 (23 décembre 2020) : 01. http://dx.doi.org/10.14419/ijbas.v9i4.31273.

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In this work is established a parametric identification method for an absorption air conditioning solar plant. A scaled thermal plant, consisting of a thermal capacitor and a flow line that acts as a capacitor and thermal energy radiator is used. As the mathematical model of the scaled plant is structurally identical to that of the solar plant the first is used to determine the methodology that can be used later for the identification of the PTC solar plant. Parametric identification is a necessary step that allows to determine the unknown parameters of the mathematical model of any solar/thermal plant. This model then can be used to analyze the plant characteristics and design an appropriate control algorithm. Although the system model is nonlinear it can be expressed in the form of a linear regressor in the parameters. This permits to use the least squares method as the identification method. The method is applied to the thermal plant to identify the useful form that the covariance matrix and excitation signals should have to ensure that when applied to the solar plant its unknown parameters can be properly estimated. Once the solar plant parameters are properly estimated model can be used to analyze and simulate the operation of the absorption air conditioning system.
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20

Xiao, X., P. Zhang, D. D. Shao et M. Li. « Experimental and numerical heat transfer analysis of a V-cavity absorber for linear parabolic trough solar collector ». Energy Conversion and Management 86 (octobre 2014) : 49–59. http://dx.doi.org/10.1016/j.enconman.2014.05.001.

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21

Abbas, R., M. Valdés, M. J. Montes et J. M. Martínez-Val. « Design of an innovative linear Fresnel collector by means of optical performance optimization : A comparison with parabolic trough collectors for different latitudes ». Solar Energy 153 (septembre 2017) : 459–70. http://dx.doi.org/10.1016/j.solener.2017.05.047.

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22

Feuermann, D., et J. M. Gordon. « Analysis of a Two-Stage Linear Fresnel Reflector Solar Concentrator ». Journal of Solar Energy Engineering 113, no 4 (1 novembre 1991) : 272–79. http://dx.doi.org/10.1115/1.2929973.

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The two-stage linear Fresnel reflector solar concentrator is analyzed via an in-depth study of an installed, nominally 220 KWt system. The concentrator includes: (1) a primary linear Fresnel reflector comprised of curved mirrors and (2) a secondary nonimaging CPC-type trough with a tubular receiver. The principal practical design options for the secondary concentrator are evaluated. Via a computer simulation which includes ray-tracing of the primary reflector, we evaluate the sensitivity of energy output to: concentrator optical errors, system geometry, tracking mode, and the option of using flat versus curved primary mirrors. The two-stage Fresnel concentrator can be considerably less expensive than the corresponding parabolic trough collector, but is found to deliver about one-fourth less yearly energy. However, much of this difference could be eliminated through the use of higher-quality CPC reflectors.
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23

Sun, Jie, Zhi Zhang, Li Wang, Zhenwen Zhang et Jinjia Wei. « Comprehensive Review of Line-Focus Concentrating Solar Thermal Technologies : Parabolic Trough Collector (PTC) vs Linear Fresnel Reflector (LFR) ». Journal of Thermal Science 29, no 5 (20 août 2020) : 1097–124. http://dx.doi.org/10.1007/s11630-020-1365-4.

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24

Kincaid, Nicholas, Greg Mungas, Nicholas Kramer, Michael Wagner et Guangdong Zhu. « An optical performance comparison of three concentrating solar power collector designs in linear Fresnel, parabolic trough, and central receiver ». Applied Energy 231 (décembre 2018) : 1109–21. http://dx.doi.org/10.1016/j.apenergy.2018.09.153.

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25

Chen, Tzu-Chia, Rustam Rashidov, Mark Treve, Ahmed B. Mahdi, Ali Thaeer Hammid, Abduladheem Turki Jalil et Ali Shamel. « Cooling, heating and power system ». International Journal of Low-Carbon Technologies 18 (2023) : 1–12. http://dx.doi.org/10.1093/ijlct/ctac122.

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Abstract Systems of cogeneration of cooling, heating and electric power with renewable energy sources are a very suitable solution for the independency of fossil fuels and reducing the emission of environmental pollutants. In this research, an internal combustion engine with a boiler and a linear parabolic concentrating collector has been used to realize the production of electrical and thermal energy. That the internal combustion engine is responsible for the production of electric power, which is responsible for the thermal energy by the concentrated linear collector with the boiler and the heat exchanger. Due to the need for thermal energy at different times, a thermal storage tank has been used in such a way that the thermal energy produced by the solar collector and boiler is stored in the tank to supply the load at the required times. The results show that the total cost of final products for one day of the hottest month of summer in the proposed thermal power plant with fossil fuel will be $69.3 and $63.5, respectively, and for 1 day of the coldest month of winter, the total cost of producing final products in the proposed and fossil system will be $31.6 and $28.5, respectively.
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Jamshed, Wasim, Ceylin Şirin, Fatih Selimefendigil, MD Shamshuddin, Yasir Altowairqi et Mohamed R. Eid. « Thermal Characterization of Coolant Maxwell Type Nanofluid Flowing in Parabolic Trough Solar Collector (PTSC) Used Inside Solar Powered Ship Application ». Coatings 11, no 12 (17 décembre 2021) : 1552. http://dx.doi.org/10.3390/coatings11121552.

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Parabolic trough solar collectors (PTSCs) are generally utilized to reach high temperatures in solar-thermal applications. The current work investigates entropy production analysis and the influence of nano solid particles on a parabolic trough surface collector (PTSC) installed within a solar powered ship (SPS). For the current investigation, the non-Newtonian Maxwell type, as well as a porous medium and Darcy–Forchheimer effects, were used. The flow in PTSC was produced by a nonlinear stretching surface, and the Cattaneo–Christov approach was used to assess the thermal boundary layer’s heat flux. Similarity transformation approach has been employed to convert partial differential equations into solvable ordinary differential equations allied to boundary conditions. Partial differential and the boundary conditions have been reduced into a group of non-linear ordinary differential equations. A Keller-box scheme applied to solve approximate solutions of the ordinary differential equations. Single-walled carbon nanotubes -engine oil (SWCNT-EO) and Multiwalled carbon nanotubes/engine oil (MWCNT-EO) nanofluids have been utilized as working fluid. According to the findings, the magnetic parameter led to a reduction in the Nusselt number, as well as an increment in skin friction coefficient. Moreover, total entropy variance over the domain enhanced for flow rates through Reynolds number and viscosity fluctuations were monitored by using Brinkman number. Utilizing SWCNT-EO nanofluid increased the thermal efficiency between 1.6–14.9% in comparison to MWCNT-EO.
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Filali Baba, Yousra, Ahmed Al Mers, Tauseef -ur-Rehman, Hamid Ajdad, Abdelfattah Bouatem, Abdessamad Faik et Badr Bououlid Idrissi. « No-vacuum Mono-Tube Compound Parabolic Collector Receiver for Linear Fresnel Concentrator : Numerical and Experimental Approach for Dynamic Behavior Assessment ». Energy Conversion and Management 268 (septembre 2022) : 115986. http://dx.doi.org/10.1016/j.enconman.2022.115986.

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Yadav, Pankaj, Brijesh Tripathi et Manoj Kumar. « Exergy, Energy, and Dynamic Parameter Analysis of Indigenously Developed Low-Concentration Photovoltaic System ». International Journal of Photoenergy 2013 (2013) : 1–12. http://dx.doi.org/10.1155/2013/929235.

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Piecewise linear parabolic trough collector (PLPTC) is designed and developed to concentrate solar radiation on monocrystalline silicon based photovoltaic module. A theoretical model is used to perform electrical energy and exergy analysis of low-concentration photovoltaic (LCPV) system working under actual test conditions (ATC). The exergy efficiency of LCPV system is in the range from 5.1% to 4.82% with increasing rate of input exergy rate from 30.81 W to 96.12 W, when concentration ratio changes from 1.85 to 5.17 Sun. Short-circuit current shows increasing trend with increasing input exergy rate of≈0.011 A/W. Power conversion efficiency decreases from 7.07 to 5.66%, and open-circuit voltage decreases from 9.86 to 8.24 V with temperature coefficient of voltage≈-0.021 V/K under ATC. The results confirm that the commercially available silicon solar PV module performs satisfactorily under low concentration.
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Liu, Jun, Renfu Li, Yuxuan Chen, Jianguo Zheng et Kun Wang. « Topology Optimization Method of a Cavity Receiver and Built-In Net-Based Flow Channels for a Solar Parabolic Dish Collector ». Entropy 25, no 3 (22 février 2023) : 398. http://dx.doi.org/10.3390/e25030398.

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The design of a thermal cavity receiver and the arrangement of the fluid flow layout within it are critical in the construction of solar parabolic dish collectors, involving the prediction of the thermal–fluid physical field of the receiver and optimization design. However, the thermal–fluid analysis coupled with a heat loss model of the receiver is a non-linear and computationally intensive solving process that incurs high computational costs in the optimization procedure. To address this, we implement a net-based thermal–fluid model that incorporates heat loss analysis to describe the receiver’s flow and heat transfer processes, reducing computational costs. The physical field results of the net-based thermal–fluid model are compared with those of the numerical simulation, enabling us to verify the accuracy of the established thermal–fluid model. Additionally, based on the developed thermal–fluid model, a topology optimization method that employs a genetic algorithm (GA) is developed to design the cavity receiver and its built-in net-based flow channels. Using the established optimization method, single-objective and multi-objective optimization experiments are conducted under inhomogeneous heat flux conditions, with objectives including maximizing temperature uniformity and thermal efficiency, as well as minimizing the pressure drop. The results reveal varying topological characteristics for different optimization objectives. In comparison with the reference design (spiral channel) under the same conditions, the multi-objective optimization results exhibit superior comprehensive performance.
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Mustafa, Jawed, Saeed Alqaed, Mohsen Sharifpur et Shahid Husain. « The effect of using multichannel twisted tape and nanofluid on the absorber tube's heat transfer and the efficiency of a linear parabolic solar collector ». Sustainable Energy Technologies and Assessments 52 (août 2022) : 102329. http://dx.doi.org/10.1016/j.seta.2022.102329.

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Rawani, Atwari, S. P. Sharma, K. D. P. Singh et Kumari Namarata. « Analytical modeling of parabolic linear collectors for solar power plant ». Journal of Mechanical Science and Technology 32, no 10 (octobre 2018) : 4993–5004. http://dx.doi.org/10.1007/s12206-018-0947-5.

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32

Rolim, Milton Matos, Naum Fraidenraich et Chigueru Tiba. « Analytic modeling of a solar power plant with parabolic linear collectors ». Solar Energy 83, no 1 (janvier 2009) : 126–33. http://dx.doi.org/10.1016/j.solener.2008.07.018.

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33

Bellos, Evangelos, et Christos Tzivanidis. « Concentrating Solar Collectors for a Trigeneration System—A Comparative Study ». Applied Sciences 10, no 13 (29 juin 2020) : 4492. http://dx.doi.org/10.3390/app10134492.

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The objective of this study is the investigation of different solar concentrating collectors for application in a trigeneration system. Parabolic trough collectors, linear Fresnel reflectors and solar dishes are the examined solar concentrating technologies in this work. The trigeneration unit includes an organic Rankine cycle coupled with an absorption heat machine that operates with LiBr/water. The analysis is performed throughout the year by using the weather data of Athens in Greece. The results of this work indicate that the selection of parabolic trough collectors is the best choice because it leads to the maximum yearly system energy efficiency of 64.40% and to the minimum simple payback period of 6.25 years. The second technology is the solar dish with the energy efficiency of 62.41% and the simple payback period of 6.95 years, while the linear Fresnel reflector is the less efficient technology with the energy efficiency of 35.78% and with a simple payback period of 10.92 years. Lastly, it must be stated that the thermodynamic investigation of the system is performed with a created model in Engineering Equation Solver, while the dynamic analysis is performed with a code in the programming language FORTRAN.
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Li, Xueling, Huawei Chang, Chen Duan, Yao Zheng et Shuiming Shu. « Thermal performance analysis of a novel linear cavity receiver for parabolic trough solar collectors ». Applied Energy 237 (mars 2019) : 431–39. http://dx.doi.org/10.1016/j.apenergy.2019.01.014.

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Ahlgren, Benjamin, Zhiyong Tian, Bengt Perers, Janne Dragsted, Emma Johansson, Kajsa Lundberg, Jonatan Mossegård, Joakim Byström et Olle Olsson. « A simplified model for linear correlation between annual yield and DNI for parabolic trough collectors ». Energy Conversion and Management 174 (octobre 2018) : 295–308. http://dx.doi.org/10.1016/j.enconman.2018.08.008.

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Cau, Giorgio, et Daniele Cocco. « Comparison of Medium-size Concentrating Solar Power Plants based on Parabolic Trough and Linear Fresnel Collectors ». Energy Procedia 45 (2014) : 101–10. http://dx.doi.org/10.1016/j.egypro.2014.01.012.

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Ghodbane, Mokhtar, Djamel Benmenine, Abderrahmane Khechekhouche et Boussad Boumeddane. « Brief on Solar Concentrators : Differences and Applications ». Instrumentation Mesure Métrologie 19, no 5 (15 novembre 2020) : 371–78. http://dx.doi.org/10.18280/i2m.190507.

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In light of the global crises that the world suffers from, the renewable energy exploitation is a viable solution to remedy the various energy crises, knowing that renewable energy is a source of environmental credibility, as it does not cause any pollution or any emissions harmful to the environment. Among the most important renewable energy sources, solar energy is the most important type as it can be exploited thermally by adopting various solar collectors, especially solar concentrators. This paper has been devoted to illustrate the types of solar concentrators, namely point-focus concentrators (Heliostat Field Collectors and Parabolic Dish Collectors) and linear concentrators (Linear Fresnel Reflectors and Parabolic Trough Collectors), in an attempt to clarify its principle and its multiple uses domestically and industrially, especially in areas that are characterized by the abundance of its direct solar radiation. The solar concentrator is a solar thermal energy concentration system, because its use reduces the consumption of fossil fuels harmful to the environment and directly contributes to climate change. Solar thermal concentrators are an effective alternative to fossil generators for thermal energy, as they have many important uses such as the solar electricity production of solar electricity in power plants, industrial and domestic water heating, and have many other industrial uses.
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Cocco, Daniele, et Giorgio Cau. « Energy and economic analysis of concentrating solar power plants based on parabolic trough and linear Fresnel collectors ». Proceedings of the Institution of Mechanical Engineers, Part A : Journal of Power and Energy 229, no 6 (20 mai 2015) : 677–88. http://dx.doi.org/10.1177/0957650915587433.

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Desai, Nishith B., et Santanu Bandyopadhyay. « Integration of parabolic trough and linear Fresnel collectors for optimum design of concentrating solar thermal power plant ». Clean Technologies and Environmental Policy 17, no 7 (20 février 2015) : 1945–61. http://dx.doi.org/10.1007/s10098-015-0918-9.

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Gopinath, S. « Design of 20m2 Parabolic Trough Solar Thermal Collector (PTSC) and using Linaer Actuator for Single Axis Tracking ». International Journal for Research in Applied Science and Engineering Technology 9, no 4 (30 avril 2021) : 1346–50. http://dx.doi.org/10.22214/ijraset.2021.33845.

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López, Juan Camilo, Alejandro Escobar, Daniel Alejandro Cárdenas et Álvaro Restrepo. « Parabolic trough or linear fresnel solar collectors ? An exergy comparison of a solar-assisted sugarcane cogeneration power plant ». Renewable Energy 165 (mars 2021) : 139–50. http://dx.doi.org/10.1016/j.renene.2020.10.138.

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Amelio, Mario, Vittorio Ferraro, Valerio Marinelli et Antonio Summaria. « An evaluation of the performance of an integrated solar combined cycle plant provided with air-linear parabolic collectors ». Energy 69 (mai 2014) : 742–48. http://dx.doi.org/10.1016/j.energy.2014.03.068.

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Hashemi, Neda Mohammad, Morteza Abdolzadeh et Mohammad Rahnama. « Techno‐economic analysis of applying linear parabolic and flat plate solar collectors for heating a building and their comparative evaluation ». Environmental Progress & ; Sustainable Energy 38, no 4 (4 février 2019) : 13121. http://dx.doi.org/10.1002/ep.13121.

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Norton, B., P. C. Eames et Y. P. Yadav. « Symmetric and asymmetric linear compound parabolic concentrating solar energy collectors : The state-of-the-art in optical and thermo-physical analysis ». International Journal of Ambient Energy 12, no 4 (octobre 1991) : 171–90. http://dx.doi.org/10.1080/01430750.1991.9675201.

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Kruglyak, Yuriy. « Landauer-Datta-Lundstrom Generalized Transport Model for Nanoelectronics ». Journal of Nanoscience 2014 (17 septembre 2014) : 1–15. http://dx.doi.org/10.1155/2014/725420.

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The Landauer-Datta-Lundstrom electron transport model is briefly summarized. If a band structure is given, the number of conduction modes can be evaluated and if a model for a mean-free-path for backscattering can be established, then the near-equilibrium thermoelectric transport coefficients can be calculated using the final expressions listed below for 1D, 2D, and 3D resistors in ballistic, quasiballistic, and diffusive linear response regimes when there are differences in both voltage and temperature across the device. The final expressions of thermoelectric transport coefficients through the Fermi-Dirac integrals are collected for 1D, 2D, and 3D semiconductors with parabolic band structure and for 2D graphene linear dispersion in ballistic and diffusive regimes with the power law scattering.
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Ferraro, Vittorio, Valerio Marinelli et Jessica Settino. « A simplified calculation method for the evaluation of the performance of a hybrid solar plant with linear parabolic collectors and Joule-Brayton air cycle ». TECNICA ITALIANA-Italian Journal of Engineering Science 61+1, no 2 (30 décembre 2018) : 166–72. http://dx.doi.org/10.18280/ti-ijes.620216.

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de Sousa Torres, Guilherme, Tulio Andre Pereira de Oliveira, Anesio de Leles Ferreira Filho, Fernando Cardoso Melo et Elder Geraldo Domingues. « Techno-Economic Assessment of Concentrated Solar and Photovoltaic Power Plants in Brazil ». Renewable Energy and Power Quality Journal 19 (septembre 2021) : 583–88. http://dx.doi.org/10.24084/repqj19.353.

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The need for a diverse energy matrix has been promoting a favorable environment for integrating new renewable energy sources, such as Concentrated Solar Power plants (CSPs). Nonetheless, as a consequence of the incipient solar generation via CSPs in Brazil, there is a unsatisfactory number of researches that handle technical and economic assessments of CSP plants performance on this country. Given this scenario, this study proposes an assessment of the technoeconomic viability of the implementation of 100 MW CSP plants in Brazil, considering the Solar Tower (ST) systems, Parabolic Trough Collectors (PTC), Linear Fresnel (LFR) Reflectors and Dish Stirling (DS) Systems, and comparing the results to a photovoltaic (PV) plant. This study utilizes project data of power plants collected from the relevant literature and applies it to the city of Bom Jesus da Lapa, Brazil. The CSP techno-economic viability is evaluated through the analysis of the annual energy generated, as well as the economic viability indicators, such as the Net Present Value, the Internal Rate of Return, the Discounted Payback and the Levelized Cost of Energy, and through a single-variable sensitivity analysis. This analysis employs the discounted cash flow model, considering the energy trade in a Regulated Contracting Environment
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Al-Dohani, Nawar Saif, S. Nayak Nagaraj, A. Anarghya et V. N. Abhishek. « Development of Powerhouse Using Fresnel lens ». MATEC Web of Conferences 144 (2018) : 04006. http://dx.doi.org/10.1051/matecconf/201814404006.

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Solar energy is an alternative source of renewable energy. Sultanate of Oman government showed initiation on utilization of solar energy for domestic and industrial applications. Fresnel lens is one of the methods to collect maximum energy by gathering heat of the sun in the concentrated form (using solar collectors). Earlier research work discloses that Fresnel lens gave better result in terms of power output and produces lower heat loss as compared to linear –parabolic solar collectors. In this work, development of a proto Fresnel lens power house was made to generate electricity. The focused heat from Fresnel lens was used to heat the molten salt in a heat exchanger to produce the steam. The generated steam was used to rotate the steam engine coupled to a generator. In the current work, a maximum power of 30 W was produced. In addition, comparative study was carried out regarding solar salts and heat exchanger materials to understand the Fresnel powerhouse performance. Overall the present study gave valuable information regarding usage of Fresnel lens for electricity generation in Oman.
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Rotko, V. V. « INVERSE PROBLEMS FOR MATHEMATICAL MODELS WITH THE POINTWISE OVERDETERMINATION ». Yugra State University Bulletin 14, no 3 (15 décembre 2018) : 57–66. http://dx.doi.org/10.17816/byusu2018057-66.

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In the article we examine well-posedness questions in the Sobolev spaces of an inverse source problem in the case of a quasilinear parabolic system of the second order. These problem arise when describing heat and mass transfer, diffusion, filtration, and in many other fields. The main part of the operator is linear. The unknowns occur in the nonlinear right-hand side. In particular, this class of problems includes the coefficient inverse problems on determinations of the lower order coefficients in a parabolic equation or a system. The overdetermination conditions are the values of a solution at some collection of points lying inside the spacial domain. The Dirichlet and oblique derivative problems under consideration. The problems are studied in a bounded domain with smooth boundary. However, the results can be generalized to the case of unbounded domains as well for which the corresponding solvability theorems hold. The conditions ensuring local (in time) well-posedness of the problem in the Sobolev classes are exposed. The conditions on the data are minimal. The results are sharp. The problem is reduced to an operator equation whose solvability is proven with the use of a priori bounds and the fixed point theorem. A solution possesses all generalize derivatives occurring in the system which belong to the space with and some additional necessary smoothness in some neighborhood about the overdetermination points.
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ALVARADO, ALEJANDRA, et EDRAY HERBER GOINS. « ARITHMETIC PROGRESSIONS ON CONIC SECTIONS ». International Journal of Number Theory 09, no 06 (septembre 2013) : 1379–93. http://dx.doi.org/10.1142/s1793042113500322.

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The set {1, 25, 49} is a 3-term collection of integers which forms an arithmetic progression of perfect squares. We view the set {(1, 1), (5, 25), (7, 49)} as a 3-term collection of rational points on the parabola y = x2 whose y-coordinates form an arithmetic progression. In this exposition, we provide a generalization to 3-term arithmetic progressions on arbitrary conic sections [Formula: see text] with respect to a linear rational map [Formula: see text]. We explain how this construction is related to rational points on the universal elliptic curve Y2 + 4XY + 4kY = X3 + kX2 classifying those curves possessing a rational 4-torsion point.
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