The Experts below are selected from a list of 177 Experts worldwide ranked by ideXlab platform
Dae Hyun Kim - One of the best experts on this subject based on the ideXlab platform.
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Simulation and model validation of sheet and tube type photovoltaic Thermal Solar System and conventional Solar collecting System in transient states
Solar Energy Materials and Solar Cells, 2012Co-Authors: Sujala Bhattarai, Seung-hee Euh, Gopi Krishna Kafle, Dae Hyun KimAbstract:This study presents a one-dimensional mathematical model for simulating the transient processes of sheet and tube type photovoltaic/Thermal (PV/T) System and conventional type Solar collectors. The models are based on the energy conservation for the glass cover, PV plate, absorber plate, tube, water in the tube and storage tank for the PV/T and the same layers excluding PV plate in conventional Solar collector. The models were all first order ordinary differential equations which could be easily solved in the Matlab computer program using ode solvers. For the purpose of validating the proposed methods, performance tests were done on the both Systems. Satisfactory convergences were found between the measured data and calculated results. The statistical analysis was performed for the scientific validation of the results. The current model is suitable for the single cover tube type PV/T Systems.
Abdelmajid Jemni - One of the best experts on this subject based on the ideXlab platform.
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Numerical and model validation of uncovered nanofluid sheet and tube type photovoltaic Thermal Solar System
Energy Conversion and Management, 2016Co-Authors: Oussama Rejeb, Mohammad Sardarabadi, Christophe Menezo, Mohammad Passandideh-fard, Mohamed Houcine Dhaou, Abdelmajid JemniAbstract:Abstract In this paper, an experimental and numerical study is performed to evaluate the performance of a photovoltaic Thermal (PV/T) nanofluid based collector. A two-dimensional numerical model is established to study the effects of using nanofluids as working fluid in PV/T collector. The model is validated experimentally by comparing the simulations with the experimental results. The influence of concentration (0.1, 0.2 and 0.4 wt.%), types of nanoparticles (Al2O3 and Cu) and different base fluids (pure water and ethylene glycol) on the electrical and Thermal performance of the collector is investigated. Also, the model is applied to predict the annual electrical and Thermal output of the PV/T for three different cities: Lyon (France), Mashhad (Iran) and Monastir (Tunisia). The results indicated that using pure water as a base fluid provides a higher performance in comparison with ethylene glycol. Using Cu/water gives the best Thermal and electrical efficiency in comparison to Cu/ethylene glycol, Al2O3/water and Al2O3/ethylene glycol. It is also found that the Thermal and electrical energy output for Monastir (Tunisia) climate condition is higher than that of Mashhad (Iran) and Lyon (France).
M. Ruiz De Adana - One of the best experts on this subject based on the ideXlab platform.
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Experimental energy performance assessment of a Solar desiccant cooling System in Southern Europe climates
Applied Thermal Engineering, 2020Co-Authors: F. Comino, J. Castillo González, F.j. Navas-martos, M. Ruiz De AdanaAbstract:Abstract Solar desiccant cooling Systems, SDEC, could be an effective alternative to conventional cooling Systems, which mainly depend on electrical energy. The main objective of this work was to determine experimentally the seasonal coefficient of performance, SCOP, of a SDEC System composed of a desiccant wheel, an indirect evaporative cooler and a Thermal Solar System, to control indoor conditions in a research lab room. The dependence of coefficient of performance on outdoor air conditions and percentage of renewable energy used by the SDEC System were also analysed. Experimental tests were carried out for six weeks during spring and summer seasons in Martos, Spain. The experimental results showed that the SDEC System independently adjusted the temperature and humidity of the supply air. 75% of the energy consumed by this air handling System comes from renewable sources. A seasonal coefficient of performance of the SDEC System of 2 was obtained for the period analysed. It is shown that the higher the outdoor temperature, the higher instantaneous COPs is. These results suggest that the use of SDEC Systems in hot climates, such as southern European climates, could contribute to achieve the EU's energy goals within the frame of Nearly Zero Energy Buildings.
Sujala Bhattarai - One of the best experts on this subject based on the ideXlab platform.
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Simulation and model validation of sheet and tube type photovoltaic Thermal Solar System and conventional Solar collecting System in transient states
Solar Energy Materials and Solar Cells, 2012Co-Authors: Sujala Bhattarai, Seung-hee Euh, Gopi Krishna Kafle, Dae Hyun KimAbstract:This study presents a one-dimensional mathematical model for simulating the transient processes of sheet and tube type photovoltaic/Thermal (PV/T) System and conventional type Solar collectors. The models are based on the energy conservation for the glass cover, PV plate, absorber plate, tube, water in the tube and storage tank for the PV/T and the same layers excluding PV plate in conventional Solar collector. The models were all first order ordinary differential equations which could be easily solved in the Matlab computer program using ode solvers. For the purpose of validating the proposed methods, performance tests were done on the both Systems. Satisfactory convergences were found between the measured data and calculated results. The statistical analysis was performed for the scientific validation of the results. The current model is suitable for the single cover tube type PV/T Systems.
Mohammad Behshad Shafii - One of the best experts on this subject based on the ideXlab platform.
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Numerical simulation of a concentrating photovoltaic-Thermal Solar System combined with thermoelectric modules by coupling Finite Volume and Monte Carlo Ray-Tracing methods
Energy Conversion and Management, 2018Co-Authors: Mehran Shadmehri, Hamid Narei, Roghayeh Ghasempour, Mohammad Behshad ShafiiAbstract:Abstract During the last decades, the adoption of more strict safety and environmental regulations, as well as a rise in energy costs, sparked an increasing interest in the design of renewable energies Systems, particularly Solar Systems, to supply both electrical power and heat. Because of their capability to simultaneously supply both electricity and heat, concentrating photovoltaic-Thermal and thermoelectric hybrid Systems have recently attracted scholarly attention. In this study, a detailed three-dimensional computational model of a novel concentrating photovoltaic-Thermal Solar System combined with thermoelectric modules in an integrated design with a triangular absorber and corresponding numerical simulations are presented. For this purpose, a three-dimensional integrated model combined the Finite Volume method with the Monte Carlo Ray-Tracing method is employed. After validating simulation results and providing some discussions on the effects of temperature and cooling on the photovoltaic modules performance, the impacts of varying two design parameters of the System, the aperture width of the reflector and the apex angle of the absorber, on the Solar energy flux distribution and output power of photovoltaic modules are discussed. Finally, considering the conditions of the case study, a range of aperture widths for the reflector and apex angles for the triangular absorber are proposed.
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A novel concentrating photovoltaic/Thermal Solar System combined with thermoelectric module in an integrated design
Renewable Energy, 2017Co-Authors: Milad Mohsenzadeh, Mohammad Behshad Shafii, H. Jafari MoslehAbstract:Abstract The use of Solar energy concentration Systems for achieving performance enhancements in the Photovoltaic/Thermal hybrid Solar Systems and reduction of initial costs is an idea that has been studied for years. In this article a new structure for parabolic trough photovoltaic/Thermal collector is proposed and its Thermal and electrical performances are experimentally investigated. The receiver of this concentrator contains a triangular channel with an outer surface covered with photovoltaic cells and thermoelectric modules with a specific arrangement so that in addition to absorbing heat, a larger portion of the Solar radiation is directly converted to electricity. Hence, the performance of the System is enhanced. Performance evaluation of this combined heat and power System that is equipped with one-axis Solar tracker in polar mechanism shows that daily average electrical and Thermal efficiencies can reach 4.83% and 46.16%, respectively. In addition, the electricity generation capacity of the photovoltaic module applied to this System has become fourfold in comparison with its standard working conditions. As a result, besides simultaneous generation of heat and electricity, the proposed model has a satisfactory performance.