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Improved solutions for temperature and thermal power delivery profiles in linear solar collectors |
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| Authors: | Naum Fraidenraich J.M Gordon Rita de Cassia Fernandes de Lima |
| Affiliation: | aNuclear Energy Department, Universidade Federal de Pernambuco, Av. Prof. Luiz Freire, 1000 – Cidade Universitária, 50.740-540 Recife-PE, Brazil;bCenter for Energy and Environmental Physics, Jacob Blaustein Institute for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus 84990, Israel and The Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beersheva 84105, Israel (E-mail: jeff@menix.bgu.ac.il);cMechanical Engineering Department, Universidade Federal de Pernambuco, Av. Prof. Luiz Freire, 1000 – Cidade Universitária, 50.740-540 Recife-PE, Brazil |
| Abstract: | For the conversion of absorbed sunlight into useful thermal power, we demonstrate that the profiles of absorber temperature, fluid temperature and thermal power delivery along linear solar collectors can be solved in closed form even when the collector heat-loss coefficient is far from constant over the collector operating range. This analytic solution eliminates the errors inherent in earlier approximate solutions, and makes the dependence of collector performance on component properties transparent. An example for a realistic solar concentrator illustrates the improvement in prediction accuracy. |
| Keywords: | Solar collectors Solar power generation Heat losses Solar absorbers Numerical analysis Thermal power delivery profile Absorber temperature profile |
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