Optimal control of flow in solar collectors for maximum exergy extraction |
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| Affiliation: | 1. Universidade Federal de Santa Catarina, Departamento de Automação e Sistemas, 88040-900 Florianópolis, SC, Brazil;2. Dpto. de Informática, Universidad de Almería - CIESOL, Campus de Excelencia Internacional Agroalimentario, ceiA3. Crta. Sacramento s/n, 04120 La Cañada, Spain;1. Departamento de Ingeniería de Sistemas y Automática, Universidad de Sevilla, Camino de los Descubrimientos s/n., 41092 Sevilla, Spain;2. Centro Mixto CIESOL, ceiA3, Departamento de Informática, Universidad de Almería. Ctra. Sacramento s/n, 04120, Almería, Spain;1. Departamento de Automação e Sistemas, Universidade Federal de Santa Catarina, Caixa Postal 476, CEP 88040-900, Florianópolis, Santa Catarina, Brasil;2. Departamento de Engenharia Elétrica, Universidade Federal da Bahia, N. 02, CEP 40210-630, Salvador, Bahia, Brasil |
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| Abstract: | The best operation strategies for open loop flat-plate solar collector systems are considered. A direct optimal control method (the TOMP algorithm) is implemented. A detailed collector model and realistic meteorological data from both cold and warm seasons are used in applications. The maximum exergetic efficiency is low (usually less than 3%), in good agreement with experimental measurements reported in literature. The optimum mass-flow rate increases near sunrise and sunset and by increasing the fluid inlet temperature. The optimum mass-flow rate is well correlated with global solar irradiance during the warm season. Also, operation at a properly defined constant mass-flow rate may be close to the optimal operation. |
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