Analysis of refrigerant-charged solar collectors with phase change |
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| Institution: | 1. Universidade Católica Portuguesa, CBQF – Centro de Biotecnologia e Química Fina – Laboratório Associado, Escola Superior de Biotecnologia, Rua Diogo Botelho, 1327, 4169-005, Porto, Portugal;2. REQUIMTE - LAQV, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007, Porto, Portugal;3. REQUIMTE - LAQV, Instituto de Ciências Biomédicas de Abel Salazar, Universidade do Porto, Rua de Jorge Viterbo Ferreira, 228, 4050-313, Porto, Portugal;1. Department of Chemical Engineering, University of Guanajuato, DCNE, Col. Noria Alta s/n, C.P. 36050, Guanajuato, Gto., Mexico;2. Department of Mechanical Engineering, University of Guanajuato, DICIS, Carretera Salamanca-Valle de Santiago Km. 3.5+1.8, C.P. 36885, Comunidad de Palo Blanco, Salamanca, Gto., Mexico |
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| Abstract: | This paper presents a mathematical model for natural circulation refrigerant-charged solar collector plates with phase change. The model accounts for the thermal nonequilibrium vapor generation process along fully charged collector tubes.The local vapor generation rate is determined by solving the steady one-dimensional two-phase energy conservation equations in finite difference form along the flow path. The integral momentum balance around the circulation loop determines the circulation flow rate, which shows dependency on the solar flux and the pressure of the heat carrying refrigerant inside the loop. Calculations have been made for a system fully charged by R-11, with temperature-dependent thermophysical properties.The effect of solar insolation, for a controlled pressure system, on the vaquality, ad circulation rate is presented and discussed. Performance of the system is studied for a range of the independent variables, solar flux up to 1000 W m−2, and refrigerant saturations temperatures up to 80°C. |
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