Steady state operation exergy‐based optimization for solar thermal collectors (original) (raw)
2019, Environmental progress & sustainable energy
In this investigation, exergy based optimization was carried out on two configurations of solar thermal collectors. A set of control sensors were utilized to control the performance of the system and monitor the design variables, i.e. inlet and outlet temperature of the solar fluid, ambient temperature, incident solar flux, and required mechanical and electrical work in the system. The fluid temperature was considered to vary in the range of 120-180 ºC with respect to technical and economic considerations. The collector surface area was considered 606 m 2 in both configurations and a medium solar incident was considered about 520 W/m 2. The maximum acceptable temperature difference is obtained as function of the input temperature. The technical limitation is plotted for both configurations of solar collectors. It was noticed that the exergy flow of simple evacuated tubes can reach the maximum value when the input temperature is greater than 115°C for an incident solar flow, from 250W/m² up to the limit of 950 W/m². Exergy analysis demonstrated
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