International Journal of Energy and Environmental Engineering | VOL. 8
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Energetic and exergetic investigation of a parabolic trough collector with internal fins operating with carbon dioxide

Publication Date Feb 15, 2017

Abstract

The objective of this study is to determine the energetic and exergetic enhancement of parabolic trough collector with internal fins in the absorber. Carbon dioxide is the examined working fluid to investigate the performance of the system in high temperature levels. In the first part of this study, the impact of the mass flow rate on the collector performance is analyzed and finally 0.20\xa0kg/s is selected as the most appropriate mass flow rate exergetically. In the second part, the impact of internal fins on the system performance is investigated for operation with the optimum mass flow rate. More specifically, the absorber without fins is compared with three different fins with lengths 5, 10 and 15\xa0mm. The final results prove that the higher fin length increases the thermal performance, while the optimum fin length exergetically is 10\xa0mm with 45.95% exergetic efficiency when the inlet temperature is equal to 400\xa0\xb0C. The impact of the pressure losses along the collector is taken into account in the exergetic efficiency, which is the best index for evaluating solar collectors operating with gases. The analysis is performed with Solidworks Flow Simulation, a powerful tool which allows the simultaneous thermal and optical analysis.

Concepts
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Internal Fins
Optimum Mass Flow Rate
Exergetic Efficiency
Mass Flow Rate
Solidworks Flow Simulation
High Temperature Levels
Fin Length
Carbon Dioxide
Collector Performance
Inlet Temperature

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