Exergy efficiency analysis of stirling heat engine driven by solar dish collector based on FTT

Exergy efficiency analysis of endoreversible stirling heat engine driven by parabolic dish collector was studied by finite time thermodynamics. The results indicate that exergy efficiency of dish system increases at beginning and decreases afterward with increasing of the collector temperature and concentrating ratio, decreases with increasing of regenerative time coefficient. It is also found that optimal range of collector temperature and corresponding concentrating ratio are 1000 K-1600 K and 600-1000, respectively. Maximum exergy efficiency of dish system can reach 0.54 when operating temperature and concentrating ratio are 1200 K and 850, respectively. The results can provide guidance for designing collector and operating Stirling heat engine.