太阳能复叠喷射冷热双蓄系统性能优化潜力研究

STUDY ON OPTIMIZATION POTENTIAL OF SOLAR CASCADE EJECTOR SYSTEM WITH COLD AND HEAT STORAGE

针对太阳能R290/CO_(2)复叠喷射冷热双蓄系统,通过先进[火用]分析方法研究系统部件间的相互作用以及优化潜力,探讨喷射器效率以及中间换热器CO_(2)侧压力对系统性能的影响规律。先进[火用]分析结果发现R290喷射器的可避免内源损最大,其具有最高的改进潜力,系统[火用]损中88.90%为内源[火用]损、41.68%为可避免[火用]损。通过提高喷射器效率可有效改善整个系统的?效率。同时系统中存在最佳的中间换热器CO_(2)侧压力,可使系统[火用]效率达到最高,从而使得R290喷射器的可避免内源[火用]损最小。

This paper presents an investigation on the solar cascade ejector system with cold and heat storage using the refrigerant R290/CO_(2).The advanced exergy analysis method is utilized to analyze the interactions and optimization potential among the system components,and the effects of ejector component efficiency and CO_(2)side pressure of intermediate heat exchanger on system exergy performance are discussed.The R290 ejector has the largest avoidable endogenous exergy destruction and the highest potential for improvement,according to advanced exergy study results.Endogenous destruction accounts for 89.82%of the system exergy destruction,whereas the avoidable destruction accounts for 42.14%.The exergy efficiency of system can be effectively improved by increasing the ejector efficiency.There exists an optimal intermediate heat exchanger pressure to maximize exergy efficiency of system and minimize the avoidable endogenous exergy destruction of the R290 ejector.