两级压缩高温热泵系统工质的理论研究  

THEORETICAL INVESTIGATION ON WORKING FLUIDS OF TWO-STAGE VAPOR-COMPRESSION HIGH-TEMPERATURE HEAT PUMP

作　　者：张圣君[1] 王怀信[1] 郭涛[1] 

机构地区：[1]天津大学热能与制冷工程系,天津300072

出　　处：《工程热物理学报》2010年第10期1635-1638,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50976079);国家高技术研究发展计划(863计划)(No.2009AA05Z431)

摘　　要：本文在100～130℃的冷凝温度范围内,以HFCs、HCFCs和HFEs类纯质为研究对象,开展了五种两级压缩循环方式下,高温热泵工质的理论筛选研究,并以R245fa为工质,比较了在不同循环方式下工质的理论循环性能。研究结果表明,R245fa、E143和R123在两级压缩完全冷却系统中的综合性能优良,E245cb、R245ca、E245fa和R245fa在两级压缩不完全冷却系统中的综合理论循环性能良好;两级压缩循环方式下工质的COP_h较单级压缩系统有较大提高,排气温度明显降低,压缩机的工作条件得到改善,因此有利于提高热泵的工作温度水平和系统的性能。A screening of working fluids for five circulation modes of two-stage vapor-compression high-temperature heat pumps was conducted theoretically at the condensing temperature of 100-130℃ with temperature lifts of 45℃. Theoretical cycle performance of R245fa in the five modes was compared. The result shows that R245fa, E143 and R123 exhibit better performance in the two-stage compression heat pump with superheated gas at the inlet of second stage of compressor. And E245cb, R245ca, E245fa and R245fa present good cycle performance comprehensively in the two-stage compression heat pump without superheated gas at the inlet of second stage of compressor. The COPh is greatly increased and the discharge temperature is reduced obviously compared with single vapor-compression cycle. The condensing temperature and the performance of the heat pump can be enhanced by the application of two-stage vapor-compression cycle.

关 键 词：工质 高温热泵 两级压缩 理论循环分析 

分 类 号：TB612[一般工业技术—制冷工程]