为了研究复叠式高温热泵系统各部件火用损分布特性及其产生的原因以指明系统优化方向，通过搭建实验台，实现了90 ℃的大温差升温(30~120 ℃)。基于实验数据，分别采用常规火用分析和先进〖HT5”，7〗火用分析（advanced exergy analysis）方法对复叠式热泵系统进行分析。结果显示：高温压缩机和低温压缩机的火用损失最大，系统的内源火用损失占总火用损失的93.73%，可避免火用损失占总火用损失的70.79%，表明火用损失主要来自于部件本身，且部件的改进潜力很大；高温压缩机、低温压缩机和高温冷凝器的内源可避免火用损失最大，在系统优化时应当优先考虑这些部件，可减少系统51.04%的火用损失。

In order to study the characteristics and causes of the exergy loss distribution of the components of cascade hightemperature heat pump system to clarify the direction of system optimization,the experimental bench of cascade hightemperature heat pump system was built to achieve the large temperature rise of 90 ℃(30 ℃ to 120 ℃).The conventional and advanced exergy analysis methods were respectively adopted to study the cascade heat pump system based on the experimental data.The results show that the exergy losses of hightemperature and lowtemperature compressors are the highest.The endogenous and the avoidable exergy losses of the system account for 93.73% and 70.79% of the total exergy loss respectively.It is indicated that the exergy loss is mainly resulted from component itself and the potential for component improvement is considerable.The endogenous and avoidable exergy losses of the hightemperature and lowtemperature compressors and hightemperature condenser are the largest,so these components should be considered preferentially during the system optimization,which can reduce 51.04% of the system exergy loss.

TK115;TK123

天津市自然科学基金（18JCYBJC90500）；天津市科学技术局技术创新引导专项(基金) （20YDTPJC01150）