...关键词：空气源热泵,复叠式热泵,高温热水系统,环境温度,运行特性, [gap=879]Keywords：air-source heat pump,cascade heat pump,high temperature hot water system,environment temperature,operation performance..
According to operating heatpump process and the water supply process, the experiment is aim to find out how the cascadeheat pump work which combined withthePCM.