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中文摘要：
基于制冷工质筛选原则，对适用于低环温的高温复叠式空气源热泵工质物性参数进行比较，并为该高温空气源热泵选定了几种可用的工质对。较适合高温级的工质为：R134a、R413A、R1234ze；较适合低温级的工质为：R404A、R407C、R417A、R507、R1234yf。通过对采用上述工质组成不同工质对时高温复叠式空气源热泵性能进行热力分析，可以看出：当采用R1234ze/R404A与R1234ze/R1234yf为工质对的复叠式热泵在低温环境下较采用其他工质对时热力性能有明显优势。
英文摘要：
Based on screening principle for refrigerant working fluid, property of cascade high temperature air source heat pump which suit for low temperature environmental was compared, and several working fluid pairs was selected to the high temperature air source heat pump. The suitable high-temperate working fluid including R134a、R413A、R1234ze; the suitable low-temperate working fluid including R404A、R407C、R417A、R507、R1234yf. According to thermodynamic analysis on performance of the cascade high temperature air source heat pump as several working fluid pairs consisted by above working fluid was adopted, it can be seen that when R1234ze/R404A and R1234ze/R1234yf are adopted as working fluid pairs the thermodynamic performance of cascade high temperature air source heat pump will be more preponderant.
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