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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。
Based on the principle of refrigerant selection, the working parameters of high temperature cascade air source heat pump suitable for low ambient temperature are compared and several working pairs are selected for the high temperature air source heat pump. More suitable for high-temperature working fluid: R134a, R413A, R1234ze; more suitable for low-temperature working fluid: R404A, R407C, R417A, R507, R1234yf. Through the thermal analysis of the properties of cascade air-source heat pump with different working medium, it can be seen that when the cascade heat pump with R1234ze / R404A and R1234ze / R1234yf is used as the working medium, Compared with other working fluid on the thermal properties have obvious advantages.