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中文摘要：
对土壤源跨临界CO2热泵供暖系统进行了实验研究。研究了热泵系统连续及间歇运行时温度的变化情况，以及膨胀阀开度对系统运行性能的影响。研究表明间歇运行有利于土壤温度的恢复，从而提高蒸发温度；压缩机功率、制热量、气体冷却器出水温度随着排气压力的升高而增大，但COPH的变化是非单调的，在一定的压力范围内出现最大值。
英文摘要：
A ground-source transcritical CO2 heat pump system for space heating were experimentally investigated. The ground-source temperature variations of continuous or intermittent operation and the influence of the expansion valve opening degree on system COPH （coeificient of performance for heating） were investigated. The result indicated that intermittent operation improved the COPH of system since the evaporation temperature increasing. Compressor power, heating capacity and the outlet temperature at the gas coder exit increased with discharge compressor pressure increasiag. The COPH variation with discharge compressor pressure was not monotonous. There is an optimal pressure which maximizes the COPH.
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