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对土壤源跨临界CO_2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,从析提高蒸发温度;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。
The soil source transcritical CO 2 heat pump heating system was experimentally studied. The change of temperature in continuous and intermittent operation of heat pump system and the influence of expansion valve opening on system performance are studied. The results show that the intermittent operation is beneficial to the recovery of soil temperature and the evaporation temperature is increased from the analysis. The compressor power, heating capacity and gas cooler outlet temperature increase with the increase of exhaust pressure. However, the change of COPH is non-monotonic. The maximum pressure appears within a certain pressure range.