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设计搭建了一套跨临界CO_2水一水热泵热水器性能测试台,对该系统的性能进行了初步研究。测试了气冷器水流量变化对热泵热水器的气冷器出水温度(即产热水温度)、气冷器CO_2出口温度、压缩机吸气温度、排气压力、系统COP的影响。试验结果表明:1)跨临界CO_2热泵热水器可获得80℃以上热水;2)增加气冷器水流量可有效提高系统的COP。对气冷器的换热性能进行了分析,结合最优排气压力对系统COP较低的原因进行了分析,为下一步系统改进提供了依据。
Design and build a set of transcritical CO_2 water-water heat pump water heater performance test stand, the performance of the system for a preliminary study. The influence of the change of water flow rate on the temperature of the air cooler of the heat pump water heater (ie, the temperature of the hot water produced), the CO 2 outlet temperature of the air cooler, the suction temperature of the compressor, the exhaust pressure and the COP of the system were tested. The experimental results show that: 1) Transcritical CO_2 heat pump water heater can obtain more than 80 ℃ hot water; 2) Increasing the air cooler water flow can effectively improve the COP of the system. The heat exchange performance of the air cooler is analyzed, and the reason of the lower COP of the system is analyzed by combining the optimal exhaust pressure, which provides the basis for the further improvement of the system.