CAJ | 학술논문

介绍以毛细管为节流装置跨临界CO2热泵热水试验系统。实验研究了不同气冷器进水温度下系统的COP及其变化、气冷器沿管长水温温升梯度变化。分析了不同环境温度下制冷剂充注量对系统高压侧压力的影响。可以得出：以毛细管做节流装置也可以得到较高的COP；气冷器水温在高温CO2进口段温升幅度最大；系统对环境温度的变化很敏感，环境温度较低时要想得到合适的高压侧压力，制冷剂的充注量要比环境温度高时多。
개소이모세관위절류장치과림계CO2열빙열수시험계통。실험연구료불동기랭기진수온도하계통적COP급기변화、기랭기연관장수온온승제도변화。분석료불동배경온도하제랭제충주량대계통고압측압력적영향。가이득출：이모세관주절류장치야가이득도교고적COP；기랭기수온재고온CO2진구단온승폭도최대；계통대배경온도적변화흔민감，배경온도교저시요상득도합괄적고압측압력，제랭제적충주량요비배경온도고시다。
A trans-critical CO2 heat pump water heater with capillary tube as throttling device was presented. The changes of COP in different gas cooler inlet temperate were experimentally studied. The water temperature gradient along the gas cooler length was also investigated. The effects of refrigerant charge amount to high-pressure side＇s pressure in different environment temperature were introduced. We can conclude： the higher system COP can be obtained with capillary tube as throttling device; The gas cooler water temperature have maximum temperature rise in the inlet area. The system is sensitive to ambient temperature. In order to get the right high side pressure when the ambient temperature is lower, there needs more refrigerant than higher ambient temperature.