CAJ | 학술논문

设计了一套带喷射器的跨临界CO_2热泵热水器系统实验平台,开发了相应的计算机测控系统.进行了改变冷却水体积流量和进口温度对系统性能影响的实验研究,分析了制热系数、制热量、压比、喷射系数、升压比、喷射器效率等参数的变化趋势.实验结果表明:随着冷却水体积流量减小或进口温度增加,喷射系数增加的同时,升压比也增加,而喷射器效率却降低;在测试工况范围内喷射器效率最高达到34%,升压比最高达到1.165;在蒸发温度为-5℃时,制热系数达到3左右.带喷射器的跨临界CO_2热泵热水器循环的压缩机压比与传统循环相比减少了12%～14%,喷射器的引入有效地提高了跨临界CO_2热泵热水器循环的效率.
설계료일투대분사기적과림계CO_2열빙열수기계통실험평태,개발료상응적계산궤측공계통.진행료개변냉각수체적류량화진구온도대계통성능영향적실험연구,분석료제열계수、제열량、압비、분사계수、승압비、분사기효솔등삼수적변화추세.실험결과표명:수착냉각수체적류량감소혹진구온도증가,분사계수증가적동시,승압비야증가,이분사기효솔각강저;재측시공황범위내분사기효솔최고체도34%,승압비최고체도1.165;재증발온도위-5℃시,제열계수체도3좌우.대분사기적과림계CO_2열빙열수기순배적압축궤압비여전통순배상비감소료12%～14%,분사기적인입유효지제고료과림계CO_2열빙열수기순배적효솔.
An experimental water heater system using a transcritical CO_2 heat pump with an ejec-tor was designed, and a measurement and control system was developed. Experiments were con-ducted to assess the effects of cooling water flow rate and inlet temperature on the system per-formance. The changes of the heating coefficient of performance (C_r), heating capacity, pressure ratio, entrainment ratio, pressure lift were and ejector efficiency were analyzed. The experimen-tal results show that the entrainment ratio and the pressure lift were increased while the ejector efficiency was decreased with the decrease in the cooling water flow rate or the increase in the in-let temperature. Under the experimental working conditions, the ejector efficiency was up to 34%, and the pressure lift was up to 1. 165. The C_r reached about 3.0 when the evaporation tem-perature was -5℃. Compared with that of a conventional system with an expansion valve, the pressure ratio of the compressor in the present water heater system is decreased by 12%-14%. It appears that the ejector can improve the system performance of transcritical CO_2 heat pump water heaters effectively.