带闪蒸器补气的R134a准二级压缩制冷/热泵系统实验研究

Experimental Research on Quasi Two-stage Compression Heat Pump with Flash Tank Vapor-injection Using R134a

为增加空气源热泵运行的稳定性及提高其性能系数,本文提出了以R134a为工质的涡旋压缩机闪蒸器补气制冷/热泵系统。搭建了实验台对压缩机排气温度、功耗、制冷量、制热量及制冷、制热性能系数进行研究。结果表明:当冷凝温度为45℃,蒸发温度为-20~0℃时,与采用相同工质的单级系统相比,补气系统的排气温度降低了6.2℃,功耗增加1.4%~2.8%,制冷量和制冷COPc分别提高19.8%和17.6%,制热量和制热COPh分别提高15.3%和13.2%。

In order to improve the stability and coefficient of performance of the air source heat pump, a scroll compressor refrigeration/ heat pump system with flash tank was proposed using R134a, and the experiment platform was built. The compressor＇s discharge tempera- ture, power input, cooling capacity, heating capacity, coefficient of performances of the refrigeration/heat pump system were studied. Re- suits showed that, under the condition of condensing temperature 45 ℃ and evaporating temperature from - 20 ℃ to 0 ℃, the discharge temperature of the vapor injection system was 6.2 ℃ lower than that of the single stage compression system, power input increased only 1. 4% to 2.8%, the cooling capacity and cooling COPc are 19.8% and 17.6% higher than that of the single stage system, the heating ca- pacity and heating COPh are 15.3% and 13.2% higher, respectively.