一种新型R32两级压缩热泵空调器的理论研究

Research on a new two-stage compression for heat pump air-conditioning with R32

针对R32单级压缩空调器排气温度偏高的问题,提出采用双缸滚动转子式压缩机实现两级压缩制冷循环的方案来降低系统的压缩比和排气温度并提高性能系数(CCOP)。建立相应的理论模型,计算了制冷工况和热泵工况下的性能参数。结果表明:采用两级压缩循环方式在制冷工况和热泵工况下使压缩机的排气温度分别降低了30.1℃和28.5℃,CCOP分别提高了3.02%和8.15%;同时分析了中间温度对压缩比、排气温度和系统的CCOP的影响,给出了最佳中间温度的范围。

In our study, because the high exhaust temperature was occured in single - stage compression for air - condition- ing with R32, a two - stage compression refrigeration cycle using a twin - cylinder rotary compressor was adopted in air - condi- tioning to reduce the pressure ratio and exhaust temperature, and enchance coefficient of performance （CCOP）. A theoretical model about two - stage compression cycle with R32 was established, and performance parameters were calculated in cooling mood and heating mood . Results show that exhaust temperature of the compressor was reduced respectively by 30.1℃ in cooling mood and 28.5℃ in heating mood , CCOP was improved respectively by 3.02% and 8.15% for two - stage compression cycle. The impact of intermediate temperature on the compression ratio, exhaust temperature and CCOP was analyzed, and the best interme- diate temperature was given .