制冷剂中间排出式双温热泵性能研究

Investigation on the performance of a dual temperature heat pump with intermediate discharge of refrigerant

为满足双温供热的需要,提出了新型滚动转子压缩机制冷剂中间排出的双温冷凝热泵系统,并建立了系统模型,以R1234yf为制冷剂对系统进行了计算和分析.结果表明:随着相对中间排气量的增大,压缩机功耗下降,制热性能相应上升;随着蒸发温度的升高,压缩机的吸气流量增加,压缩机功耗和制热性能均上升;随着中温冷凝温度的升高,压缩机功耗上升,制热性能下降;随着高温冷凝温度的升高,压缩机功耗和制热性能同样分别呈现上升和下降的趋势.当蒸发温度为5℃,中温冷凝温度为40℃,高温冷凝温度为65℃,相对中间排气量为28%时,双温冷凝热泵系统的制热性能较传统单冷凝热泵系统提升接近11%.

A novel dual-temperature condensation heat pump with the intermediate discharge of refrigerant(DTHP-IDR)is proposed to supply heat at two temperature levels.The system model was set up.in which R1234yf was used as the refrigerant.The results show that as the intermediate exhaust ratio increases,the compressor consumption decreases,and the heating performance coefficient increases.As the evaporation temperature increases,the mass flow rate of the compressor,the compressor consumption,and the heating performance coefficient all increase.As the middle-temperature condensation temperature increases,the compressor consumption increase,while the heating performance coefficient decrease.As the high-temperature condensation temperature increases,the compressor consumption and the heating performance coefficient of DTHP-IDR increase and decrease respectively too.It is found that when the evaporation temperature is 5℃,the middle and high-temperature condensation temperatures are 40℃and 65℃,respectively.When the exhaust ratio is 28%,the heating performance coefficient of DTHP-IDR is improved by around 11%compared with the traditional single condensing heat pump system.