采用非共沸制冷剂的双喷气增焓两级压缩热泵循环研究

Study on double enhanced vapor injection two-stage compression heat pump cycle using zeotropic refrigerants

提出一种采用非共沸制冷剂的双喷气增焓两级压缩热泵循环(DVIC),该循环在普通喷气增焓循环(VIC)的基础上采用分液冷凝技术,并增加一组闪蒸器,减少系统不可逆损失,改善热力性能。采用R290/R1336mzz(Z)非共沸制冷剂,对DVIC进行研究,并与VIC进行比较。结果表明:在设定工况下,DVIC比VIC拥有更优的循环性能,系统COP和(火用)效率分别提高5.82%和8.41%,压缩机功耗降低6.39%;在较低蒸发温度或较高冷凝温度的运行工况下,DVIC性能的改善效果更加明显。

An double enhanced vapor injection two-stage compression heat pump cycle(DVIC)using zeotropic refrigerants is presented.Based on the ordinary enhanced vapor injection cycle(VIC),DVIC adopts liquid-separation condensation technology and adds an extra flash evaporator to reduce the irreversible loss and improve the thermal perfor-mance.Using R290/R1336mzz(Z)zeotropic refrigerants,DVIC is theoretically analyzed and compared with VIC.The results show that under the specific working conditions,DVIC has better cycle performance than VIC in terms of increasing the system COP and exergy efficiency by 5.82%and 8.41%respectively,and reducing the compressor power consumption by 6.39%.Moreover,the performance improvements of DVIC are more obvious under the operating conditions of a lower evaporation temperature or a higher condensing temperature.