Study on double enhanced vapor injection two-stage compression heat pump cycle using zeotropic refrigerants
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 ob-vious under the operating conditions of a lower evaporation temperature or a higher con-densing temperature.
heat pumpzeotropic refrigerantsenhanced vapor injectionliquid-separation condensationcoefficient of performanceexergy loss
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