Numerical analysis of scroll compressor with combined profiles and intermediate discharge valve

Key Words:HEAT-PUMP SYSTEM; PERFORMANCE EVALUATION; ELECTRICAL VEHICLE; FLOW; PORT

Abstract:Scroll compressors serve as core components of electric vehicle heat pump systems. Variations in operating conditions occur when electric vehicles are used under different environmental conditions. During the off-design operation of heat pumps, scroll compressors may experience over-compression or under-compression phenomena, which lead to a decrease in the system efficiency. The technology of the intermediate discharge valve can enhance compressor performance under off-design operating conditions. However, scroll compressors with traditional circular-involute profiles employing intermediate discharge valve technology exhibit limitations such as small connecting channel areas and narrow operational ranges. This study proposes a novel scroll compressor with a combined profile and intermediate discharge valve technology. The combined profile is composed of circular involute, circular arc, and circular involute. The impact of the intermediate discharge valve on compressor performance was analyzed using CFD methods. The results show that the intermediate discharge valve effectively reduces the degree of over-compression and improves the asymmetric phenomena in pressure and temperature fields within symmetrical compressor chambers. The scroll compressor with the combined profile and intermediate discharge valve exhibits superior performance compared to the compressor with the circular involute profile. As the evaporation temperature rises, the improvement of the compressor performance by the intermediate discharge valve becomes more significant. When the evaporation temperature is 10 degrees C, the compressor having the combined profile and intermediate discharge valve showed a 0.37 MPa reduction in the maximum pressure, a 0.24 kW decrease in power consumption, and an improvement in isentropic efficiency from 66.3 % to 85.6 % compared to the compressor without the intermediate discharge valve.

Volume:275

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Translation or Not:no