Numerical analysis of scroll compressor performance with pre-discharge valve for low-temperature heat pumps

Key Words:ELECTRIC VEHICLES; REED VALVE

Abstract:Scroll compressors are a crucial component of automotive air conditioning systems. When operating at offdesigned working conditions, over-compre can occur in the scroll compressor. A pre-discharge valve (PDV) is proposed to enhance the performance of the scroll compressor under off-design working conditions. The performance of the scroll compressor with a PDV for a low-temperature heat pump system is simulated. The results show that the scroll compressor with the PDV structure has lower pressure in the compre chambers and improved over-compre compared to conventional scroll compressors. The use of the PDV also leads to a reduction in the temperature of the refrigerant gas in the compre chambers and a decrease in the leakage between the compre chambers. As the evaporating temperature increases from -25 degrees C to -5 degrees C, the mass flow rate and volumetric efficiency increase, and the discharge temperature decreases. At an evaporating temperature of -5 degrees C, the discharge temperature at the center discharge port of the scroll compressor with the PDV is reduced by 2.4 degrees C compared to the conventional scroll compressor. The input power of the scroll compressor is reduced by 165.4 W-897.7 W. The volumetric efficiency and the isentropic efficiency are improved by 0.13 % and 6.63 % respectively.

Volume:254

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Translation or Not:no