Optimization analysis of throttling characteristics of R290 air conditioner
PAG oil with low mutual solubility is selected as the lubricating oil of some R290 air conditioner compressors.In the case of viscosity conditions,the use of low misci-ble lubricating oil is conducive to reducing the amount of system filling.Because the R290 air conditioner has the characteristics of low charge and large displacement compressor,under low temperature conditions,the refrigerant/lubricating oil mixture with poor mutual solubility is easy to flow in layers,and abnormal throttling may occur in the de-frosting restart process of air conditioning heating mode.This paper analyzes and optimizes the abnormal throttling phenomenon of R290 air conditioner under low tempe-rature conditions from the aspects of compressor oil return,throttling characteristics and expansion valve opening control.
hermetic rotary compressor of R290throttle characteristicsoil block
万方数据
维普
