Modeling and experimental verification of isentropic efficiency for variable frequency rolling piston compressor under variable suction condition
The experimental platform for variable frequency rolling piston compressor under variable suction condition was established to analyze the influence mechanism and variation rule of compressor frequency,compression ratio,suction superheat,suction dryness,evaporation temperature and condensation temperature on isentropic efficiency.An isentropic efficiency model of variable frequency rolling piston compressor under variable suction condition was established.The results show that the isentropic efficiency of the compressor decreases continuously from the compressor suction superheat(10 K)to the wet compression stage(suction dryness about 0.9)with a decreased range from 8％to 10％,and the decrease slope in the wet compression stage is greater than that in the suction superheat stage.Under the same suction state of the compressor,the isentropic efficiency of compressor decreases with increasing frequency and compression ratio,respectively.The reduction amplitude of both is non proportional.Under the same suction state of compressor,the influence of condensation temperature change on the isentropic efficiency is much greater than that of the evaporation temperature.After experimental verification,the maximum relative error between the experimental and calculated values of the isentropic efficiency wet compression model for a rolling piston compressor is 1.85％,and the minimum relative error is 0.016 2％.Therefore,the model is proved to have a certain degree of reliability.
variable frequency rolling rotorisentropic efficiencytwo-phasemodel
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