Study on the critical properties calculation models of CO2-based binary mixture working fluid
Carbon dioxide(CO2)mixed working fluid is a power cycle working fluid with application potential.Critical parameters are the key basic thermophysical properties of CO2 mixed working fluid,and its accurate calculation and prediction are of great significance.Four types of calculation models were used to calculate the critical temperature and critical pressure of three types of binary mixture working fluids,namely CO2+HFC,CO2+ HFO and CO2+HC,and compared with the published experimental measured data and REFPROP database.The applicability of calculation models to each type of CO2-based binary mixture is analyzed and discussed.The results show that Li method has a simple form,and the calculation formula of mixture's critical temperature is only related to the critical temperature and critical volume of the pure substances,which can be used to quickly calculate critical temperature of CO2+HFC and CO2+HFO.For the CO2+HC,the RK method showed the lowest deviations when predicting the critical pressure.Due to the completeness on experimental data points and sets of critical properties,the correlation can be directly obtained through RK method for application.
万方数据
维普
