非共沸混合工质R134a/R245fa温度滑移研究

Study on Temperature Slip of Non-azeotropic Mixture R134a/R245fa under High Temperature Condition

基于筛选出的混合工质R134a/R245fa,利用REFPROP软件计算其同一工况下换热器两相区内相变过程焓变斜率与两相区长度上混合工质的温度滑移。对比相变过程中传热温差最大、最小点的产生条件,精确换热器中混合工质传热温差的变化,为保持热泵系统的良好运行提供一定的理论依据。

Based on the non-azeotropic mixture R134 a/R245 fa which is picked out, using the REFPROP software to calculate the enthalpy slope of the phase transition process in the two-phase zone of the heat exchanger under the same operating conditions and the temperature slip of the mixed refrigerant. Comparing with the condition where heat transfer temperature difference occurred the largest and smallest point in the phase change process, accurating the variation of heat transfer temperature difference of the mixed refrigerant in heat exchanger, providing a theoretical basis for maintaining the good operation of the heat pump system.