Name : [in Japanese]
Date : July 07, 2022 - July 08, 2022
For the practical application of the low Global Warming Potential (GWP) refrigerant, which has been actively studied recently, it is necessary to determine the optimal amount of charge required for the system and evaluate the performance in the design stage of the HVAC system. However, it is reported that the low GWP refrigerant has the characteristics of zeotropic refrigerant and has different characteristics from the existing refrigerants. Among the various characteristics of refrigerants, the void fraction is one of the essential characteristics concerning the amount of charge of the refrigerant. Therefore, to predict accurately the charge amount of the low-GWP refrigerants including zeotropic refrigerants in the system, it would be required to examine whether the existing void fraction correlation equations can be applied to lowGWP refrigerants. In this study, the void fraction was measured for R454C, which is a low-GWP refrigerant, and among the conventional correlation, the Smith, Chisholm and Steiner correlation were found to predict the void fraction of R454C within acceptable error limits, in that order.
