Estimation of thermodynamic properties of environmentally friendly new-generation R515B and R450A as an alternative to R134a

Abstract

In the analysis of vapor compression refrigeration systems, simple and effective mathematical formulas are required to determine the thermodynamic properties of refrigerants. This study aims to determine the thermodynamic properties such as enthalpy, entropy, and specific volume of environmentally friendly new-generation refrigerants (R515B and R450A) with low global warming potential using gene expression programming (GEP). The thermodynamic properties calculated using the formulations obtained from the GEP model and the actual thermodynamic properties obtained from the REFROP software were compared. Performance evaluation criteria such as R², root mean square error, and mean absolute percent error are in the range of 0.86 to 0.999, 0.0000285-6.489, and 0.0009-0.35, respectively, and these values are acceptable. This study offers simple and efficient formulations to calculate the thermodynamic properties of new-generation refrigerants without the need for any software. So, the simulation of cooling and heat pump systems will be greatly facilitated.

Keywords: Enthalpy; Entropy; GEP; HFC/HFO mixture; New-generation refrigerants; R450A; R515B; Specific volume.