Methodology for comparing the thermodynamic cycle efficiency in refrigerating and heat pump systems

Abstract
Presently there are a number of various approaches to the analysis of working substance efficiency in refrigerating and heat pump units. Their choice is often complicated by numerous requirements, such as fire and explosion safety, low ODP, compliance of production and operation processes with environmental and medical criteria, thermal and corrosion resistance, and price for the substance itself. However, thermodynamic efficiency will always stand out among these specifications.  The technique proposed makes it possible to quickly assess the efficiency of a large number of pure substances and mixtures for refrigerating and heat pump units. It is based on the equality of temperature drops between the heat carrier and working substance in the evaporator and condenser with rigorously fixed parameters of heat carriers in heat exchangers. This technique has been used to calculate and compare thermodynamic efficiency values for the cycles involving a wide diversity of pure working substances and mixtures it refrigerating units.