Abstract
In refrigeration and air-conditioning fields, selection of alternative refrigerant of R-22 conventionally used is an important problem. As a new generation refrigerant, hydrofluorocarbons (HFCs), hydrocarbons (HCs), hydrofluoroethers (HFEs), and other substances or the mixtures are compared in this report. As an interface for using refrigerant in industry, thermodynamic equation of state based on thermodynamic-property measurements is needed. Various thermodynamic equations of state are reported for the candidates of new generation refrigerant. In this report, thermodynamic characteristics including COP of the candidates are calculated by using selected equations of state and compared each other from a viewpoint of possibility of a new generation refrigerant.
