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THERMODYNAMIC PROPERTIES OF SELECTED HFC REFRIGERANTS
Smith*, N D. AND M. W. Tufts. THERMODYNAMIC PROPERTIES OF SELECTED HFC REFRIGERANTS. INTERNATIONAL JOURNAL OF HEATING, VENTILATING, AIR CONDITIONING, & REFRIGERATING RESEARCH 2(3):257-261, (1996).
Hydrofluorocarbon (HFC) refrigerants are possible alternatives to replace ozone-depleting chlorofluorocarbon and hydrochlorofluorocarbon (HCFC) refrigerants. The flammability of a proposed new refrigerant is a major consideration in assessing its utility for a particular application. Enthalpy (or heat) of combustion is one of the important parameters in assessing the flammability of a proposed new refrigerant. The American Society of Heating, Refrigerating and Air-Conditioning Engineers considers the enthalpy of combustion together with the lower flammability limit in classifying refrigerants as nonflammable, moderately flammable, or highly flammable. Also, combustion enthalpy is employed in the calculation of adiabatic flame temperatures and theoretically correlates with flammability limits. A related thermodynamic property, the Gibbs free energy of combustion, is a measure of the chemical force which drives the combustion reaction to equilibrium at constant temperature and pressure.