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Abstract:
In this paper, first law and second law thermodynamic analysis for hydrocarbon refrigerants are performed. Hydrocarbons, R290, R1270 and a mixture of R290/R1270 of 15/85 wt % are used as drop-in refrigerant to R22. The refrigeration system consists of a simple direct expansion refrigeration cycle with an adiabatic compressor having an isentropic efficiency of 85%. The suggested cooling load is 1 kW. The evaporator temperature is 249, 253, 257, 261, 265, 269, 273 and 277 K for a condenser temperature of 313 K, then the condenser temperature is varied between 308, 313, 318, 323, 328 and 333 K for an evaporator temperature of 263 K. Thermodynamic properties of all refrigerants are compared. Hydrocarbons showed a specific cooling capacity that is 68%-77% higher than that of R22 with 39.7%-43.5% lower refrigerant mass flow rate. R22 showed a cycle COP and a second law efficiency that are 2% and 2-4% higher than that of hydrocarbon refrigerants respectively.
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