EFFECT OF USING R-22, R404 AND R-407C ON PERFORMANCE OF AN AIR-CONDITIONING SYSTEM

الملخص

Due to environmental depletion, replacing chlorofluorocarbons in the refrigeration industry was an important problem. In the experimental study, a (1.0 TR) vapor compression system was used with the original working fluid of R-22 and compared to alternatives refrigerant R-407C and R-22. The effects of the main parameters of performance analysis such as refrigerant type, compressor pressure ratio, outlet air evaporative temperature, coefficient of performance were investigated for various ambient temperatures above 50 ºC. The results showed that the compressor ratio of the system using R404 and R-407C is more than the compressor ratio of the system using R22 by 2% and 4% respectively. Also, the outlet air evaporative temperature of the system using the alternative refrigerant R-22 is more than the outlet air evaporative temperature with the system using R-407C and R-404 by 8% and 5% respectively. The coefficient of performance of R-407C was measured with the same reciprocating compressor that was supplied with the R-22 system. It could be concluded that there is a decrease of 8% in system COP as friendly environment R407C compared with the system using R-22 and a decrease of 12% in system COP when using R-404. However; the result showed that R407C has thermodynamic performance similar to R-22. Engineering Equation Solver (EES) software is used to draw (p-h) diagrams for the cycle.