Experimental Investigation to Retrofit HCFC-22 Window Air Conditioner with R-407C

In this paper, refrigerant R407c has been experimentally investigated to retrofit the refrigerant R22 in the existing systems. Window type air conditioner with capacity of 7.0 kW using R22 as working fluid has been selected to conduct the experimental work. The two refrigerants R22 and R407C have same operation conditions are selected in order to compare these thermal performances. The results showed that the refrigeration effect of R22 is higher than those for R407C. Consequently, the coefficient of performance COP of R407C is lower than R22. Also, the discharge temperature of the R407C is lower than those of R22. The pressure drop in the evaporator and condenser of the R407C less than those for R22. Moreover, the condensation temperature decreases along the length of the condenser coil for two refrigerants. The condensation temperatures for R22 is higher than the condensation temperatures of R407C at same ambient temperature. Finally, R407C can be considered as a suitable replacement for R22 with a slight variation in the performance with no need to change any part of the refrigeration system.