Experimental Investigation On Portable Air-conditioner Application With Environmental Friendly Refrigerant

Freon(CFCs,HCFCs) is widely used in the refrigerating equipments and air-conditioner. Because of their depleting the ozonosphere and making the earth become warmer, the developed countries had been prohibited from producing and used CFCs since 1996, and the banning schedule for HCFC-22 would be ahead from 2030 to 2020 according to the Montreal Revision. On the basis of alternative refrigerants, especial alternative for HCFCs, the paper demonstrate the possibility that propane(R290) substitute R22 in the portable air-conditioner, including the physical and chemical properties, theoretical refrigerating cycle, economic, safety concerning the R290, and etc. With the basic physical properties of approaching almost to R22's, stable chemical property, low price, compatibility with material used commonly in the refrigerating equipments, no damaging the environment, R290 has a bright future as alternative for R22.On the basis of literature survy on the in-tube condensation of refrigerant and the in-tube evaporation of refrigerant, the condensation heat transfer and the evaporation heat transfer of R290 are studied in horizontal microfin tube and smooth tube.This thesis presents some correlations in smooth and in-tube condensation of refrigerant R290。Compared to the experiment data,choose the correlations fit to the smooth and in-tube condensation of refrigerants. The fundamental theory and method of air-conditioner by means of enthalpy are introduced, analyzing the results of the experiment:relations of the refrigerating capacity,input power,energy efficiency ratio and the capillary tube length. By making use of the results, a principle about how to confirm the capillary tube length for the portable air-conditioner has been put forward.