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Hydrocarbons are natural fluids which create less environmental effect in nature and cause less emission also. This paper emphasizes the heat-transfer performances and global warming potential of the existing refrigerant, R-22, and compares it with some hydrocarbon mixtures for the domestic air conditioner. Propane with different proportions is taken for comparison. R-134a and R-407C are also used as refrigerants in the refrigerators and in commercial or large scale air conditioners, respectively. Two mixtures of R-290 with R-22 having proportions 25:75 and 50:50 by mass are used for comparison. Global warming potential of R-22 is flammable refrigerant. Mixing of R-290 with R-22 reduces the globalwarming potential, and also reduces the flammability issue. This mixture finds better heat transfer enhancement compared to that of R-22. Thus, the heat transfer coefficient for the mixture increases up to 20–30 % compared to that of R-22. Indirectly it causes to reduce the requirement of refrigerant charges, and hence, the emission in the environment will also be reduced.
Ahamed, J. U., R. Saidur, & H. H. Masjuki (2014) Investigation of Environmental and Heat Transfer Analysis of Air Conditioner Using Hydrocarbon Mixture Compared to R-22, Arab. J. Sci. Eng. 39:4141-4150.