Experimental study of alternative refrigerants to replace R134a in a domestic refrigerator
Author(s): AE Kharat, Dr. DM Mate, SD Kathwate
Abstract: Recently, The Ozone Depleting Potential (ODP) and Global Warming potential(GWP) have become the most important criteria in the development of new refrigerants apart from the refrigerant CFCs and HCFCs, both of which have high ODP and GWP due to their contribution to ozone layer depletion and global warming. Results from researchers show that the ozone layer is being depleted due to the presence of chlorine in the stratosphere. The general consensus for the cause of this that CFCs and HCFCs are large class of chlorine containing chemicals, which migrate to react with ozone. This leads to the strict prohibition Of CFCs. The R134a was the first chlorine-free refrigerant discovered (Bolaji, 2010). R134a is used nowadays as the working fluid in domestic refrigerators. But it was found that the R134a increasing significantly to the world’s greenhouse warming problem. This caused scientists to investigate more environmentally friendly refrigerants than HFC refrigerants for the protection of the environment such as hydrocarbon mixtures as working fluid in refrigeration and air-conditioning systems. The possibility of using hydrocarbon mixtures as working fluid to replace R134a in domestic refrigerators has been evaluated through the simulation analysis. This simulation concludes that the hydrocarbon refrigerants offer desirable environmental requirements i.e., zero ODP and approximately zero GWP. A hydrocarbon blend of difluoromethane (R32), propane (R290) and iso-butane (R600a) is recommended to avoid the stratospheric ozone depletion. The presence of R600a in the mixture is miscible with both mineral oil and synthetic lubricants.