Abstract: With increasing recognition of environmental protection, a great deal of attention has been devoted to the negative environmental effect of CFCs and HCFCs refrigerant. Based on scientific findings, regulatory requirements and market pressure, the governing selection criteria for the new alternative refrigerants are changing. New long term alternative refrigerant should have not only zero ODP but it should have low GWP value As per the research and scientific study of environmental pollution extensively, there is an noteworthy need to phase out R22 earlier than that prescribed by Montreal protocol. Any alternative to R22 has to possess all desirable properties of refrigerants like thermodynamic efficiency, non-flammable and non-toxic, thermal and chemical stability, compatibility and low cost. There are other concerns such as Ozone Depletion Potential (ODP) & Global Warming Potential (GWP) of a refrigerant. Vapour compression refrigeration system is used for many applications such as cooling the food items in the refrigerator like vegetables ( potato, tomato, etc), fruits (banana, palms, apples, etc) & Medicines, Pharmaticules, beverages, pickles and chutneys, processed mushrooms etc are required to be stored in the cold storages to meet the market demand basically those refrigeration system used refrigerant like R134a, R22, R410, R700C in various countries of the world however it is always tied out we use environment-friendly refrigerants the refrigerantsR134a, R22, R410, R700 facilities in As per the scientific study of environmental pollution extensively, there is an significant need to phase out R22 earlier than that prescribed by Montreal protocol. Any alternative to R22 has to possess all desirable properties of refrigerants like thermodynamic efficiency, non-flammable and non-toxic, thermal and chemical stability, compatibility and low cost. There are other concerns such as Ozone Depletion Potential (ODP) & Global Warming Potential (GWP) of a refrigerant. Worldwide many research activities are carried out to mitigate the till effects of Global Warming, Ozone layer depletion and climate changes. For the past 20 years efforts are made to phase out the production and consumption of Hydro Chloro-Fluorocarbon (HCFCs) and Chloro-Fluorocarbon (CFCs), as these chemicals are responsible for the depletion of the stratospheric ozone layer and used in refrigeration and air-conditioning industry. The Current literature review has indicated that to satisfy the objectives of International protocols, many research works are in finding out a suitable alternative refrigerant with low Global Warming Potential (GWP) compared with R22, minimizing the mass of refrigerant charge used in the system, enhance and ensure energy efficient system operation by adding intelligence to components and enhance the energy efficiency of the system. In that glance, retrofitting of existing R22 vapour compression system with Eco friendly refrigerant R290 is attempted in the present research work.

Keywords: COP- Coefficient of Performance CFC-Chlorofluorocarbon ODP-Ozone Depletion Potential GWP-Global Warming Potentia, HCFC-Hidrochlorofluorocarbon R-Refrigerant.