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Abstract
In the field of refrigeration system, the nano-refrigerants are being widely used in enhancing the characteristics of refrigerants. The ultrafine sized nano-particles ranging from (1-100 nm) are added to commercially available refrigerants. These are added at a varying volumetric concentration levels to develop various refrigerants. This paper highlights the research work undertaken by various researchers achieved by the researchers after performing experiments. These experiments can yield different results on important aspects like thermal conductivity, specific heat etc. and there by analysis had been performed. It has been also found that with the addition of different metal oxides (CuO, Al2O3 , TiO2 and ZnO) were found to be effective in increasing the thermal conductivity and efficiency of the refrigeration system. Further the pumping work was found to be varying significantly at various levels as per experimental studies on refrigeration system.