Refrigeration plays a significant role in today's modern lifestyle. It has a wide range of applications in both the domestic and commercial sectors. Most of these systems work on the principle of a vapour compression refrigeration system, which operates on a work-based cycle. Natural refrigerants such as CFCs, HCFCs, HFCs, HCs, and their blends have all been used in various ways over the years. Some of these refrigerants are found to be a major threat to the environment, destroying the ozone layer and increasing global warming potential. Since that discovery, researchers have been working to produce new refrigerants that address the aforementioned environmental issues together while increasing the performance of existing systems. The use of nanofluids in refrigeration systems is one of these recent breakthroughs in refrigeration systems. Nanoparticles, which can only be measured on a nanoscale, are used to develop a nanofluid. Nano refrigerants are a colloidal suspension of nanoparticles in the base refrigerant and they gradually evolved as one of the promising efficient heat transfer fluids in various thermal engineering applications because of their improved thermophysical properties. This paper primarily focuses to examine and understand the effect of nanoparticles (such as TiO2, Al2O3, CuO, SiO2, ZnO, ZrO2, ZnO/SiO2, diamond, etc.), when integrated with regular refrigerants, on the performance of refrigeration systems using various parameters viz. pressures drop during suction and discharge, refrigeration effect, power consumption, and COP.
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