A REVIEW ON COMPARATIVE THERMODYNAMIC PERFORMANCE ANALYSIS OF A CASCADE SYSTEM USING DIFFERENT REFRIGERANT COUPLES

As a result of environmental problems related to global warming and depletion of the ozone layer caused by the use of synthetic refrigerants (CFC's, HCFC's and HFC's) experienced over the last decades, the return to the use of natural substances for refrigeration purposes appears to be sound practice. It must be a better solution to use naturally existing and environmentally harmless substances as alternatives refrigerants in refrigeration systems. Cascade refrigeration system is the combination of two refrigeration cycle for maximum refrigeration effect can be obtained. This system is developed to achieve temperature up to -40 to -80°C for the applications like cold storage in malls and stores and in blood banks. These fluids are harmless to environment and GWP and ODP is negligible and do not violate the Kyoto protocol. COP, work done, Refrigeration effect are the parameters studied from the system. The concept is that the cooling produced in first cycle evaporator is used to cool the condenser of second cycle, which reduces the cooling capacity in condenser and enables to produce very low temperature for various cold storage applications.