PERFORMANCE EVALUATION OF TWO STAGE CASCADE REFRIGERATION SYSTEM USING NATURAL REFRIGERANTS

This paper deals with the performance evaluation of two stage cascade refrigeration system with three different natural refrigerants R290(propane), R600a(isobutane) and R1270(propene) in high temperature cycle cascaded independently with R1150(ethene) in low temperature cycle. Analysis of two stage cascade system is carried out with different parameters like mass ratio of refrigerants, total work, coefficient of performance of system and volumetric flow rate of refrigerant(HTC) at i) fixed evaporator temperature, fixed cascade condenser temperature and varying condenser temperature ii) fixed condenser temperature, fixed cascade condenser temperature and varying evaporator temperature and iii) fixed evaporator, fixed condenser temperature and varying cascade condenser temperature.