Compression ratio is the key parameter in performance optimization of hybrid refrigeration cycle

Abstract

Now a day vapor compression cycle is used for all purpose of cooling technology. The major issues in vapor compression are uneven supply of electricity and the use of environment friendly refrigerant. The absorption refrigeration cycle is one of the alternatives to reduce electric energy demand and the sustainable development. To overcome the problem of low coefficient of performance and to get refrigeration temperature below 0°C, hybrid refrigeration cycle is proposed. In absorption refrigeration system the pressure difference between evaporator –absorber, circulation ratio and the generator temperature are more significant. In hybrid refrigeration system the absorber is at higher pressure than the evaporator which helps not only in increasing the pressure difference between evaporator and absorber but also to achieve low refrigeration temperature. The biggest advantage hybrid cycle is that it can run at low generator temperature. The effect of compression ratio on cycle performance was analyzed. There is an optimum value of compressor ratio up to which the rise of compressor work is less as compared to the rise of ultimate COP. for the hybrid cycle temperature of generator, condenser and evaporator is 90°C, 30°C,-10°C respectively and the optimum value of compressor ratio obtained is 2.5 to 3