The purpose of this undertaking is to show that the COP ofvapour compression refrigeration system can be increased by installing a diffuser between the evaporator and the compressor. The sphere of diffuser is gradually decreasing, thereby pressure sensation raise. Already pressure overhead refrigerant is then sent to the compressor. In this way the work done of compressor is reduced for the same refrigeration effect and also energy is conserved. The experimental solution from vapour

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... n system with R290 refrigerant set up (at Thermal laboratory , NEC Erode) was taken where the variables like suck pressure of compressor, delivery pressure of compressor, temperature of evaporator and condenser are noted down. After calculation the COP was found to be increased from 6 .94 to 7.446 when diffuser was used.