Cop Enhancement of Vapour Compression Refrigeration System

This experimental investigation exemplifiesthe design and testing of diffuser at compressor inlet andnozzle at condenser outlet in vapour compressionrefrigeration system with the help of R134a refrigerant. Thediffuser with divergence angle of 12°,14° and the nozzlewith convergent angle 12°,14° are designed for same inletand outlet diameters. Initially diffusers are tested atcompressor inlet diffuser is used with inlet diameter equalto exit tube diameter of evaporator and outlet tube diameteris equal to suction tube diameter of the compressor.Diffuser helps to increases the pressure of the refrigerantbefore entering the compressor it will be helps to reducesthe compression work and achieve higher performance ofthe vapour compression refrigeration system. Then nozzlesare testing at condenser outlet, whereas nozzle inletdiameter equal to discharging tube diameter of condenserand outlet diameter equal to inlet diameter of expansionvalve. Additional pressure drop in the nozzle helped toachieve higher performance of the vapour compressionrefrigeration system. The system is analyzes using the firstand second laws of thermodynamics, to determine therefrigerating effect, the compressor work input, coefficientof performance (COP).