Abstract
This experimental investigation exemplifies the design and testing of diffuser at compressor inlet and nozzle at condenser outlet in vapour compression refrigeration system with the help of R134a refrigerant. The diffuser with divergence angle of 12°,14° and the nozzle with convergent angle 12°,14° are designed for same inlet and outlet diameters. Initially diffusers are tested at compressor inlet diffuser is used with inlet diameter equal to exit tube diameter of evaporator and outlet tube diameter is equal to suction tube diameter of the compressor. Diffuser helps to increases the pressure of the refrigerant before entering the compressor it will be helps to reduces the compression work and achieve higher performance of the vapour compression refrigeration system. Then nozzles are testing at condenser outlet, whereas nozzle inlet diameter equal to discharging tube diameter of condenser and outlet diameter equal to inlet diameter of expansion valve. Additional pressure drop in the nozzle helped to achieve higher performance of the vapour compression refrigeration system. The system is analyzes using the first and second laws of thermodynamics, to determine the refrigerating effect, the compressor work input, coefficient of performance (COP).
Highlights
In vcr system, the refrigerant under goes phase changes from liquid to vapor and vapor to liquid in a closed cycle by absorbing the heat in the evaporator and reject the heat at condenser
G.Naga Raju et al [1] in this paper have studied enhancement of cop of vapour compression refrigeration system by using the diffusers at compressor inlet and as well as condenser inlet.When using the diffuser at compressor inlet the coefficient of performance is increased by 6% and using the diffuser at condenser inlet the coefficient of performance is increased by 3%
It was noted that the maximum percentage of reduction in compressor work and maximum percentage of coefficient of performance (COP) are obtained when we are using the 140 divergence angle of diffuser the COP increases when using 120 but maximum COP was obtained at 140 diffuser
Summary
The refrigerant under goes phase changes from liquid to vapor and vapor to liquid in a closed cycle by absorbing the heat in the evaporator and reject the heat at condenser. By using these two to evaluate the different parameters like coefficient of performance, refrigerating effect and compressor work of this system with the help of R134a refrigerant. Compared these parameters with convectional system the cop of modified system increased by approximately 1.14. Bala Kartheek et al.,[9] In this experiment evaluate the performance of the vapour compression refrigeration system by using the diffuser at condenser inlet and nozzle at inlet of the evaporator. The diffuser reduces the mechanical work required to the refrigerant and nozzle enhance the refrigeration effect by providing an increase in velocity to the refrigerant By using these two system performance is increased. It improve the refrigeration effect and increase the cop of the system increases
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