Performance of Vapour Compression Refrigeration System with Sub Cooling by Use of R134a and R600a Refrigerants

There are various obstacles faced in working of different refrigerants due to their environmental impact (R 11, R12), toxicity (NH3), Flammability (HC) and high pressure (CO2); which makes them more hazardous than other working fluids according to safety and environmental issues. Performance analysis on a vapour compression refrigeration system with eco-friendly refrigerant of HC600a were done and their results were compared with R134a as possible alternative replacement. In present work experimental setup is prepared for both existing and proposed system with R-134a and R-600a as refrigerants. In the proposed system suction line heat exchanger of 35cm length is used. After conducting the experiment, - In the proposed system the coefficient of performance is found to be greater than the coefficient of performance of existing system. The percentage of increase in COP using R-134a in no load condition is 3.27% and in loaded condition is 3.10%. - In the proposed system the coefficient of performance is found to be greater than the coefficient of performance of existing system. The percentage of increase in COP using R-600a in no load condition is 4.09% and in loaded condition is 3.34%. - From the above discussions, it can be concluded that the performance of vapour compression refrigeration system of domestic refrigerator can be increased by using 35cm length of a heat exchanger for different refrigerants. - The retrofitting of R600a in all conditions showed better performance than R134a. And also that if care is taken in flammable of R600a retrofitting gives better performance with R600a in domestic R134a systems.