There are many applications where refrigeration plant is required to meet the various refrigerating loads at different temperatures. For example, systems for hotels, large restaurant, institutions and food preservation industries. In these cases, it is necessary that each location is cooled by separate evaporators to maintain the particular temperature and produce the required refrigeration load. Hence it requires different refrigerating units with single evaporator for each location. Instead it will be beneficial to use a refrigerating unit with multiple evaporators working at different temperatures. Therefore, it is the purpose of this paper to introduce vapor compression system which uses a single compressor and individual expansion devices to provide the concurrent testing. Also we have to analyse the performance of the refrigeration system when different refrigerants are used in the same system with changing suction and discharge pressure. The performance parameters will be COP & the refrigerating effect obtained at evaporator.