Vapour compression refrigeration cycle stands as a cornerstone in the field of refrigeration and air conditioning. In this research paper, we are concluding multiple experiments done on vapour compression refrigeration test rig. These experiments helped us to understand the flow of refrigerant in different components of refrigeration cycle. There are many methods to increase the performance of VCRS. Sub-cooling is one of the methods to increase the performance of any vapour compression refrigeration system. In this research paper, experiments were performed on VCR cycle with dedicated mechanical sub-cooler. Here, two simple VCRS cycles are used together. Experiment shows that COP of simple VCRS is lower than VCRS with dedicated mechanical sub-cooler. In these experiments, COP has increase of 22% and evaporator entry temperature can be reduced up to 7 °C after applying sub-cooler with simple VCR cycle. Results are compared for actual COP and Carnot COP. Universal 16 channel data logger with PC version is used to extract the data in PC, this makes the analysis part easy. We have generated graphs to analyse the degree of subcooling, decrease in evaporator temperature, etc.