Thermodynamic analysis of a sub-coolant heat pump

Due to increasing energy costs and global warming problems, the search for alternative cycles and fluids in heat pump systems, where the damage to the environment is low and the system heating capacity is high, continues rapidly. Fluids with a lower GWP value are preferred instead of fluids with high global warming potential (GWP). The fact that R32 has a GWP value of 675 and an ozone depletion potential (ODP) of 0 brings it closer to the preferred fluid position among alternative fluids. In this study; In order to increase the performance in heat pump systems, it has been considered appropriate to place a lower circuit heat pump loop in the system to ensure that the high temperature fluid exiting the condenser of a standard heat pump loop can enter the evaporator into the evaporator. low temperature.. Thermodynamic analyzes of R32, R717 and R290 fluids at the same temperature were made in the downstream heat pump circuit. Computer program called Engineering Equation Solver (EES) was used for calculations. Shows the temperature performance drop (COPıp) to the evaporator and condensers for liquids for calculations in the heat pump. Downstream evaporator heat pump using R32 fluid has 5-10% higher performance than the standard heat pump. Downstream heat pumps benefit from overheating due to their high heating performance.