4.1. Plate Heat Exchanger (Evaporator and Recuperator) and Fin-Tube Air-Cooled Heat Exchanger
(Condenser)
In the evaporator, the refrigerant gains heat from heat source fluid. The refrigerant enters and exits the evaporator as a two-phase fluid. Therefore, the evaporator has only one flow zone as shown in Figure 3-a. In order to model the heat transfer in the evaporator, heat balance between the refrigerant, plate's wall, and oil should be solved to predict the evaporator outlet condition as below: