Dynamic simulation of horizontal condenser of R1233zd(E) high temperature heat pump

This paper presents the dynamic heat transfer model of a R1233zd(E) horizontal condenser. Compared with the steady-state model, the dynamic model has obvious advantages in predicting the system operating performance and understanding the working principle. This article introduces the equations, discrete methods and model calculation logic in detail. From the results, the state parameters of the refrigerant, tube wall, and cooling water in every control volume of the condenser at each time step can be obtained. Since the model covers the geometric parameters of the heat exchange tubes, the geometric parameters variation of the heat exchange tubes can cause the great effect of heat transfer performance of the condenser. The study compares the phase area, heating capacity and output water temperature under different heat exchange tubes. For the results, when a low-rib heat exchange tube with the fin pitch of 1.3 mm is used, the temperature of the outlet water is increased by more than 1.5℃ than that of the light tube, the time to reach stable output is more than 1 minute earlier, and the heating capacity is increased by 2.3 times. R1233zd(E) acts as a new environmental protection working fluid, and there are not too much studies about the heat pump model. So this condenser model is an important basis for the further research of R1233zd(E) high temperature heat pump. © 2021, Editorial Board of CIESC Journal. All right reserved.