Modelling of viscosity equation for liquid-phase HCFO-1233zd(E)

Refrigerant is one source of greenhouse gas emissions affecting global warming. New eco-friendly refrigerants are needed to replace old-generation refrigerants. Trans-1-Chloro-3,3,3-trifluoropropene (HCFO-1233zd(E)) is an attractive refrigerant due to its low global warming and ozone depletion potential. It's thermophysical properties play an essential role in analyzing thermal and process systems. The viscosity can be derived using experiments or by using calculations. This research developed and evaluated an extended-corresponding state (ECS) and excess-entropy scaling (EES) models. The development of both models refers to the available viscosity experimental data. Symbolic regression is used in developing the EES model, whereas weighted regression is for the ECS model. Both models were evaluated and compared to each other to reveal their accuracy by comparing the available experimental data. The average absolute deviation of the developed ECS and EES models are 1.59% and 1.86%, respectively. By assessing the extrapolation behavior, both models can predict the viscosity of HCFO-1233zd(E) in the liquid phase from the triple point up to a temperature of 500 K and a pressure of 50 MPa.