Boiling heat transfer of R32 and R22 in spiral corrugated tube with a vertical groove

In this paper, a three-dimensional steady-state boiling model of the spiral corrugated tube with a vertical groove is established by ANSYS Fluent 18.0. The model is a double tube structure, the water flow in the outer tube, the refrigerant flow in the inner tube, and the inner tube is a new type of spiral corrugated tube with a vertical groove inside the groove. Firstly, the physical properties difference between R32 and R22 is analyzed. Subsequently, the boiling heat transfer characteristics of R22 and R32 in the vertical groove inner spiral corrugated tube with different pipe diameters are studied, including the velocity of the inner pipe, the Reynolds number of the outer pipe, and the saturation temperature. Therefore these studies have laid the foundation for the application of R32 in double-tube heat exchangers.