A numerical investigation of the geometric effects on the performance of plate finned-tube heat exchanger

This study numerically examines the geometric parameters on the performance of a two-row fin-and-tube heat exchanger. Effects of fin pitch, tube pitch, fin thickness, and tube diameter are termed with. The simulation indicates that the performance, in terms of Q/ΔP and COP, increases with longitudinal tube pitch or with transverse tube pitch, and it decreases with larger tube diameter or fin thickness. An optimum value for Q/ΔP occurs at a 6–8 fpi at a fixed flow rate condition. There is not much difference in choosing the index of Q/ΔP or COP under fixed flow rate condition. However, when the simulation are performed with the actual axial fan whose P–Q curve being implemented. It is found that Q/ΔP peaks at 12 fpi while COP peaks at 16 fpi.