Numerical Simulation on the Performance of Air-Air Primary Surface Heat Exchanger

A design software was written for the air-air primary surface heat exchanger (PSHE) based on the heat balance equation and the theory of micro channel. The two different simplified models, the quarter channel and the full channel PSHE of 0° counter-flow and the model of the full channel cross-flow PSHE with cross angle of 45° under high Reynolds number are simulated. This paper presents the comparison between the results obtained by the numerical simulation at the outlet of the PSHE and the results obtained by the thermal calculation software. The results showed that the numerical simulation is consistent with the thermal calculation of the software. Compared to the PSHE of 0°, the results of PSHE with the cross angle of 45° showed that the heat transfer performance is enhanced while the pressure drop was significantly increased.