A new moving boundary model for evaluating the performance of wet fins: Application to minichannel evaporators

Abstract

In this paper, firstly, an innovative numerical model (Fin1D-MB) for wet fins of a minichannel evaporator was developed and verified. The proposed model is based on fin theory in conjunction with the moving boundary (MB) technique between wet and dry portions along the fin height. Secondly, a comparative study between the Fin1D-MB model and a comprehensive two-dimensional model (Fin2D-W) was implemented under different dehumidifying conditions. The results showed a good agreement between the two models in predicting the fin temperature profile and dehumidifying condition. However, the Fin1D-MB model saved computational cost by up to 95%, compared to the Fin2D-W model. Nevertheless, the relative deviations in the air-side heat transfer rates should be taken into consideration, especially in the partially wet fin region. The main source of these deviations is the assumption of uniform air temperature and humidity ratio along the fin height used by the Fin1D-MB model.