Transients in Plate-fin Heat Exchangers - Analytical Solution Considering the Dynamic Behaviour of Fins

摘要

A mathematical model considering the dynamic characteristics of fins is used to predict the transient temperature responses of plate-fin heat exchangers. The effects of the flow mal-distributions are taken into account by adding the axial dispersion terms into the governing equation system. The effect of the lateral heat conduction resistance along the fins is investigated by solving the temperature dynamics in the fluid, separating plates and fins simultaneously. The analysis solution is obtained in real time domain by means of Laplace transform and numerical inverse transform algorithms.