Investigation of Combined Heat and Mass Transfer from a Wet Heat Exchanger. Part 1. Formulation of an Approximate Heat/Mass Transfer Model for Calculating the Performance of Heat Exchangers in Dry/Wet Operation

摘要

An approximate analytical model is described that may be used to calculate the rates of heat transfer and evaporation from the surface of a wet finned heat exchanger. The model is analogous to the conventional expression for convective heat transfer. However, the driving potential is an enthalpy difference instead of a temperature difference. The overall heat transfer coefficient can be computed in the usual manner using a simple transformation of variables. The value of the model is that wet heat exchanger performance can be estimated accurately using dry performance data. (ERA citation 08:024110)