Heat exchanger design based on minimum entropy generation

摘要

The paper deals with the rating of the performance of heat exchangers.Each attempt in augmenting the overall heat transfer coefficient is accompanied by an increase in the pressure drop.Based on this observation the paper points out that both processes-heat transfer across a finite temperature difference and friction have a common destructive effect that can be measured by the entropy generation.The paper discusses the possibility of designing or simulating the behaviour of an existing heat exchanger based on the number of entropy generation unit NSU.The correlation between the thermal efficiency of the heat exchanger and its constructive characteristics is based on the NTU-s method.The paper develops a correlation for calculating the entropy generation unit NSU function on the NTU number.The paper presents diagrams and methods for designing a heat exchanger for a specific number NSU or for simulating an existing design or physical heat exchanger.