Research on the Heat Transfer Enhancement Evaluation Criterion of Heat Exchanger Based on Entransy Theory

doi:10.7652/xjtuxb201601001

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Research on the Heat Transfer Enhancement Evaluation Criterion of Heat Exchanger Based on Entransy Theory

更新时间：2025-07-09

- Research on the Heat Transfer Enhancement Evaluation Criterion of Heat Exchanger Based on Entransy Theory
- Vol. 50, Issue 1, Pages: 1-7+15(2016)
- 作者机构：
  
  西安交通大学化学工程与技术学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201601001
  CLC： TK464
- Online First：10 January 2016，
  
  Published：2016
- 稿件说明：
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Research on the Heat Transfer Enhancement Evaluation Criterion of Heat Exchanger Based on Entransy Theory[J]. 2016, 50(1): 1-7+15.
DOI：

Research on the Heat Transfer Enhancement Evaluation Criterion of Heat Exchanger Based on Entransy Theory[J]. 2016, 50(1): 1-7+15. DOI： 10.7652/xjtuxb201601001.

摘要

对于现有的理论只考虑了换热器换热量或传热温差的影响

而没有考虑压降和泵功的问题

分析和推导得出两种新的评价指标E

2/3

和E

并命名为EPEC(entransy performance evaluation criterion)指标

分别表征了单位压降和单位泵功下的换热量

这对换热器传热强化性能评价工作具有重要的参考价值。同时

对18°和27°平面螺旋折流板换热器和折面螺旋折流板换热器的实验结果分别进行了基于热力学第一定律、热力学第二定律以及新的理论评价指标的分析

研究表明:E

2/3

和E

与单位压降和单位泵功下的换热量随有效度的变化趋势基本一致

验证了新评价指标的有效性和可靠性。不同评价指标均从不同方面反映了换热器的性能

同时也说明了不同评价指标之间的差异和针对不同换热器不同工况统一标准的必要性。

Abstract

In consideration of the fact that present entransy theory only paid attention to the influence of heat exchange amount or heat transfer temperature difference

without taking into account the pressure drop and pump power

we analyzed and derived two entransy evaluation criteria EPEC(entransy performance evaluation criterion)related to heat transfer entransy dissipation and resistance entransy dissipation

which represent the heat transfer capacities under unit pressure drop and pump power

respectively. These two evaluation criteria have important reference value to the performance evaluation of enhanced heat transfer.

In addition

this paper also analyzed the experimental results of the 18° and 27° plane helical baffle heat exchanger and folding helical baffle heat exchanger based on the first and second laws of thermodynamics and the new entransy evaluation indicators. The results show that the changing tendencies of E

2/3

and E

with the effective degree are in good agreement with that of the heat transfer under unit pressure drop and pump power

verifying the validity and reliability of the new evaluation indicators. Different evaluation indicators reflect the performance of heat exchanger in different ways

which also illustrate the difference between different evaluation criteria and the necessity to unify the evaluation criteria for different heat exchangers under various working conditions.

关键词

Keywords

references

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