A New Simple Method for Estimating Exergy Destruction in Heat Exchangers

Entropy

Ignacio López Paniagua¹  Javier Rodríguez Martín²  Celina González Fernandez²  Ángel Jiménez Álvaro² 

[1] Energy and Fluid Mechanics Department (ETSII), Universidad Politécnica de Madrid, JoséGutiérrez Abascal 2, 28006 Madrid, Spain;

关键词: irreversibility;    second law analysis;    heat exchanger;    thermodynamics;    heat transfer;   

DOI  :  10.3390/e15020474

来源: mdpi

【 摘 要 】

This paper presents an abbreviated method for estimating exergy destruction in a heat exchanger, requiring only black-box data of the exchanger’s inputs and outputs, and eliminating part of the mathematical difficulties associated with the calculations. A well-known model for temperature distributions in an exchanger is adapted for this case, and is used to distinguish between the contributions of the three major causes of the total exergetic loss: heat transfer, fluid friction and energy dissipation to the surroundings. This provides insight into the relative importance of the three, allowing for identification of potential improvements to a given design.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.