Eur. Phys. J. AP 8, 71-75 (1999)
https://doi.org/10.1051/epjap:1999231

Heat exchanger effectiveness in unsteady state

Laboratoire de Thermomécanique, UTAP, EA 2061, Faculté des Sciences, B.P. 1039, 51687 Reims, France

Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.

Received: 8 March 1999
Revised: 9 July 1999
Accepted: 16 July 1999
Published online: 15 October 1999

Abstract

A method is proposed to determine the thermal effectiveness of heat exchangers in situ, when one of the fluids is submitted to any kind of flow rate variations. It leads to the definition of the average effectiveness in unsteady state, which forms an extension of the classical effectiveness used in steady state. It requires an unsophisticated equipment of measurement and should lead to an easy and continuous control of the fouling of heat exchangers.