文档介绍：International Journal of Thermal Sciences 59 (2012) 203e213
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International Journal of Thermal Sciences
journal homepage: ate/ijts
New integral-mean temperature difference model for thermal design and
simulation of parallel three-fluid heat exchanger
Min Zhao, Yanzhong Li*
School of Energy and Power Engineering, Xi’ an Jiaotong University, Xi’ an 710049, China
article info abstract
Article history: As we know, the mean temperature difference approach perfectly solves the problem of thermal design
Received 8 October 2011 of a two-fluid heat exchanger. However, so far, the equivalent method has not been found for that of
Received in revised form three-fluid heat exchanger. In this paper, a mean temperature difference method called IMTD (integral-
20 April 2012
mean temperature difference) is developed in detail for a parallel stream three-fluid heat exchanger with
Accepted 20 April 2012
munications. It includes the derivation of IMTD formulae, the illustration of design and simu-
Available online 30 May 2012
lation procedures of IMTD thermal model, the corresponding exemplary calculations and discussion, and
the validation of IMTD thermal model. The research shows that the derived IMTD formulae and accel-
Keywords:
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Three-fluid heat exchanger erated method proposed in the present IMTD model signi cantly improve the design process in the past
Thermal design and simulation analytical models. It realizes a fast convergence which is usually within 10 steps for all parallel stream
Integral-mean temperature difference flow arrangements. Moreover, the present model has the same accuracy as past exact analytical models
and simultaneously can parable to past approximate analytical models in simplicity.
Ó 2012 Elsevier Masson SAS. All rights reserved.
1. Introduction parallel stream flow arrangements. Sorlie [6] developed a design
theory of the cocurrent and countercurrent parallel three-fluid heat