The inaccuracy of conventional one-dimensional parallel thermal resistance circuit model for two-dimensional composite walls

King Leung Wong, Tsung Lieh Hsien, Ming Chien Hsiao, Wen Lih Chen, Ku Chin Lin

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

This investigation is to show that two-dimensional steady state heat transfer problems of composite walls should not be solved by the conventionally one-dimensional parallel thermal resistance circuits (PTRC) model because the interface temperatures are not unique. Thus PTRC model cannot be used like its conventional recognized analogy, parallel electrical resistance circuits (PERC) model which has the unique node electric voltage. Two typical composite wall examples, solved by CFD software, are used to demonstrate the incorrectness. The numerical results are compared with those obtained by PTRC model, and very large differences are observed between their results. This proves that the application of conventional heat transfer PTRC model to two-dimensional composite walls, introduced in most heat transfer text book, is totally incorrect. An alternative one-dimensional separately series thermal resistance circuit (SSTRC) model is proposed and applied to the two-dimensional composite walls with isothermal boundaries. Results with acceptable accuracy can be obtained by the new model.

Original languageEnglish
Pages (from-to)2554-2562
Number of pages9
JournalEnergy Conversion and Management
Volume49
Issue number10
DOIs
Publication statusPublished - 2008 Oct

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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