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The use of effectiveness concepts in the calculations of thermal resistance of parallel plate heat sinks

Deans, J. and Neale, J.D. and Dempster, W.M. and Lee, C.K. (2006) The use of effectiveness concepts in the calculations of thermal resistance of parallel plate heat sinks. Heat Transfer Engineering, 27 (5). pp. 56-67. ISSN 0145-7632

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Abstract

With this study, a new and more adaptable approach to the thermal design of the large heat sinks used in power electronics is proposed. This method, supported by the results from an extensive experimental program, recognizes that (1) the heat sink fins and the airflow adjacent to them form a simple cross-flow heat exchanger, and (2) conventional NTU-effectiveness methods can be adapted for use in the thermal analysis of the heat sink. This adaptation requires the development and evaluation of an equivalent heat capacity to describe the energy conducted along the fin. This method was initially used to evaluate the convective heat transfer coefficients between the fin and the cooling air. In this geometry, the developing airflow conditions make the prediction of representative values difficult. The correlation found to describe the test results was then used in an inverted analysis to predict and compare the experimental values for the heat sinks thermal resistance. The method is finally used in a design example where the fin spacing is optimized for a particular test duty. It is concluded that this new approach will make the design of large heat sinks more robust and reliable.

Item type: Article
ID code: 5041
Keywords: heat transfer, thermal resistance, heat transfer engineering, Mechanical engineering and machinery, Mechanical Engineering, Fluid Flow and Transfer Processes, Condensed Matter Physics
Subjects: Technology > Mechanical engineering and machinery
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 20 Dec 2007
    Last modified: 04 Sep 2014 17:23
    URI: http://strathprints.strath.ac.uk/id/eprint/5041

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