Effectiveness of parallel flow microchannel heat exchangers with external heat transfer and internal heat generation

B. Mathew, H. Hegab

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

In this paper the thermal performance of balanced parallel flow microchannel heat exchangers subjected to external heat transfer and internal heat generation have been numerically analyzed. The governing equations were numerically solved to obtain the axial temperatures of the fluids. The effectiveness of each fluid was determined using the inlet and outlet temperatures obtained from the numerical analysis. Moreover, the heat transferred between the individual fluids and the ambient as well as that between the fluids were numerically determined. The effectiveness depended on NTU, ambient temperature, thermal resistance between the ambient and the fluids, and the internal heat generation. When NTU is zero, the effectiveness depends only on the internally generated heat. At a particular ambient temperature and NTU the effectiveness of the hot and cold fluids degraded and improved, respectively, with increase in the internally generated heat. On the other hand with increase in ambient temperature the effectiveness of the hot and cold fluids decreased and increased, respectively, for a specific amount of heat generation. The model developed in this paper has been validated using existing models which consider the individual effect of external heat transfer and internal heat generation on the performance of parallel flow microchannel heat exchangers.

Original languageEnglish
Title of host publication2008 Proceedings of the ASME Summer Heat Transfer Conference, HT 2008
Pages175-184
Number of pages10
Publication statusPublished - 2009
Externally publishedYes
Event2008 ASME Summer Heat Transfer Conference, HT 2008 - Jacksonville, FL, United States
Duration: Aug 10 2008Aug 14 2008

Publication series

Name2008 Proceedings of the ASME Summer Heat Transfer Conference, HT 2008
Volume2

Conference

Conference2008 ASME Summer Heat Transfer Conference, HT 2008
Country/TerritoryUnited States
CityJacksonville, FL
Period8/10/088/14/08

Keywords

  • Effectiveness
  • Heat Exchangers
  • Heat transfer
  • Microchannels
  • NTU

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering

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