External heating effects on the effectiveness-NTU relationship of a counterflow microchannel heat exchanger

B. Mathew, H. Hegab

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

5 Citations (Scopus)

Abstract

The effect of external heating on the effectiveness of microchannel heat exchangers is experimentally studied in this paper. Two stream symmetric, indirect-contact counterflow microchannel heat exchangers were fabricated that provided a range of NTU values from 0.35 to 1.44. Results are presented as a plot between two nondimensional terms (effectiveness and NTU), there by generalizing the results for application to any coolant and microchannel heat exchangers. The heat exchangers were tested for balanced flow condition by supplying external heating at rates of 0%, 15% and 25% with respect to the maximum heat transfer rate thermodynamically possible between the two fluid streams. The heat exchanger effectiveness was reduced by 11-16% and 16-27% by the applied 15% and 25% external heating rates, respectively.

Original languageEnglish
Title of host publicationProceedings of 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Microelectromechanical Systems
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Print)0791837904, 9780791837900
Publication statusPublished - 2006
Externally publishedYes
Event2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Chicago, IL, United States
Duration: Nov 5 2006Nov 10 2006

Publication series

NameAmerican Society of Mechanical Engineers, Micro-Electro Mechanical Systems Division, (Publications) MEMS
ISSN (Print)1096-665X

Other

Other2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006
Country/TerritoryUnited States
CityChicago, IL
Period11/5/0611/10/06

ASJC Scopus subject areas

  • Engineering(all)

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