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Thermal Performance of Counter Flow Microchannel Heat Exchangers Subjected to Axial Heat Conduction and External Heat Transfer

[+] Author Affiliations
B. Mathew, H. Hegab

Louisiana Tech University, Ruston, LA

Paper No. HT2009-88250, pp. 637-646; 10 pages
doi:10.1115/HT2009-88250
From:
  • ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences
  • Volume 1: Heat Transfer in Energy Systems; Thermophysical Properties; Heat Transfer Equipment; Heat Transfer in Electronic Equipment
  • San Francisco, California, USA, July 19–23, 2009
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-4356-7 | eISBN: 978-0-7918-3851-8
  • Copyright © 2009 by ASME

abstract

The thermal model of a balance counter flow microchannel heat exchanger subjected to external heat transfer and axial heat conduction is modeled in this paper. Three governing equations are developed, one for each of the two fluids and the third for the wall separating the fluids. The ends of the wall separating the fluids are assumed to be insulated. The equations are solved numerically using finite difference method. The model developed in this paper is verified using the conventional effectiveness-NTU equations and existing models that consider each of these effects individually. The combined effect of axial heat conduction and external heating always degraded the hot fluid effectiveness for all values of NTU. Irrespective of NTU the cold fluid effectiveness either increased or decreased depending on whether the degradation in heat gain due to axial heat conduction was compensated by external heat transfer.

Copyright © 2009 by ASME

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