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Effect of Inlet Direction on the Refrigerant Distribution in a Parallel Flow Minichannel Heat Exchanger

[+] Author Affiliations
Nae-Hyun Kim, Do-Young Kim, Ho-Won Byun, Yong-Min Choi

University of Incheon, Incheon, Republic of Korea

Paper No. ICNMM2009-82051, pp. 753-758; 6 pages
doi:10.1115/ICNMM2009-82051
From:
  • ASME 2009 7th International Conference on Nanochannels, Microchannels, and Minichannels
  • ASME 2009 7th International Conference on Nanochannels, Microchannels and Minichannels
  • Pohang, South Korea, June 22–24, 2009
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 978-0-7918-4349-9 | eISBN: 978-0-7918-3850-1
  • Copyright © 2009 by ASME

abstract

The refrigerant R-134a flow distributions are experimentally studied for a round header/ten flat tube test section simulating a brazed aluminum heat exchanger. Three different inlet orientations (parallel, normal, vertical) were investigated. Tests were conducted with downward flow for the mass flux from 70 to 130 kg/m2 s and quality from 0.2 to 0.6. In the test section, tubes were flush-mounted with no protrusion into the header. It is shown that normal and vertical inlet yielded approximately similar flow distribution. At high mass fluxes or high qualities, however, slightly better results were obtained for normal inlet configuration. The flow distribution was worst for the parallel inlet configuration. Possible explanation is provided based on flow visualization results.

Copyright © 2009 by ASME

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