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The performance of novel compact heat exchangers with highly extended surfaces

Authors
Journal
Applied Thermal Engineering
1359-4311
Publisher
Elsevier
Publication Date
Volume
16
Issue
3
Identifiers
DOI: 10.1016/1359-4311(95)00072-0
Keywords
  • Intensification
  • Evaporator
  • Absorber
  • Turbulence Promoter

Abstract

Abstract The performance of highly extended surface heat exchangers has been evaluated in two heat pump applications: as the evaporator in a compression heat pump and as the absorber in an absorption heat transformer. Film heat transfer coefficients based on the equivalent plain tube area (p.t.a.), ranged from 200 W m −2 K −1, for gas-liquid contact, to 3800 Wm −2 K −1, in the evaporation of a liquid stream. Another measure of the heat transfer characteristics of the exchangers were the ‘ UA o’ values, which were significantly better than the theoretical values calculated for each operation. The experimental results ranged from 12 W K −1 (gas) to 214 W K −1 (evaporation), while the theoretical values were 1 W K −1 (gas) and 43 K −1 (evaporation).

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