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Design considerations for the sizing of high-effectiveness two-phase flow heat exchangers.

Number: pap. ID: 476

Author(s) : PACIO J., DORAO C.

Summary

Two-phase flow heat exchangers are main components in refrigeration, cryogenic and liquefaction processes, since thermo-economic considerations make low-temperature processes very sensitive to their performance. Current models used for design, based on integrated or discretized energy balances, fail to take into account all the relevant physical effects. In this work, a tube-in-tube exchanger is studied on the base of differential mass, momentum and energy balances, thus accounting for changes in pressure which affect the saturation temperature. Three numerical examples are presented, involving evaporators and condensers. The present model predicts up to larger area than traditional discretized models for condensers, and smaller for evaporators. These results can be explained by observing the temperature profiles. In addition, the reduction of performance if the heat exchanger is under-sized is evaluated. Finally, co-current and counter-current flow arrangements are compared.

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Pages: 8 p.

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Details

  • Original title: Design considerations for the sizing of high-effectiveness two-phase flow heat exchangers.
  • Record ID : 30003199
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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