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The considerations of heat and exergy balance for heat exchangers.

Author(s) : YOU Y., HU E. J.

Summary

From the view of balancing exergy and heat transfer, the paper discusses the temperature difference and the temperature relationship for heat exchangers. The analysis shows that the temperature difference for low-temperature heat exchangers (e.g. evaporators) should be made small to 'save' the quality of the heat transferred and can be large for high-temperature heat exchangers (e.g. condensers) to reduce the transfer area. The optimal temperature difference can be determined from thermo-economic consideration. The study also discloses that the exergy losses of a heat transfer process between two streams in a recuperator relate to the ratios of the two temperature differences at the two ends of the heat exchanger even with the same log mean temperature difference.

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Details

  • Original title: The considerations of heat and exergy balance for heat exchangers.
  • Record ID : 2000-1253
  • Languages: English
  • Source: 20th International Congress of Refrigeration: Refrigeration into the Third Millennium.
  • Publication date: 1999/09/19

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