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Longitudinal heat conduction in finned-tube evaporators.

Author(s) : DOMANSKI P. A., CHOI J. M., PAYNE W. V.

Summary

The paper evaluates performance of finned-tube evaporators at different refrigerant exit superheats to assess the impact of longitudinal heat conduction on capacity. A combination of capacity measurements obtained from laboratory testing, the pattern of measured return bend temperatures, and the theoretical analysis suggests the occurrence of tube-to-tube transfer via fins and rejects the tube longitudinal heat transfer as the possible causes of capacity degradation. The impact of tube-to-tube heat transfer was negligible in tests with a uniform 5.6°C superheat, but it was significant in tests involving 16.7°C superheat. The measured difference in capacity between two evaporators, in one of which tube-to-tube heat transfer was prevented by cuts in common fins, was as much as 23%. The level of capacity degradation was affected by air volumetric flow rate.

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Pages: ICR07-B2-532

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Details

  • Original title: Longitudinal heat conduction in finned-tube evaporators.
  • Record ID : 2008-0087
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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