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Effect of twisted tape insert on heat transfer and pressure drop in horizontal evaporators for the flow of R134a.

Author(s) : AKHAVAN-BEHABADI M. A., KUMAR R., MOHAMMADPOUR A., et al.

Type of article: Article, IJR article

Summary

An experimental study has been carried out on the heat transfer enhancement and pressure drop characteristics in presence of twisted tape inserts, during flow boiling of R134a, inside a horizontal evaporator. The test-evaporator was an electrically heated 1260 mm long copper tube with 7.5 mm inside diameter. The experiments were performed for plain flow and four tubes with twisted tapes of 6, 9, 12 and 15 twist ratios and four refrigerant mass velocities of 54, 85, 114 and 136 kg/s.m2 for each tape. It has been found that the twisted tape inserts enhance the heat transfer coefficient on relatively higher pressure drop penalty, in comparison to that for the plain flow.

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Pages: 922-930

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Details

  • Original title: Effect of twisted tape insert on heat transfer and pressure drop in horizontal evaporators for the flow of R134a.
  • Record ID : 2009-1460
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 32 - n. 5
  • Publication date: 2009/08

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