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Condensation heat transfer and pressure drop of R-134a in annular helicoidal pipe at different orientations.

Author(s) : LIN C. X., EBADIAN M. A.

Type of article: Article

Summary

Experimental investigations were conducted to determine the condensation heat transfer and pressure drop of refrigerant R-134a in annular helicoidal pipe at three inclination angles. The experiments were performed with the Reynolds number of R-134a ranging from 60 to 200, and that of cooling water from 3600 to 22000; temperatures of R-134a at 30 and 35°C, and cooling water at 16, 20 and 24°C. The experimental results indicated that the refrigerant Nusselt number was larger at lower refrigerant saturation temperature, and would increase with the increase of mass flow rates of refrigerant and cooling water. It was found that the refrigerant heat transfer coefficient of annular helicoidal pipe could be two times larger than that of equivalent plain straight pipe when the refrigerant Reynolds number was larger than 140. Comparison with identical helicoidal pipe with opposite flow channel arrangement revealed that the refrigerant heat transfer rate was larger when the refrigerant was flowing in the annular section at the cooling water Reynolds number larger than 4000, but the pressure drop was always larger in this flow channel arrangement. [Reprinted with permission from Elsevier. Copyright, 2007].

Details

  • Original title: Condensation heat transfer and pressure drop of R-134a in annular helicoidal pipe at different orientations.
  • Record ID : 2008-0516
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 50 - n. 21-22
  • Publication date: 2007/10

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