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An experimental study on the evaporative heat transfer enhancement for R410A with pulsating effect in horizontal smooth and micro-fin tubes.

Author(s) : CHO J. M., CHOI J. W., KIM D. H., et al.

Summary

There have been several studies for heat transfer enhancement using various methods such as micro-fin tube. In this study, evaporative heat transfer enhancement for R410A in horizontal smooth and micro-fin tubes is investigated under pulsating flow conditions with various frequencies and amplitudes. Smooth and micro-fin tubes with outer diameters of 5 mm and length of 1.44 m were selected as test tubes. The tests were conducted at mass flow rates of 1.4, 4.0, and 6.0 g/s, saturation temperature of -5°C and heat flux of 20 kW/m2. The pulsating conditions were varied from 1 to 8 Hz for frequencies as well as for amplitudes of 1 and 2 mm. The pulsation definitely contributed to the heat transfer enhancement for most test conditions, and this method can be used to save energy.

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Pages: 2009-5

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Details

  • Original title: An experimental study on the evaporative heat transfer enhancement for R410A with pulsating effect in horizontal smooth and micro-fin tubes.
  • Record ID : 2009-1939
  • Languages: English
  • Source: 3rd Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Publication date: 2009/06/23

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