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Experimental investigation of frost growth on microchannel heat exchangers.

Number: pap. n. R21, 2416

Author(s) : MOALLEM E., CREMASCHI L., FISHER D. E.

Summary

In this paper, new measurements of frost nucleation time and growth rate on a small 0.3m by 0.3m microchannel heat exchanger are presented. During the data reduction, fin surface temperature, uniform air temperature distribution, air lift and drag effects, and air velocity distribution were carefully evaluated and taken into consideration. The microchannel fin surface temperature, entering air face velocity, relative humidity and the amount of water retained within the fins were varied in a parametric fashion in order to identify the predominant factors affecting the frosting performance. Results show that the water retention and air face velocity do not have a significant impact on the frosting cycle while surface temperature and air relative humidity affect the frosting time considerably. Digital videos of frost formation confirmed that frost does not nucleate from large water droplets within the fins but mainly from the leading edges at the front of the fins.

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Pages: 8 p.

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Details

  • Original title: Experimental investigation of frost growth on microchannel heat exchangers.
  • Record ID : 30000970
  • Languages: English
  • Source: 2010 Purdue Conferences. 13th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2010/07/12

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