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Experimental investigation of local heat transfer coefficient for refrigerant flow boiling in microchannel cold plate evaporators.

Author(s) : BERTSCH S. S., GROLL E. A., GARIMELLA S. V.

Summary

The local two-phase heat transfer coefficient is the key parameter needed for accurate prediction of the heat transfer rate in microchannel cold plate evaporators used in electronics cooling systems. Many of the recent studies of the heat transfer coefficients in microchannel heat exchangers for electronics cooling were developed for water as the heat transfer fluid and in the subcooled or low vapour-quality region. In contrast, this study focuses on the investigation of the local flow boiling heat transfer coefficient at different vapour qualities (up to saturated vapour) of the refrigerant R-134a. An experimental setup was designed and built to measure the local heat transfer coefficient and to obtain a better understanding of the underlying physics. The evaporator considered contains 17 parallel microchannels which are each 762-micrometer wide and 1905-micrometer deep. The change in vapour quality across the test section was fixed to 20% in any given experiment. Measurements were conducted for several inlet vapor qualities ranging from subcooled liquid to a vapour quality of 80% at saturation temperatures between 10 and 30°C and refrigerant mass flow rates from 0.5 to 2 g/s.

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Pages: ICR07-B1-153

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Details

  • Original title: Experimental investigation of local heat transfer coefficient for refrigerant flow boiling in microchannel cold plate evaporators.
  • Record ID : 2007-2505
  • 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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