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Pool boiling heat transfer coefficients of hydrocarbon refrigerants on various enhanced tubes.

Author(s) : PARK H. S., PARK K. J., JUNG D.

Summary

In this work, pool boiling heat transfer coefficients (HTCs) of five hydrocarbon refrigerants of propylene, propane, isobutane, butane and dimethylether (DME) were measured at the liquid temperature of 7% on a 26fpi low fin tube, Turbo-B, and Thermoexcel-E tubes. All data were taken from 80 to 10 kW/m2 in the decreasing order of heat flux. Hydrocarbon refrigerants' data showed a typical trend that nucleate boiling HTCs obtained on enhanced tubes also increase with the vapour pressure. Fluids with lower reduced pressure such as DME, isobutane, and butane took more advantage of the heat transfer enhancement mechanism of enhanced tubes than those with higher reduced pressure such as propylene and propane. Finally, Thermoexcel-E showed the highest heat transfer enhancement ratios of 2.3-9.4 among the tubes tested due to its sub-channels and re-entrant cavities.

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Pages: ICR07-B1-494

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Details

  • Original title: Pool boiling heat transfer coefficients of hydrocarbon refrigerants on various enhanced tubes.
  • Record ID : 2008-0089
  • 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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