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Pool-boiling heat transfer from horizontal tubes to alternative refrigerants.

Author(s) : GORENFLO D.

Summary

Pool-boiling heat transfer from single plain tubes with widely differing diameters and from single-finned tubes with enhanced surfaces were studied, along with the heat transfer caused by the additional convection of the bubbles and liquid streaming upwards within a tube bundle. The boiling liquids were propane, n-butane, n-hexane, propane-n-butane mixtures, and the partly fluorinated refrigerants R134a, R152a, a mixture of R134a-R152a and R227. The results show that the influence of the tube diameter on nucleate boiling heat transfer is much smaller than indicated in some of the literature. Roughly speaking, there is practically no influence at intermediate heat fluxes over a wide pressure range, while a big diameter is favourable at small fluxes and low pressures, and it is a disadvantage at high fluxes and high pressures.

Details

  • Original title: Pool-boiling heat transfer from horizontal tubes to alternative refrigerants.
  • Record ID : 1995-0119
  • Languages: English
  • Source: Proceedings of international seminar on heat transfer, thermophysical properties and cycle performance of alternative refrigerants.
  • Publication date: 1993/12/06
  • Document available for consultation in the library of the IIR headquarters only.

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