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Review on pool boiling heat transfer of carbon dioxide.

Author(s) : GORENFLO D., KOTTHOFF S.

Type of article: Article, IJR article

Summary

Although application of carbon dioxide as working fluid in many fields of refrigeration technology has been recommended very often in recent past, the data on nucleate boiling heat transfer of carbon dioxide in free convection are very scarce in the open literature and new investigations are almost entirely focussed on forced convective flow boiling. In the interpretation of the respective results, heat transfer to carbon dioxide is often characterized as being superior to other refrigerants due to the outstandingly favourable thermophysical properties of carbon dioxide for boiling heat transfer. Different from this view, the discussion of recent results on pool boiling heat transfer of carbon dioxide in this review demonstrates that the high heat transfer coefficients measured for carbon dioxide in comparison to hydrocarbon or halocarbon refrigerants are mainly due to the fact that application of carbon dioxide is mostly envisaged for conditions where reduced saturation pressure is higher than for common refrigerants. In the first part of the review, the three main influences, by heat flux, saturation pressure and fluid properties, on pool boiling of carbon dioxide are discussed using recent measurements for CO2 by Kotthoff et al. and other organic substances. In the second part, a comparison is given with the few former data available and with new results of Loebl and Kraus on the influence of the heating wall (material and surface roughness). Finally, analogies between nucleate pool boiling and new flow boiling data are shown for those domains of flow boiling in which nucleation provides the dominant contribution to heat transfer and convective effects are of secondary importance.

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Pages: 1169-1185

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Details

  • Original title: Review on pool boiling heat transfer of carbon dioxide.
  • Record ID : 2006-0664
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 28 - n. 8
  • Publication date: 2005/12

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