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Generalized method of pressure drop and tube, length calculation with boiling and condensing refrigerants within the entire zone of saturation.

Author(s) : PALIWODA A.

Type of article: Article, IJR article

Summary

A simple and universal method of pressure drop and horizontal tube length calculation with boiling and condensing refrigerants within the entire saturation zone ranging from critical point down to the lowest temperatures, is proposed. The method can be applied for the calculation of evaporators and condensers operating in conventional and non-conventional refrigeration, air conditioning and heat pump systems, as well as in similar cases. By introducing a two-phase flow factor, fl, and a liquid/vapour gradient ratio, 0, the correlation given by Miiller-Steinhagen and Heck can be rearranged to a simple dimensionless form which leads to a family of universal curves that enable any dry-saturated vapour flow gradient to be transformed into an actual two-phase flow gradient, or vice versa, at any temperature and liquid/vapour mixture quality within the entire saturation zone of refrigerants. Determination of 0 is a key factor in the accuracy of the calculation. Appropriate correlations and diagrams for predicting 0 are presented in terms of corresponding states principle. Some practical advice and numerical examples of evaporators and condensers calculation are given.

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Pages: 314-322

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Details

  • Original title: Generalized method of pressure drop and tube, length calculation with boiling and condensing refrigerants within the entire zone of saturation.
  • Record ID : 30001725
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 12 - n. 6
  • Publication date: 1989/11

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