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A generalized correlation for the characteristics of adiabatic capillary tubes.

Author(s) : YANG L., WANG W.

Type of article: Article, IJR article

Summary

The capillary tube is often served as an expansion device in small refrigeration and air-conditioning systems. In this paper, a generalized correlation for predicting the refrigerant mass flow rate through the adiabatic capillary tube is developed with approximate analytic solutions based on the extensive data for R-12, R-22, R-134a, R-290, R-600a, R-410A, R-407C, and R-404A, in which a homogeneous equilibrium model for two-phase flow is employed, and there is a subcooled liquid or saturated two-phase mixture at the inlet of the capillary tubes. The collected database about capillary tubes covers the inner diameter from 0.5 to 2 mm, the tube length from 0.5 to 5 m, the condensing temperature from 20 to 60°C, the subcooling from 0 to 20 °C, and the quality from 0 to 0.3 at the inlet. Assessments for the correlation are made with some experimental data for R-12, R-22, R-134a, R-290, R-407C, R-410A, and R-404A obtained from the open literature and some existing correlations based on the experimental database also. The present correlation yields an average deviation of -0.83% and a standard deviation of 9.02% from the database.

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Pages: 197-203

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Details

  • Original title: A generalized correlation for the characteristics of adiabatic capillary tubes.
  • Record ID : 2008-0610
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 31 - n. 2
  • Publication date: 2008/03

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