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R404A condensing under forced flow conditions inside smooth, microfin and cross-hatched horizontal tubes.

Author(s) : INFANTE FERREIRA C. A., NAN X., NEWELL T. A., et al.

Summary

Experimental parameters include a lubricating polyol ester oil concentration varied from 0 to 4%. The test runs were done at average inlet saturated condensing temperatures of 40 °C. The inlet vapour was kept at saturation (quality= 1.0). The mass fluxes were between 200 and 600 kg/m2s, and the heat fluxes, selected to obtain a quality of 0.0 at the outlet of the test section, varied from 5 to 45 W/m2. The heat transfer enhancement factor varied between 1.8 and 2.4 for both microfin and cross-hatched tubes. Enhancement factors increased as oil concentrations increased up to 2%. For higher oil concentrations, the enhancement decreased. Pressure drop in the test section increased by approximately 25% as the oil concentration increased from 0 to 4%. The results from the experiments are compared with those calculated from correlations reported in the literature. Modified correlations are proposed.

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Pages: 2001-5

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Details

  • Original title: R404A condensing under forced flow conditions inside smooth, microfin and cross-hatched horizontal tubes.
  • Record ID : 2003-0674
  • Languages: English
  • Source: Thermophysical Properties and Transfer Processes of New Refrigerants.
  • Publication date: 2001/10/03

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