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Local bundle boiling heat transfer coefficients on a Turbo-BII HP tube bundle (RP-1089).

Author(s) : ROBINSON D. M., THOME J. R.

Type of article: Article

Summary

Experiments have been performed for evaporation of refrigerants R134a, 410A, and R507A on the outside of a horizontal bundle composed of enhanced boiling Turbo-BII HP tubes. Hot water flowing through the tubes was used as the heat source. Water temperature measurements were made at numerous axial locations within the tubes to obtain the water's temperature profile and, thus, measure twelve local heat transfer coefficients in the bundle. Pool boiling tests to measure the corresponding nucleate boiling curves were also obtained. Test were conducted with a 20-tube bundle over ranges of heat flux, mass flux, and vapour quality. The bundle test results showed a significant contribution of convection from rising bundles to the heat transfer process with local heat transfer coefficients as large as 1.6 times those of nucleate pool boiling in the case of R134a. Refrigerants R507 and R410A also showed bundle enhancement effects but less so than R134a.

Details

  • Original title: Local bundle boiling heat transfer coefficients on a Turbo-BII HP tube bundle (RP-1089).
  • Record ID : 2005-2478
  • Languages: English
  • Source: HVAC&R Research - vol. 10 - n. 4
  • Publication date: 2004/10

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