Comparison of heat transfer coefficients for condensation of CFC-11 and HCFC-123 on an in-line bundle of horizontal finned tubes

Hiroshi Honda, Hiroshi Takamatsu, Kyoohee Kim, Hiroshi Urakami, Nobuo Takada

Research output: Contribution to journalArticle

Abstract

This paper presents a comparison of measured condensation heat transfer coefficients for refrigerant CFC-11 and its proposed replacement HCFC-123 flowing down a 3×15 (columns×rows) in-line bundle of horizontal finned tubes. The vapor velocity at the tube bundle inlet (based on minimum flow cross section) ranged from 0.9 to 10 m/s, and the condensation temperature difference from 1.3 to 19 K. Heat transfer measurements were made on a row-by-row basis. Generally, the heat transfer coefficient for HCFC-123 was about 10% lower than that for CFC-11. The heat transfer enhancement due to vapor shear was much smaller than that in the case of a smooth tube bundle. At a high vapor velocity, the enhancement was most significant for the top row and decreased sharply with increasing row number. The decrease in the heat transfer coefficient due to condensate inundation was also much smaller for the finned tube bundle. The measured heat transfer coefficient for the smallest vapor velocity agreed well with the theoretical prediction for a stagnant vapor.

Original languageEnglish
Pages (from-to)244-249
Number of pages6
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume59
Issue number561
Publication statusPublished - May 1993

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chlorofluorocarbons
Chlorofluorocarbons
heat transfer coefficients
Heat transfer coefficients
bundles
Condensation
condensation
Vapors
vapors
tubes
heat transfer
Heat transfer
augmentation
refrigerants
Refrigerants
condensates
temperature gradients
shear
cross sections
predictions

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

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title = "Comparison of heat transfer coefficients for condensation of CFC-11 and HCFC-123 on an in-line bundle of horizontal finned tubes",
abstract = "This paper presents a comparison of measured condensation heat transfer coefficients for refrigerant CFC-11 and its proposed replacement HCFC-123 flowing down a 3×15 (columns×rows) in-line bundle of horizontal finned tubes. The vapor velocity at the tube bundle inlet (based on minimum flow cross section) ranged from 0.9 to 10 m/s, and the condensation temperature difference from 1.3 to 19 K. Heat transfer measurements were made on a row-by-row basis. Generally, the heat transfer coefficient for HCFC-123 was about 10{\%} lower than that for CFC-11. The heat transfer enhancement due to vapor shear was much smaller than that in the case of a smooth tube bundle. At a high vapor velocity, the enhancement was most significant for the top row and decreased sharply with increasing row number. The decrease in the heat transfer coefficient due to condensate inundation was also much smaller for the finned tube bundle. The measured heat transfer coefficient for the smallest vapor velocity agreed well with the theoretical prediction for a stagnant vapor.",
author = "Hiroshi Honda and Hiroshi Takamatsu and Kyoohee Kim and Hiroshi Urakami and Nobuo Takada",
year = "1993",
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TY - JOUR

T1 - Comparison of heat transfer coefficients for condensation of CFC-11 and HCFC-123 on an in-line bundle of horizontal finned tubes

AU - Honda, Hiroshi

AU - Takamatsu, Hiroshi

AU - Kim, Kyoohee

AU - Urakami, Hiroshi

AU - Takada, Nobuo

PY - 1993/5

Y1 - 1993/5

N2 - This paper presents a comparison of measured condensation heat transfer coefficients for refrigerant CFC-11 and its proposed replacement HCFC-123 flowing down a 3×15 (columns×rows) in-line bundle of horizontal finned tubes. The vapor velocity at the tube bundle inlet (based on minimum flow cross section) ranged from 0.9 to 10 m/s, and the condensation temperature difference from 1.3 to 19 K. Heat transfer measurements were made on a row-by-row basis. Generally, the heat transfer coefficient for HCFC-123 was about 10% lower than that for CFC-11. The heat transfer enhancement due to vapor shear was much smaller than that in the case of a smooth tube bundle. At a high vapor velocity, the enhancement was most significant for the top row and decreased sharply with increasing row number. The decrease in the heat transfer coefficient due to condensate inundation was also much smaller for the finned tube bundle. The measured heat transfer coefficient for the smallest vapor velocity agreed well with the theoretical prediction for a stagnant vapor.

AB - This paper presents a comparison of measured condensation heat transfer coefficients for refrigerant CFC-11 and its proposed replacement HCFC-123 flowing down a 3×15 (columns×rows) in-line bundle of horizontal finned tubes. The vapor velocity at the tube bundle inlet (based on minimum flow cross section) ranged from 0.9 to 10 m/s, and the condensation temperature difference from 1.3 to 19 K. Heat transfer measurements were made on a row-by-row basis. Generally, the heat transfer coefficient for HCFC-123 was about 10% lower than that for CFC-11. The heat transfer enhancement due to vapor shear was much smaller than that in the case of a smooth tube bundle. At a high vapor velocity, the enhancement was most significant for the top row and decreased sharply with increasing row number. The decrease in the heat transfer coefficient due to condensate inundation was also much smaller for the finned tube bundle. The measured heat transfer coefficient for the smallest vapor velocity agreed well with the theoretical prediction for a stagnant vapor.

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