Study on condensation heat transfer under high-temperature, high-pressure conditions

H. Yuasa, N. Abe, H. Ono, K. Shirakawa, Shinichi Morooka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Knowing the predietcd overpressure rate under antieipated operational oeeurrcnecs (AOOs) is very important when evaluating the integrity of a BWR reactor pressure vessel. One of the factors that influence the overpressure rate is the wall condensing performance. Many condensing studies have been done under low-pressure conditions without vapor flow, but few condensing test results under BWR conditions have been reported. Therefore, the purposes of this study were to extend the vapor condensing data base for high-pressure, high-temperature conditions, to improve the heat transfer correlation and to evaluate the condensing effect on the overpressure rate. Condensation heat transfer tests have been performed with the pressure range from 0.5 to 8 MPa under upward and downward vapor flow. The test section consisted of a condensing tube and a water-cooling jacket. The condensing tube was a circular tube. The test results showed that the condensation heat transfer coefficient increased with the velocity of vapor flow due to enhancement of heat transfer caused by turbulence of the liquid film. We obtained a new correlation for condensation heat transfer that considered vapor shear force and condensate film Reynolds number. This new correlation agreed well with experimental data over a wide range of pressure. New correlation was incorporated into TRACG02modTI code. When the condensation heat transfer tests were analyzed using this modified TRACG02modTl code, the calculated condensation heat transfer coefficients were found to be in considerable agreement with the measured data. Furthermore, when ihe main steam isolation valve AOO (safety relief valve capacity design) of the BWR plant was evaluated by this modified TRACG02modTI code, we found that the vapor condensation effect appeared under relatively high-pressure conditions and the pressure with improved condensation model was lower than that without vapor condensation. In summary, the condensation heat transfer model of TRACG02modTI code has been improved based on high-pressure, high-temperature condensation test data with vapor flow. The vapor condensation effect was found to be strong, especially in the pressure increase AOO of the actual plant.

Original languageEnglish
Title of host publicationInternational Conference on Nuclear Engineering, Proceedings, ICONE
Pages75-80
Number of pages6
Volume3
DOIs
Publication statusPublished - 2008
Externally publishedYes
Event16th International Conference on Nuclear Engineering, ICONE16 2008 - Orlando, FL
Duration: 2008 May 112008 May 15

Other

Other16th International Conference on Nuclear Engineering, ICONE16 2008
CityOrlando, FL
Period08/5/1108/5/15

Fingerprint

Condensation
Heat transfer
Vapors
Temperature
Heat transfer coefficients
Safety valves
Pressure relief valves
Boiling water reactors
Liquid films
Cooling water
Pressure vessels
Reynolds number
Turbulence
Steam

Keywords

  • BWR
  • Condensation heat transfer
  • Thermal hydraulic

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

Cite this

Yuasa, H., Abe, N., Ono, H., Shirakawa, K., & Morooka, S. (2008). Study on condensation heat transfer under high-temperature, high-pressure conditions. In International Conference on Nuclear Engineering, Proceedings, ICONE (Vol. 3, pp. 75-80) https://doi.org/10.1115/ICONE16-48083

Study on condensation heat transfer under high-temperature, high-pressure conditions. / Yuasa, H.; Abe, N.; Ono, H.; Shirakawa, K.; Morooka, Shinichi.

International Conference on Nuclear Engineering, Proceedings, ICONE. Vol. 3 2008. p. 75-80.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Yuasa, H, Abe, N, Ono, H, Shirakawa, K & Morooka, S 2008, Study on condensation heat transfer under high-temperature, high-pressure conditions. in International Conference on Nuclear Engineering, Proceedings, ICONE. vol. 3, pp. 75-80, 16th International Conference on Nuclear Engineering, ICONE16 2008, Orlando, FL, 08/5/11. https://doi.org/10.1115/ICONE16-48083
Yuasa H, Abe N, Ono H, Shirakawa K, Morooka S. Study on condensation heat transfer under high-temperature, high-pressure conditions. In International Conference on Nuclear Engineering, Proceedings, ICONE. Vol. 3. 2008. p. 75-80 https://doi.org/10.1115/ICONE16-48083
Yuasa, H. ; Abe, N. ; Ono, H. ; Shirakawa, K. ; Morooka, Shinichi. / Study on condensation heat transfer under high-temperature, high-pressure conditions. International Conference on Nuclear Engineering, Proceedings, ICONE. Vol. 3 2008. pp. 75-80
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AB - Knowing the predietcd overpressure rate under antieipated operational oeeurrcnecs (AOOs) is very important when evaluating the integrity of a BWR reactor pressure vessel. One of the factors that influence the overpressure rate is the wall condensing performance. Many condensing studies have been done under low-pressure conditions without vapor flow, but few condensing test results under BWR conditions have been reported. Therefore, the purposes of this study were to extend the vapor condensing data base for high-pressure, high-temperature conditions, to improve the heat transfer correlation and to evaluate the condensing effect on the overpressure rate. Condensation heat transfer tests have been performed with the pressure range from 0.5 to 8 MPa under upward and downward vapor flow. The test section consisted of a condensing tube and a water-cooling jacket. The condensing tube was a circular tube. The test results showed that the condensation heat transfer coefficient increased with the velocity of vapor flow due to enhancement of heat transfer caused by turbulence of the liquid film. We obtained a new correlation for condensation heat transfer that considered vapor shear force and condensate film Reynolds number. This new correlation agreed well with experimental data over a wide range of pressure. New correlation was incorporated into TRACG02modTI code. When the condensation heat transfer tests were analyzed using this modified TRACG02modTl code, the calculated condensation heat transfer coefficients were found to be in considerable agreement with the measured data. Furthermore, when ihe main steam isolation valve AOO (safety relief valve capacity design) of the BWR plant was evaluated by this modified TRACG02modTI code, we found that the vapor condensation effect appeared under relatively high-pressure conditions and the pressure with improved condensation model was lower than that without vapor condensation. In summary, the condensation heat transfer model of TRACG02modTI code has been improved based on high-pressure, high-temperature condensation test data with vapor flow. The vapor condensation effect was found to be strong, especially in the pressure increase AOO of the actual plant.

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