Analysis of experiments for the effect of noncondensable gases on steam condensation over a vertical tube external surface under low wall subcooling

Su, Jian; Sun, Zhongning; Ding, Ming; Fan, Guangming

doi:10.1016/j.nucengdes.2014.07.022

Cited by 68 publications

(16 citation statements)

References 11 publications

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“…In reference to [7,9,10], it is assumed that the relationship between the wall subcooling temperature and the condensation heat transfer coefficient is exponential, and the effect of pressure and air mass fraction is considered ，which have…”

Section: Fitting Correlationmentioning

confidence: 99%

“…The empirical formula was obtained by multiple linear regression, but the trend of effect of wall subcooling temperature on the condensation heat transfer coefficient was opposite to that of Dehbi. Su [6,7] studied the influence of various parameters on condensation heat transfer under high pressure and large wall subcooling temperature conditions. The results correlated by an empirical formulation, which the influence of various parameters on the condensation heat transfer could be well reflected.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, deviations also existed in the same experimental conditions for different correlations. Figure 2 shows the deviation of the heat transfer coefficient calculated by Su's [7] and Dehbi's [4] correlation. The results showed that the difference of the two correlations reached 25%-40% under the condition of 30 °C of the wall subcooling temperature with different air mass fraction.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Investigation on Condensation of Vapor in the Presence of Non-Condensable Gas on a Vertical Tube

Zhang¹,

Shen²,

Cheng³

et al. 2018

Preprint

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According to the operation conditions of time unlimited passive containment heat removal system (TUPAC), a separate effect experiment facility was established to investigate the heat transfer performance of steam condensation in presence of non-condensable gas. The effect of wall subcooling temperature, total pressure and mass fraction of the air on heat transfer process was analyzed. The heat transfer model was also developed. The results showed that the heat transfer coefficient decreased with the rising of subcooling temperature, the decreasing of the total pressure and air mass fraction. It was revealed that Dehbi’s correlation predicted the heat transfer coefficient conservatively, especially in the low pressure and low temperature region. The novel correlation was fitted by the data obtained in the following range: 0.20~0.45 MPa in pressure, 20% ~ 80% in mass fraction, 15°C ~ 45°C in temperature. The discrepancy of the correlation and experiment data was with ±20%.

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Section: Fitting Correlationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Investigation on Condensation of Vapor in the Presence of Non-Condensable Gas on a Vertical Tube

Zhang¹,

Shen²,

Cheng³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…This article primarily focuses on an integrated test bench simulation of a single natural circulation loop. For a single natural circulation loop, the heat transfer coefficient is determined by the degree of surface undercooling [1,2]; then, the accuracy of the heat transfer coefficient is verified by comparing the calculated degree of undercooling with the input conditions. Next, the circulating flow rate is calculated to determine the test circuit boundary conditions, using a single natural circulation test circuit as the foundation.…”

Section: Introductionmentioning

confidence: 99%

Simulation analysis of a passive containment cooling system based on the RELAP5 program

Fei¹,

Zhang²,

Shen³

et al. 2019

IJSGCE

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Based on previous proposals for a new type of nuclear power plant with passive containment heat transfer following an accident, this work utilizes the RELAP5 program to establish a thermal hydraulic model test system. Focusing on a test circuit with a single natural circulation loop, a parameter sensitivity analysis was performed by changing parameters, such as ambient pressure, ambient temperature, and degree of surface undercooling, and the design boundary conditions for a single natural circulation test circuit were obtained. Employing a comprehensive natural circulation test circuit, the heat transfer capability of the air-cooling system of the integrated test system was evaluated by assuming parameters such as the cold source ambient temperature, providing an important reference for the design of the main equipment.

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“…Thus, the heat removal rate of the condenser tubes in the PCCS is dominated by steam condensation in the presence of a noncondensable gas under natural convection conditions. With regard to the regard to the containment cooling, many researchers have investigated the steam condensation in the presence of a noncondensable gas [2][3][4][5][6][7][8][9][10][11][12][13]. Depending on the design criteria of the PCCS, a vast heat transfer area may be required for the decay heat removal.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Condensation Heat Transfer Rate of the Air-Steam Mixture on a Passive Condenser System Using Annular Fins

et al. 2017

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This paper presents an experimental investigation on the enhancement of the heat transfer rate of steam condensation on the external surfaces of a vertical tube with annular fins. A cylindrical condenser tube, which is 40 mm in outer diameter and 1000 mm in length, with annular disks of uniform cross-sectional area is fabricated in the manner of ensuring perfect contact between the base surface and fins. A total of 13 annular fins of 80 mm diameter were installed along the tube height in order to increase the effective heat transfer area by 85%. Through a series of condensation tests for the air-steam mixture under natural convection conditions, the heat transfer data was measured in the pressure range of between 2 and 5 bar, and the air mass fraction from 0.3 to 0.7. The rates of heat transfer of the finned tube are compared to those that are measured on a bare tube to demonstrate the enhanced performance by extended surfaces. In addition, based on the experimental results and the characteristics of steam condensation, the applicability of finned tubes to a large condenser system with a bundle layout is evaluated.

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Analysis of experiments for the effect of noncondensable gases on steam condensation over a vertical tube external surface under low wall subcooling

Cited by 68 publications

References 11 publications

Experimental Investigation on Condensation of Vapor in the Presence of Non-Condensable Gas on a Vertical Tube

Experimental Investigation on Condensation of Vapor in the Presence of Non-Condensable Gas on a Vertical Tube

Simulation analysis of a passive containment cooling system based on the RELAP5 program

Enhancement of Condensation Heat Transfer Rate of the Air-Steam Mixture on a Passive Condenser System Using Annular Fins

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