Modeling of high pressure steam condensation in the presence of a noncondensable gas in a vertical tube with a secondary pool condition

An improved theoretical model was developed to investigate the effects of noncondensable gas on the heat transfer coefficient of steam condensing inside a vertical tube using the heat and mass transfer analogy with a secondary pool condition. The model predicted well the experimental data of Oh and Rebankar (2006) and Kim (2000), which had been obtained from the in-tube steam condensation submerged in water pool with air. A parametric study was performed with the system pressure and condenser tube diameter as parameters. Results show that total and overall heat transfer coefficients decreased as the system pressure and the condenser tube diameter increased in low pressure, but they became saturated in high pressure. (authors)