Condensation of steam with high CO2 concentration on a vertical plate

• Investigation of steam condensation with high fractional CO2.
• Relevant parameters such as gas/liquid film resistance are calculated to explain the experimental results.
• The new correlation can improve prediction uncertainty less than ±20%.

The effect of a non-condensable gas on steam condensation has been studied. From experimental and theoretical studies to date, clear evidence of significant heat transfer deterioration by the non-condensable gas can be seen. The deterioration varies with the concentration of the non-condensable gas, geometric parameters, system pressure, etc. However, these data and correlations may be unreliable due to the high concentration of CO2 in the vapor mixture and lack of verification through experiments. In this paper, a systematic investigation has been conducted for film-wise condensation using a vapor mixture of steam and a high concentration of CO2. Some data were obtained on a vertical plate, with the average vapor velocity of 1.2 m/s, CO2 mass fraction of 20%—94% and a pressure of 1 atm. The effects of CO2 concentration and surface sub-cooling on heat transfer characteristics have been investigated. Moreover, the relevant parameters such as gas/liquid film resistance were included in the description of the condensation phenomenon. The developed correlation for steam and a high concentration of CO2, based on experimental results, has a standard deviation of less than ±20%.