Abstract
In this study, experiments were conducted in order to investigate the effect of noncondensable gas on the condensation heat transfer in a feed-water heater under the conditions of inlet quality 13-100% and inlet air molar fraction 0-1.2%. The thermal resistance on condensation surface was found to be proportional to the local air molar fraction. A transport equation of noncondensable gas and the experimental equation of thermal resistance on condensation surface were added to the previously developed program with a two-fluid model and condensation heat transfer model. Feed-water heater calculations indicated that the effect of noncondensable gas on the heat transfer was negligibly small under the operation conditions of about 30 ppm in a power plant. Keywords: Noncondensable Gas, Condensation Heat Transfer, Feed Water Heater
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