Experiment Investigation Of Condensation In Corrugated Low Finned Tubes

The experimental study of steam and mixed vapor with high ratio non-condensable gas condensation inside horizon corrugated low finned tubes was carried out in this thesis. The effects of structural parameters of corrugated low finned tubes, steam pressure and non-condensable gas ratio on condensation heat transfer were studied. According to the results of experiments, the corrugated low finned tubes can effectively strengthen the in-side tube condensation heat transfer. The in-side tube heat transfer coefficient can be enhanced to a maximum of1.9times within the experimental range. The threaded height of corrugated low finned tubes has significant influence on the condensation heat transfer, the greater the thread height, the more effective the strengthening effect. The pressure of vapor inside tubes has influence on the condensation heat transfer, the greater the pressure, the more effective the strengthening effect. Non-condensable gas has a significant impact on condensation heat transfer. When the Reynolds number of steam is100000and the proportion of non-condensable gases in mixed vapor is40%, the in-tube condensation heat transfer coefficient decreased by approximately80%. With the increase of the steam flow rate, the non-condensable gas has weak influence on the in-tube condensation heat transfer coefficient. The calculation and comparative investigation of highly efficient condenser with titanium corrugated low finned tubes are introduced. According to the calculated results, the heat transfer area of highly efficient condenser is reduced by about31.58%compared with ordinary condenser. The condenser with corrugated low finned tubes can significantly reduce the heat transfer area and the use amount of titanium, strengthen the condensation and achieve the purpose of energy saving.