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The main disadvantage of natural draft dry cooling towers is the influence of atmospheric conditions as ambient temperature and wind speed on the thermal performance. Wind disrupts the natural flow of air inside the tower creating vortices at the back and inside the tower that disrupts the air flow structure. When the wind blows, increasing the velocity of inlet air through the front louvers causes the air to pass through the behind louvers rather than outlet opening. The negative effect of this phenomenon reduces the cooling performance and consequently reduces the turbine production power in power plants. A good solution to this problem is to adjust the Louvers angle correctly. Therefore, in the present study, the thermal performance of the dry cooling tower was evaluated under the conditions of opening and closing the front louvers and changing their angle. In this regard, a natural draft dry cooling tower unit with the dimensions of the cooling tower located in combined cycle power plant was simulated in 3D using fluent software and the numerical results with the experimental data have been validated. The Realizable k-ε turbulent model is used to model the turbulent flow and the performance of the tower has been studied in three modes, including no wind, with the wind and the fully open louvers and with the wind and the semi-open louvers. According to the results, by partially removing the louvers to 60°, the heat transfer can be increased to 16% and the mass flow rate to 15%.
 

Keywords: Dry cooling tower, Numerical simulation, Heat transfer, Louver, Wind

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