• Proceedings of the SAREK Conference
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• 2005.11a
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• pp.445-450
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• 2005

In this paper, the individual reentering rate of the cooling towers installed on a building roof is investigated considering the wind direction and louver wall installation. As the western wind with 5 m/s flows and the louver wall is not installed around the roof. the reentering rate of the cooling towers is predicted about 20%. However the reentering rate is simulated about 5% when the louver wall is installed around the roof. As the southern wind with 5 m/s flows and the louver wall is not installed, the reentering rate of the cooling tower is predicted about 30%.On the contrary, the reentering rate is simulated about 15% when the louver is installed. As a result, if there is no louver wall installed around the roof, the falloff of the cooling capacity would be serious by the reentering of the discharge air. The installation of the louver wall is strongly recommended to prevent the discharge air reentering.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.18 no.11
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• pp.923-932
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• 2006

In this paper, reentering ratio and cooling capacity of individual cooling towers arrayed on a building roof were studied by a numerical method. The number of 16 cooling towers were divided into 4 banks. It was considered the summer prevailing wind characteristics as west wind and south wind of 5 m/s. It was also considered the roofwall types as the curtainwall and the louverwall that had the outdoor air intake louver in the curtainwall. In this case, the louver was suggested as the solution that could prevent reentering phenomenon due to recirculation and interference of the discharge air. In the case of the curtainwall, the averaged reentering ratio are predicted 13.3% and 24.4% for the west and south wind of 5 m/s, respectively. In the case of the louverwall, the averaged reentering ratio are predicted 2.5% and 9.7% for the west and south wind of 5 m/s, respectively. Therefore, the louverwall is a appropriate solution for reducing the reentering phenomenon.