Wind-induced pressure distribution on a large grain storage shed: Prediction of wind-driven ventilation rates

Abstract The wind-induced pressure distribution over a typical, large grain storage shed (rectangular low rise building, 30° pitched roof) is presented for different wind orientations. The distribution was determined from a wind tunnel model study using a simulated atmospheric boundary layer. The overall pattern was similar to that expected, showing, in particular, a prominent leeward vortex for some wind incidence angles. As an example of the use of the pressure distribution data in ventilation modelling and design studies, the ventilation rate was calculated for three different dispositions of vent in the storage. Two of these incorporated rectangular vents in the roof; the third being the common open eave vent system. The three dispositions investigated gave similar calculated ventilation rates showing that, for an equal area of vent, the open eave system could be replaced by suitably placed and more easily sealed rectangular vents.

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