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ساختمان و محیط زیست
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • wind tunnel investigation of natural ventilation through multiple stacks. part 1: mean values

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    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 568
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
      wind tunnel experiments have been performed on a scale model to study unsteady natural ventilation through multiple stacks. a previously developed hot-wire technique was used to obtain both mean and instantaneous flow characteristics. the work is described in two parts. part 1 concentrates on the mean flows, since it is these that are usually used for design purposes. stacks are a potential means of ensuring that the required flow pattern is obtained over a range of conditions, so that flow direction (rather than just magnitude) is an important issue. two distinct ways in which a wind tunnel can be used for design are considered. the first is to measure surface wind pressures, from which flow directions can be inferred or calculated. the second way is to carry out direct measurements of the stack flows (magnitude and direction). both of these ways are examined using the measured data and their advantages and disadvantages are discussed. the accuracy of the hot-wire technique was examined on the basis of the mass balance when only stacks are present. the effects of reynolds number and wind direction on flows and pressures are presented. an investigation of the effect of opening configuration on wind pressure coefficients surprisingly revealed that in some cases the coefficients were affected. the effect of external flow on the discharge coefficients of the stacks was found to be consistent with earlier results on single stacks. there is evidence that the effect on the orifice coefficients is more important for envelope flow modeling.

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