Single-sided natural ventilation driven by wind pressure and temperature difference
Single-sided natural ventilation driven by wind pressure and temperature difference
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DOI：
10.1016/j.enbuild.2006.07.012
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发表时间：
2008-01-01
影响因子：
6.7
通讯作者：
Heiselberg, Per
中科院分区：
文献类型：
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作者：
Larsen, Tine S.;Heiselberg, Per
尽管打开窗户使房间通风似乎很简单，但在这种情况下发生的流动是相当复杂的。通过窗户开口的空气量将取决于建筑物附近的风速、房间内外的温度、风向、风中的湍流特性以及由例如阵风引起的压力变化。最后，它还取决于开口的大小、类型和位置。这些参数中有许多是不稳定的，这使得换气次数的计算更加复杂。本文进行了全尺寸风洞实验，目的是提出一种新的单侧自然通风风量计算公式。在风洞实验中发现，主导驱动力在风速和温差之间不同，这取决于力和风向之间的比率。这种变化也被发现在开口处测量的速度剖面中，其可能在相同风向下随着温差的增加而从风主导变为温度主导。(C)2007 Elsevier B.V.保留所有权利。
Even though opening a window for ventilation of a room seems very simple, the flow that occurs in this situation is rather complicated. The amount of air going through the window opening will depend on the wind speed near the building, the temperatures inside and outside the room, the wind direction, the turbulence characteristics in the wind and the pressure variations caused by e.g. wind gusts. Finally, it also depends on the size, type and location of the opening. Many of these parameters are unsteady which makes the calculation of air-change rates even more complicated. in this work, full-scale wind tunnel experiments have been made with the aim of making a new expression for calculation of the airflow rate in singlesided natural ventilation. During the wind tunnel experiments it was found that the dominating driving force differs between wind speed and temperature difference depending on the ratio between the forces and the wind direction. This change is also found in the velocity profiles measured in the opening, which might change from wind dominated to temperature dominated under the same wind direction but with increasing temperature difference. (C) 2007 Elsevier B.V. All rights reserved.