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Natural ventilation of a room with vents at multiple levels

机译：房间有多个通风口的自然通风

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The natural ventilation of a room with a source of heating at the base and with vents at multiple heights is investigated both theoretically and experimentally. The key to the analysis is determination of the position of neutral buoyancy, where the pressure in the room equals that in the exterior. Air flows in through vents below the position of neutral buoyancy and exits from vents above it. When a room is heated by a distributed source the room heats up to a uniform state and the position of neutral buoyancy depends solely on the ratio of the upper and lower vent areas. When a room is heated by a point source or series of point sources, a vertically stratified environment develops and the neutral buoyancy surface is higher. Depending on the nature of the heat source, the mixing of air flowing in through an intermediate opening leads to different types of stratification in the interior. For a distributed heat source, the interior remains well mixed whereas for a point source, a two-layer stratification develops. The flow produced by both distributed and point sources of heating are compared; the point source leads to a lower ventilation flow, although in both cases the ventilation flow can be raised by increasing the heat flux, the separation of the upper and lower vents, the total vent area or the distance of the intermediate level vents from the height of neutral buoyancy.
机译：在理论上和实验上都研究了房间的自然通风情况，该房间的底部为加热源，通风口为多个高度。分析的关键是确定中性浮力的位置，其中室内的压力等于外部的压力。空气从中性浮力位置下方的通风孔流入，并从上方的通风孔流出。当房间由分布式电源加热时，房间会加热到均匀状态，中性浮力的位置仅取决于上下通风口面积的比率。当一个点源或一系列点源对房间进行加热时，会形成垂直分层的环境，并且中性浮力面会更高。取决于热源的性质，通过中间开口流入的空气的混合会导致内部的不同类型的分层。对于分布式热源，内部保持充分混合，而对于点热源，会形成两层分层。比较了分布式和点热源产生的流量；点源导致较低的通风量，尽管在两种情况下都可以通过增加热通量，上下通风口的间距，总通风口面积或中间水平通风口与高度的距离来提高通风量中性浮力。

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