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在对地板到顶棚有一定高度的空间进行采暖时,空气要发生上升作用。因为热空气的密度比冷空气的密度低,所以无论采用那种方法采暖,热空气都有朝顶棚上升的倾向,特别是热空气从地板吹出时更是如此。这种作用普遍存在于建筑物中,尤其当地板到顶棚之间具有可观高度时,如教堂、体育馆、剧院、音乐厅以及大多数工厂和车间等,其顶棚的空气温度可达40℃或更高,而地板空气的温度仅为18℃或更低,上下温度相差很大。由此带来的明显缺陷:
In the heating of floors with a certain height from the floor to the ceiling, air will rise. Because the density of hot air is lower than that of cold air, hot air tends to rise toward the ceiling no matter what kind of heating method is used, especially when hot air blows from the floor. This effect is ubiquitous in buildings, especially when there are considerable heights from the floor to the ceiling, such as churches, stadiums, theaters, concert halls, and most factories and workshops. The ceiling air temperature can reach 40°C or more. High, while the temperature of the floor air is only 18°C or lower, the temperature difference between upper and lower temperatures is very large. Obvious defects resulting from this: