In large enclosures such as gymnasiums, it is difficult to control the air temperature and create a comfortableclimate for people with respect to the heating condition. There are two main reasons that the air temperature in anoccupied area is not increased efficiently in large enclosures. 1) Hot supplied air goes up and stays in the upperarea due to buoyancy and it takes long time to reach the lower occupied area. 2) The heat capacity of the buildingstructure affects the air temperature and cold air stays in the lower area.
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