More than 15 years have already passed since the provisions concerning the equipments for smoke exhaustion were included into the Building Standard Law of Japan, and now the words "smoke exhaustion" are very familiar to those concerned with buildings in some way, such as designers, owners, managers and building officials. However, not many experiments have been conducted by now to examine the efficiencies of the smoke exhaustion systems installed to actual buildings, although this is quite understandable considering the various troubles associated with running fire experiments in the buildings in normal use.
On the other hand, in the International Exposition '85 held in Tsukuba, a number of pavilions were built with the smoke exhaustion systems of many types. And since those pavilions were all temporary, we could have a chance to carry out the experiments using several of them to study the smoke behaviors and the efficiencies of the smoke exhaustion systems after the exposition was over.
This paper reports the results of the experiment carried out in one of the pavilions. In this experiment, smoke filling behaviors in a space with a simple geometry and a large space capacity were investigated varying the size of fire source. The results of this experiment will be valuable as a data base for further in-depth studies on the behavior of smoke in buildings since this kind of field tests are rare. Also, it was found that the smoke filling speed in this pavilion can be predicted remarkably well with a simplified model which has been already proposed.
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