Abstract
Sprinklers systems are extensively applied as suppression tools in buildings, however it is necessary to determine the smoke behavior affected by sprinkler sprays during initial stage of fire. In the previous papers, the full-scale experimental studies were carried out to measure the downward smoke flow rate which penetrates a boundary surface between lower and upper layers by the drag effects of sprinkler spray. And a mathematical model was developed for predicting it. In this paper, a fire model based on two layer zone concept which includes the mathematical model is developed. Additionally, the cooling effect by heat transfer from the hot smoke layer to sprinkler water spray is also considered in the fire model. The predictions of the fire model such as the temperature, CO2 concentration profile of the upper and lower layers and the smoke layer height agree well with the experimental measurements which were carried out in previous papers.
