本研究主要針對防火上經常使用的密閉式自動撒水頭，在各種不同火源位置下進行實驗，並分析影響撒水頭作動的因素。同時使用FDS進行模擬，並與實驗結果進行比較。
在本研究中，火源位置可大致分為火源未靠近任何壁面、火源位於壁面以及火源位於房間角落。實驗中發現火源在靠近壁面時，火焰高度會比較高，也因此加速煙氣的上升，使撒水頭作動時間較快。牆壁對於火源的影響可稱為壁面效應，角落的影響可稱為角落效應，而角落效應對於火場的影響會比壁面效應更大，也因此當火源位於房間角落時的撒水頭作動時間最短。
比較FDS模擬值與實驗值後發現，兩者之間的溫度值偏差過大，經由熱電偶靈敏度實驗的結果發現在撒水頭作動時，實驗屋所量得的溫度，會與實際火場溫度大約低30~40℃。
若摒除熱電偶靈敏度的影響，整體而言FDS對此實驗所進行的模擬相當準確，而且溫度的分布趨勢也與實驗大致一樣。

With regard to the activation of the automatic fire sprinklers, a series of room-fire tests were carried out by means of gas burner.
The gas burner was placed in three different locations. When the burner was placed against the wall, the height of flame was higher and the movement of smoke was faster, and activation time was reduced. The effect of corner was greater than the effect of wall, so the activation time was the shortest when burner was at the corner. The activation time was longest when the gas burner was placed in the middle of the room. At the same time, all geometries were modeled using the computational fluid dynamics fire model, Fire Dynamics Simulator (FDS), for comparing numerically predicted results with the test data obtained.
The comparison between the experimental and predicted data has shown that the deviation of temperature was too high, and the reason was found to be the sensitivity of the thermalcouples, according to the result of the sensitivity tests of the thermalcouples the measured temperature differed from the actual environment temperature about 30~40℃.
In conclusion, the FDS has predicted, with good accuracy, the temperature history and the activation trend of the sprinklers.

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