本研究之目的在於探討自然通風設計是否對防火安全造成影響。利用實尺寸實驗的方式來比較其自然通風流道的設置對煙層下降快慢的影響。並利用FDS模擬相同的場景，驗證FDS的準確性。
根據案例的分析，研擬出一座含三間房間的實驗空間，利用50千瓦的油盤產生濃煙，觀察煙層流動與下降情形，從實驗結果來推論自然通風流道的設置對煙流情勢的影響。
實驗結果發現，本研究的設計場景中，當火災發生在沒有自然通風流道的房間時，其火災室的煙層下降情勢與鄰室自然通風流道的設置較無關聯，而鄰室的煙層則因為自然通風流道的設置而延緩煙層下降時間；而當火災發生在設有自然通風流道的房間時，其自然通風流道可有效的延緩煙層下降速度，並提高煙層的平衡高度。當自然通風設計中包含外風直接貫流入室內時，外風會造成室內煙層的擾動，並抵抗煙氣的排放，使得煙氣在室內擴散的更快，造成逃生的危險。
FDS的模擬中，溫度曲線與實驗的溫度曲線大致上相同。利用FDS所算出來的煙層下降曲線，也與實驗所觀測之煙層位置符合。這說明了FDS在本次實驗中有相當良好的預測性。

The purpose of this research is to investigate influence of the natural ventilation design on fire safety. Change in descending rate of the smoke level with a vertical ventilated shaft is explored by full-scale experiments. FDS is also applied to simulate the same scenes and to verify the accuracy here.
A space with three rooms was built to analyze different cases. Small pool fire (~50kW) was lit up to generate smoke. The drop of smoke level and smoke flow pattern in different conditions were observed.
Results show that when fire occurred in the room without natural ventilation shaft (NV-shaft), the smoke descending rate is less related to NV-shaft within the next room. Smoke layer descending rate is hold by the ventilation of NV-shaft in the next room. When fire occurs in the room with NV-shaft, the smoke descending rate will be delayed; therefore the smoke level will be lifted. When the nature ventilation design contains a device to induce the wind to blow inside the room, the wind will disturb the smoke and keep smoke from emitting out. It will be dangerous because the smoke will diffuse faster.
The temperature curve simulated by FDS is nearly the same as experimental measurements. The smoke descending rate correlates well with the smoke layer height observed experimentally as well. It shows that FDS has good prediction on the smoke layer in this scenario.

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