大多數的地下停車場、地下建築物換氣量不足，往往需要使用通風機械來增加換氣率，以排除場內車輛所排出之廢氣和廢熱，然而通風機械會耗費電力能源。若建築師在設計地下停車場時，可以有效地設計停車場對外的通風口，讓地下室採用自然通風的方式來更新室內空 氣以及自然採光，將可節約大量的電力能源。本研究便是利用風洞實驗、 計算流體力學數值模式 和時間尺度分析探討 自然通風 對於 地下停車場中一氧化碳 污染物 傳輸 的影響 提出計算地下建築物自然通風量的計算方法以及設計通風豎井 、捕風器 之通則， 並 找 出有利於地下停車場採用 自然通風 之最佳 設計，以供建築師設計地下停車場 之參考 。模擬流況以貫流通風為主 ，研究成果顯示當 地下停車場有斜坡車道 以及 通風豎井， 其 通風量最大 建築物內部的 一氧化碳濃度 消散 最 快 其次為 地下 建築物設置捕風器 和 通風豎井 隨著通風豎井數量增加，通風量隨之增加； 反之，當建築物 沒有捕風器， 只設置 垂直地面的 通風豎井， 自然 通風量最低，一氧化碳濃度消散 最 慢 。 地面的建築物可增加地下室的自然通風量，且 當 捕風器和 通風豎井的斷 面積愈大，通風量 會 隨之增加 ，同樣地，也 增加 污 染物濃度 的消散速 率 。

Most underground parking lots use mechanical ventilation facilities to remove the excessive heat and indoor contaminants while consuming large amounts of electric energy. On the other hand, if the underground car parks are appropriately incorporated natural ventilation into their design, the architect can reduce the energy consumption of the building. This study uses to wind tunnel experiments, a CFD model and time scale analysis to investigate the natural ventilation and concentration field of carbon monoxide in underground garages. The simulation results demonstrate that the underground garage has the highest ventilation rate and the fastest decay rate of carbon monoxide when the garage has a ramp driveway with a ventilation shaft. Alternatively, the ventilation rate is somewhat smaller for underground garages with wind catchers and a ventilation shaft. The ventilation rate is the lowest and decay rate of CO concentration is the smallest when the garage only has vertical ventilation shafts. The ventilation rate will increase when there is a building on the ground. The results of this study can be used to predict the natural ventilation rates of underground garages.

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