本研究針對國內校園中常見的老舊大型講廳（可容納百人以上）進行調查，並針對某間具有高度差的典型階梯型講廳進行換氣配置的調整，並比較不同換氣配置下的換氣效益。改善後的系統保留了風量約為1700（m3/h）的舊有機械風機及增設兩台風量分別為2000（m3/h）及1000（m3/h）的機械風機，使室內通風換氣量達至約4700（m3/h）以符合各國規範及標準，在高彈性的換氣使用下，可因應在不同氣候、使用人數及需求調變使用，並在控制室內二氧化碳濃度的同時達到節能的效果。
為了具體測得並分析換氣效益的差異性，本研究透過濃度衰減法現場實測及CFD模擬作為研究方法，結果顯示，不同換氣配置影響實際換氣效率，換氣效益落差最大達至40% 以上。本研究之重點結論如下：1.較密閉的室內環境明顯不利於換氣，關閉自然開口使ACH從衰減了2.36% 至最大衰減了30.71%。 2.在高位配置機械換氣時，以第二類換氣（正壓）方式較佳，在低位配置低位配置機械換氣時，以第三類換氣（負壓）方式較佳。 3. CO2 濃度的沉澱間接影響換氣效益，在相對密閉狀態時，沉澱於低位的CO2 濃度最高達10000 ppm以上。4.風管的高度與出風角度對換氣效率有一定影響，風口面依照空間高程斜率設計俯仰角，能有較好的氣流路徑模式。

This study adjusts the ventilation configuration for a tiered lecture hall with varying elevations, comparing the ventilation effectiveness under different setups. The modified system achieves a ventilation rate of approximately 4700CMH to comply with international standards. With a highly flexible ventilation configuration, it can adapt to diverse climates, number of users and needs while controlling indoor CO2 concentration and promoting energy efficiency.
Through on-site testing using the concentration-decay method and Computational Fluid Dynamics (CFD) simulation as a validation method, the results indicate that different ventilation configurations impact actual ventilation efficiency, with a maximum deviation in ventilation effectiveness exceeding 40%. A more enclosed indoor environment is noticeably disadvantageous for ventilation. Closing natural openings results in a decrease in Air Changes per Hour (ACH) ranging from a decline of 2.36% to a maximum reduction of 30.71%. Additionally, due to the deposition of CO2 concentration, designing pitch angles based on spatial elevation slopes contributes to a better ventilation effect along airflow paths from high to low positions.

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