建立一個評估排氣櫃控制奈米微粒與VOC氣體的通風控制效率之測試方法

Development of a Test Method for Evaluating the Ventilation Control Efficiency of Fume Hood for Nanoparticles and VOC Gas

本研究探討了通風排氣櫃對奈米微粒（Nanoparticles, NPs）與揮發性有機化合物（Volatile Organic Compound, VOC）氣體的的通風控制效率，奈米微粒與VOC氣體的來源分別使用氯化鈉（Sodium Chloride, NaCl）固體微粒與異丙醇（Isopropanol, IPA）氣體，且使用定風量排氣櫃（Constant Air Volume, CAV）來進行實驗測試，並且評估不同操作條件下的影響。結果顯示，在排氣櫃拉門全開且面速度為0.20 m/s的條件下，奈米微粒的控制效率為86.24±8.44％，異丙醇氣體為88.79±13.76％。當將拉門降低至半開且面速度提升至0.45 m/s時，通風控制效率明顯提高，奈米微粒與異丙醇的通風控制效率皆提高99％以上，顯示出較小的拉門開口與較高的面速度可以有效減少奈米微粒及異丙醇氣體的逸散。此外，研究還探討了污染物釋放位置對通風控制效率的影響。當釋放來源從排氣櫃中央移至側邊時，通風控制效率略有下降，可能是由於壁面附近的紊流增加污染物逸散的機會。然而，當拉門降低且面速度提高時，通風控制效率再次提升。結果顯示，不論釋放位置如何，較高的面速度及較小的拉門開口能更有效地控制奈米微粒及異丙醇氣體的逸散。本研究建立的實驗方法可應用排氣櫃的控制奈米微粒與VOC氣體的通風控制效率測試。

This study investigates the ventilation control efficiency of fume hoods for nanoparticles (NPs) and volatile organic compound (VOC) gas. The sources of nanoparticles and VOC gas were used the sodium chloride (NaCl) solid particles and isopropanol (IPA) gas, respective-ly. The constant air volume (CAV) fume hood was assessed with conducted on the influence of different operating conditions. The results indicated that, under the condition of a fully opened sash with a face velocity of 0.20 m/s, the ventilation control efficiency for nanoparti-cles was 86.24±8.44%, and for isopropanol gas was 88.79±13.76%. When the sash was de-creased to half-open, and the face velocity was increased to 0.45 m/s, the ventilation control efficiency was improved significantly, with both nanoparticles and isopropanol gas ventila-tion control efficiency above 99%. This demonstrates that a smaller sash opening and higher face velocity can effectively reduce the leakage of nanoparticles and isopropanol gas.
Additionally, the study explored the influence of source release position on ventilation control efficiency. When the release source was moved from the center to the side of the fume hood, the ventilation control efficiency slightly decreased, likely due to increased turbulence near the wall, which enhanced contaminant leakage. However, when the sash was decreased to half-open and the face velocity was increased, the ventilation control efficiency improved again. The results indicate that regardless of the source release position, a higher face veloc-ity and a smaller sash opening can more effectively control the leakage of nanoparticles and isopropanol gas. The experimental method established in this study can be applied to test the ventilation control efficiency of fume hoods for controlling nanoparticles and VOC gas.