辦公空間換氣系統進出風口的排列與濃度相關性研究

Abstract

近年來,由於社會大眾對於室內空氣品質的注重與要求以及目前台灣辦公室空氣品質與通風系統設備的現況,因此本研究目的設定為設計出辦公室通風換氣系統進出風口位置與排列對於二氧化碳濃度有最佳的淨化效果,希望以更有效與簡便的方法淨化室內空氣,也讓辦公人員有更好的工作環境。 本研究利用 SOLIDWORKS 與 Ansys Fluent computational fluid dynamics (CFD)進行繪畫設計出模擬的辦公室空間與流場與濃度模擬。模組中有不同的參數變化像是有不同尺寸的辦公空間與進出風口位置與高度的排列組合,並且再加入辦公人員或使用有無檔板的辦公桌加入比較,進行參數各排列組合比較換氣效果差異。 本研究根據模擬結果發現當空間只有一套換氣系統時,隨著空間變大,新鮮空氣會無法到達每個角落,因此應依空間大小搭配不同數量的通風換氣系統。而當空間中有汙染物時,通風換氣系統於對角位置,當流量達到一程度時,發現其實進出口風高度差並不會造成太大影響,但有檔板的辦公桌對於通風換氣效果會有較佳的作用。但是當空間變大時,會發現雖然通風換氣系統流量相同且都位於對角時,通風換氣系統有兩套的換氣效果會好於只有一套通風換氣系統的換氣效果,且進出風口高度差較大時效果也會好於進出風口高度差較小時。 最後,雖然很多建築規範中都已經寫到通風換氣系統應安裝最遠距離為對角位置,才能有較好的通風效果。但是經由本研究發現,這樣的理論在小房間是成立的,但是當空間變大時,就算是安裝對角或流量到達時,卻沒有搭配不同數量與位置的換氣系統或是變化進出風口高度,對於換氣效果是有限的。因此本研究得到結論為,對角換氣系統有一定的空間大小限制,但當空間變大時,應規劃多套通風換氣系統排列才能達到良好的換氣效果,讓我們有更良好的室內空氣品質環境。

In recent years, the public's attention to indoor air quality and the current situation of Taiwan's office air products and ventilation system equipment, the goal of this research was set to optimize location and arrangement of the entrance and exit of the ventilation system in the design office for purification of carbon dioxide concentration. As a result, we hope to purify the indoor air in a more effective and convenient way, so that office workers have a better working environment. In this study, SOLIDWORKS and Ansys Fluent computational fluid dynamics (CFD) were used for drawing design and simulation. It was necessary to discuss the simulation of office space and flow field and concentration simulation under different parameters. According to the simulation results, this study found that many building codes have written that the ventilation system should be installed at the longest distance in a diagonal position to have a better ventilation system. However, through this study, it was found that such a theory is established in a small room, but when the space becomes larger, even if it is installed diagonally or the flow arrives, it is not equipped with a different number and position of the ventilation system or the length of the inlet and outlet. The effect on ventilation will be limited. Therefore, this study concluded that the diagonal ventilation system has a space size limit. When the space becomes larger, multiple arrangements of ventilation systems should be planned to achieve a good ventilation effect. We also hope that through these methods, we will have a better indoor air.