廠房通風效果受到許多因素影響，其中廠房內部流場分布均勻度的影響
尤其重要。欲使廠房內部流場達到高均勻度，必須調整進氣均勻度以及進
氣口分布。本研究使用計算流體力學(CFD)套裝軟體，針對常見的通風管道
(直管、彎管與擴張管)流場進行分析，探討出氣均勻的設計方法，並將這些
設計方法使用在矩形廠房的稀釋增壓以及發酵室的堆肥增產。直管出氣的
均勻度必須考慮管內壓力分布，因此必須適當設計各出氣口的尺寸與間隔；
彎管出口的均勻度必須考慮導葉片的設計；擴張管出口的均勻度必須考慮
使用分流板、格柵、多孔板的設計。傳統正壓廠房設計僅考慮輸入風量須
達到最低需求氣量，忽略了「管道配氣」與「廠房配氣」對於廠房內流動型
態的影響，因此經常會發生廠房內空氣流速、溫度、污染物濃度分佈極不
均勻的情況。使用本研究所發展的高均勻度出氣直管搭配適當的管道配置、
高度與出氣窗戶設計於正壓廠房設計，經CFD 計算調整，可在廠房作業區
得到目標風速、溫度與濃度。模型實驗證實，所發展的直管出氣與廠房配
氣設計均可達到預期的流場型態與目標值。彎管與擴張管整流設計方法，
可得到管道出口極高速度分布均勻度。將這些設計法使用於發酵室的入口
管道設計，可使發酵室堆肥產量有效率大為增加。

The performance of a ventilation system for an industrial plant is influenced
by several factors. The most important influential parameters are the ventilation
flow rate and the distribution of airflow in the working space. The conventional
design method of the general ventilation for the industrial plane focused primarily
on supplying sufficient fresh air flow (ventilation flow rate) from environment to
the plant. The consideration on the airflow distribution is generally ignored. The
design method without considering the airflow distribution used conventionally
frequently induce large recirculation bubbles and/or low airflow speed areas in
the plant, even though the supplied airflow rate is drastically large. Unexpected
large pollutant concentration and high temperature may appear in the
recirculation bubbles and/or low airflow speed areas and lead to harmful and/or
uncomfortable working environment. The present study focused on developing
design methods of air conveying piping as well as the piping and windows
deployments to achieve target uniformity of airflow distributions in the plat. The
fundamental design principles and methods that could lead to high uniformity of
airflow distributions were developed using a computational fluid dynamics
software. The design methods were successively applied to two aspects—the
designs of the positive pressure plant and the compost-producing factory. The
design methods of the piping elements, such as the guide vanes, honeycomb, grids,
and perforated plates, were also developed to obtain uniform flow at the exit of
the pipes with turning angles and large expansion sections. Experiments were
conducted to validate the developed design methods. The experimental results
showed satisfactory performance of the developed design methods.

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