研究生: |
林岷翰 Min-Han Lin |
---|---|
論文名稱: |
橫向流機械通風技術設計方法 —負壓廠房 Design Methods of Forced General Ventilation for Sub-Atmospheric Pressure Plant |
指導教授: |
黃榮芳
Rong-Fung Huang 許清閔 Ching-Min Hsu |
口試委員: |
黃榮芳
Rong-Fung Huang 閻順昌 Shun-Chang Yan 許清閔 Ching-Min Hsu 趙振綱 Ching-Kong Chao |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2022 |
畢業學年度: | 110 |
語文別: | 中文 |
論文頁數: | 49 |
中文關鍵詞: | 整體橫向流機械通風 、負壓廠房 、凸緣與隔板應用 |
外文關鍵詞: | Forced General Ventilation, Sub-Atmospheric Pressure Plant, Flange and plate |
相關次數: | 點閱:265 下載:7 |
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傳統工業廠房使用的「整體通風」方法效果往往不彰,原因是一般手冊或法規內僅考慮需求總風量,並未考慮流體在室內流動時的物理特性;因此,常可能導致室內形成局部或大片的「迴流區」及「低速區」,使得汙染物與/或熱不易排出。為了解決上述問題,使廠房或建築物的空氣流通順暢,並降低悶熱程度,本研究使用流體力學方法設計、分析,將結果歸納發展出「橫向流機械通風設計方法」。
以計算流體動力學(CFD)套裝軟體依序針對「一般高度廠房」、「挑高廠房(有上方凸緣、無隔板)」與「挑高廠房(有上方凸緣與隔板)」三種情況,於廠房內裝設凸緣、隔板、中繼凸緣、上凹隔板之條件下,分析這些裝置於不同的長度與位置下的流場特徵、速度場與溫度場,分別找出應用於不同廠房最佳的設計,使廠房工作區內「無迴流區」與「無大片低速區」,且不致於使廠房上層溫氣與涼氣交混,可以順暢排出熱氣與污染物;再者,風扇的轉速因此可以降低,維持需求的風量以使室內空氣流動從上游到下游達到需求速度即可,可降低電力消耗與噪音。利用雷射輔助流場可視化技術,透過實驗比較縮尺廠房在遵循「中繼凸緣設計方法」前後,廠房內流場特徵的改變,此實驗結果不僅與 CFD 模擬的流場特徵符合,也證實加裝中繼凸緣有助於改善流場原本邊壁處迴流區與低速區的問題。
The conventionally used methods for mechanical ventilations of
industrial plans were usually inefficient because large recirculation and
low (or almost stagnant) velocity regions were frequently induced due to
the random arrangements of fans and windows. To find the in-depth
problems of the conventional methods and to develop reasonable and
efficient methods of design for the indoor mechanical ventilation, the
regular-height and tall industrial plants were studied and analyzed using a
commercial computational fluid dynamics (CFD) software. The features of
the calculated flow and temperature fields were employed as the indices
for identification and recognification of the ventilation quality. Three
categories of ventilation arrangements were studied: (1) blowing air into
the room at one end wall and drawing air out of the room at the opposite
wall (denoted by push-pull), (2) drawing air out of the room at one end wall
with windows (openings) at the opposite wall (denoted by pull-window),
and (3) blowing air into the room at one end wall with windows (openings)
at the opposite wall (denoted by push-window). The appropriate spacing
between the neighboring fans, the fan and the wall, the fan and the
ceiling/floor, and the neighboring windows which would induce spiral flow
without recirculation and local low velocity regions were firstly found out.
These characteristic spacing were fundamental dimensions for lay out of
the fans and windows and could be used initially and generally for design.
A ceiling flange technique was successfully developed for the tall
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industrial plants to obtain spiral flow without recirculation and local low
velocity regions and to adopt tall apparatus which may be used in the plants.
The developed fundamental methods could be tailored by little
modifications to apply to irregular geometries and special conditions. For
instance, in the case that the fans and the windows must be reduced in rows
due to the imposed regulations and/or strengths of constructions, the
venetian blinds with appropriate design could be added to the fundamental
design methods. The analysis results and developed methods were
illustrated and discussed in the thesis.
[1] Bustamante, E., Calvet, S., Estelles, F., Torres, A. G., and Hospitaler, A., “Measurement and Numerical Simulation of Single-sided Mechanical Ventilation in Broler Houses, ” Biosystems Engineering, Vol. 160, 2017, pp.56-68.
[2] Teitel, M., Levi, A., Zhao, Y., Barak, M., Bar-lev, E., and Shmuel, D., “Energy Saving in Agricultural Buildings through Fan Motor Control by Variable Frequency Drives, ” Energy and Buildings, Vol. 40, 2008, pp.953-960.
[3] 黃榮芳、林楷玲、許清閔,「工業通風—原理與實務」,工礦安全衛生技師公會全國聯合會,台北,2018,ISBN:9789869651707。
[4] Matsson, J. E., “An introduction to SolidWorks Flow Simulation 2013, ” SDC Publications, Mission, 2019, pp.11-16.