進風口加裝導流板之紊流型無塵室流場數值模擬及熱舒適性評估

CFD simulation and thermal comfort evaluation of a turbulent type clean room having inlet deflectors

蔡榮貴(Jung-Keui Tsai)

指導教授 ： 簡良翰

國立臺北科技大學/機電學院/冷凍空調工程系所/碩士(2006年)

https://doi.org/10.6841/NTUT.2006.00159

摘要

潔淨室的進風口加裝導流板可避免長時間人員作業處於進風口下方所造成的不舒適性。本研究以數值模擬方式分析探討紊流型進風口加裝導流板，對於空間流場及熱舒適性之差異影響。利用計算流體力學軟體，以ISO 和 ASHRAE 兩種標準所採用的PMV、PPD、ADPI等熱舒適度指標探討進風口加裝導流板其流場影響。
模擬結果顯示進氣口加裝導流板之後，對於室內坐姿高度作業空間舒適性可明顯的改善，其速度場變得較穩定，壓力較均勻，但空氣年齡較高。以熱舒適性指標PMV(Predicted Mean Vote)來看，無導流板則顯示在越接近進風口PMV值越偏低。加裝進風導流板在人體工作區域熱舒適性較一致，PPD指標所顯示之趨勢則與PMV相似。有、無導流板的室內溫度差異不大，因此以溫度範圍為主要依據的ADPI指標，顯示之差異也有限。
本研究並以導流板高度、大小、進風速度、空間高度等參數為模擬之變因，並依據模擬結果歸納出導流板設計原則。

關鍵字

數值模擬CFD ； PMV ； PPD ； ADPI ； 進風導流板

並列摘要

Installation of a deflector under the supply air opening can reduce the discomfort of the workers in a clean room working under the opening for a long period of time. In the present study, numerical simulation has been performed using a computational fluid dynamic software to analyze the influence of space flow field and different thermal comfort levels after installing a deflector into turbulence type of supply openings. The simulation results lead to the discussion of the influence of flow field and levels of comfort, based on the thermal comfort indicators, PMV, PPD, and ADPI, which are adapted by the two organizations, ISO and ASHRAE.
The result of simulation shows that the filed of velocity and the levels of pressure is more uniform in the seating working space after a deflector was added. Hence, the comfort levels increases, but the age of air is getting older. Without a deflector, the comfort levels indicator, PMV value, decreases as the space closer to the supply opening. After a deflector is installed, the comfort level is more uniform in the working zone. The PPD indicator shows a similar trend as PMV. However, the temperature uniformity does not change much no matter whether a deflector is installed or not. Therefore, the ADPI indicator, which is mainly based on range of temperature, showed negligible difference.
The study also performed a numerical parametric study of the deflector’s parameters, including the deflector height, size, the speed of flow, and the height of working space. Based on these simulations, the design principles of a deflector are concluded.

並列關鍵字

Numerical simulation CFD ； PMV ； PPD ； ADPI ； supply opening ； deflector

參考文獻

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