新たな換気効率指標と三次元乱流数値シミュレーションによる算出法 : 換気効率の評価モデルに関する研究 New Scales for Ventilation Efficiency and Calculation Method by Means of 3-Dimensional Numerical Simulation for Turbulent Flow : Study on Evaluation of Ventilation Efficiency in Room

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室内における汚染質の拡散性状を基礎とする3種の新たな換気効率の指標を定義する.これは,(1)各場所で汚染質が発生したと仮定した場合の室内平均濃度,(2)同じく,汚染質が発生したと仮定した場合の平均拡散半径,および(3)吹出し空気の平均到達時間,である.これらを用いて,実在のクリーンルーム内の換気特性を考察する.換気効率指標の分布は,(1)吹出し口・吸込み口などを変化させた場合の気流分布の変化による換気効率特性の変化を効果的に示す,(2)室内汚染源の発生位置の変化が室内の清浄度に与える影響を直接的に示す,(3)清浄空気到達の程度を具体的に表す,などの特徴を有し,室内の換気設計を行う際の指標として有用なことが示される.

Three new scales for ventilation efficiency and their distributions in a room are defined in order to evaluate the distribution of 'Ventilation Efficiency' in a room. They are defined according to the distribution of contaminant in a room. (1) SVE 1 (Scale for Ventilation Efficiency 1): a space averaged value of concentration of contaminant in a room; its value is defined at the point where the contaminant is generated as a point source. (2) SVE 2: an average diffusion radius of contaminant dispersion in a room; it is also defined at the point where the contaminant is generated. (3) SVE 3: a concentration value of each point in a room, where contaminant is uniformally generated in the whole space of the room. The distribution of SVE 1 and SVE 2 are calculated by scaning the source point of contaminant in whole space of the room. SVE 1 directly evaluates the exhausting efficiency of contaminant. SVE 2 evaluates the diffusivity of contaminant in a room. SVE 3 is corresponding to the traveling time of air from the supply outlet to each point. These new scales of ventilation efficiency can be calculated by the contaminant distribution which is measured by experiment, of course. However 3-dimensional simulation for turbulent flow and that of turbulent scalar diffusion by means of k-ε two equation turbulence model makes it possible to predict the contaminant diffusion sufficiently in practical application. Thus in this paper these new scales for ventilation efficiency are calculated from the contaminant distribution obtained by 3-dimensional simulation for scalar diffusion using k-ε two equation turbulence model. In order to estimate the utility of these new scales for ventilation efficiency, the characteristics of ventilation efficiency in the conventional flow type clean room are analyzed using of these new scales. The results are as follows. (1) First and second new scales well represent the difference of ventilation efficiency which is caused by changing the numbers of the exhaust inlets and the supply outlets in the same room. (2) These new scales well represent the influence of posision of the contaminant source on the cleanliness of the room air. (3) The third new scale well represents the traveling time of clean air from the supply outlet. And it is easy to know where is far from and close to the supply outlet in a view point of the air flow route. Thus it is confirmed that these new scales for ventilation efficiency are useful for evaluating the distribution of ventilation efficiency in a room.

収録刊行物

  • 空気調和・衛生工学会 論文集

    空気調和・衛生工学会 論文集 11(32), 91-102, 1986

    公益社団法人 空気調和・衛生工学会

被引用文献:  30件中 1-30件 を表示

各種コード

  • NII論文ID(NAID)
    110007864404
  • NII書誌ID(NCID)
    AN00065706
  • 本文言語コード
    JPN
  • 資料種別
    雑誌論文
  • ISSN
    0385-275X
  • NDL 記事登録ID
    3103559
  • NDL 刊行物分類
    NA91(建築設備)
  • NDL 雑誌分類
    ZN5(科学技術--建設工学・建設業--都市工学・衛生工学)
  • NDL 請求記号
    Z16-955
  • データ提供元
    CJP引用  NDL  NII-ELS  J-STAGE 
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