EVALUATION OF THE THERMAL ENVIRONMENT IN THE OCCUPIED ZONE BY ADPI USING LES ANALYSIS RESULTS : Application of movable nozzle-type supply air outlets in large spaces Part 1

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  • KUBO Ryutaro
    Graduate School of Science & Technology, Meiji Univ.
  • KAJIYA Ryoichi
    Dept. of Architecture, School of Engineering and Technology, Meiji Univ.
  • SAKAI Koji
    Dept. of Architectural Engineering, Faculty of Engineering, Oita Univ.
  • UEDA Toshikatsu
    Research and Development Center, Shinryo Corporation
  • MATSUO You
    Dept. of Architecture, Faculty of Science & Technology, Meiji Univ.

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Other Title
  • LES解析結果を用いたADPIによる居住域温熱環境評価 : 可動式ノズル吹出口の大空間への適用に関する研究(第1報)
  • LES カイセキ ケッカ オ モチイタ ADPI ニ ヨル キョジュウイキ オンネツ カンキョウ ヒョウカ カドウシキ ノズル フキダシグチ ノ ダイクウカン エ ノ テキヨウ ニ カンスル ケンキュウ ダイ1ポウ

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Abstract

Nozzles or slotted supply air outlets are used for air conditioning in large spaces because its throw is long and these outlet types cause the least noise. One of the disadvantages of fixed nozzles, however, is that in the case of air conditioning, the current of cold air is directed straight at the occupied zone, often causing a cold, uncomfortable draft. Since air jets tend not to spread very much, there also occur stagnant volumes in locations not reached by the jets, which can result in unsatisfactory air quality. The number of air outlets must be increased to eliminate this problem. In order to maintain a uniform temperature and airflow throughout the occupied zone, air conditioning system designers generally select the number of outlets either using existing design guidelines or values accepted in the industry through experiment or practical experience. We propose herein movable nozzles, which include the following benefits: (1) A reduction in the number of necessary air conditioning outlets due to improved jet terminal velocities and diffusivities in the horizontal occupied zone; (2) reduction in stagnant portions and elimination of dirty air "pockets" in the occupied zone; (3) uniform temperatures and airflow distribution throughout the horizontal occupied zone; and (4) improvement in perceived comfort and coolness due to time-dependent fluctuations in airflow generated by airflow oscillation and other factors. In this study, the environment resulting from regular design and that resulting from movable-nozzle design were compared using LES (Large Eddy Simulation). ADPI (Air Diffusion Performance Index), an indicator of the conditions in the occupied zone during air conditioning, was calculated, and confirmed the effectiveness of air conditioning using movable nozzle outlets.

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