THE EFFECTS OF PRESSURE DIFFERENCE ON THE PERFORMANCE OF SHUT-OFF OF HEAT AND AIR FLOW OF BLOWING DOWN TYPE AIR CURTAIN LOCATED ON THE HEAD OF APERTURE

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  • 内外差圧が開口部上部設置型縦吹降式エアカーテンの熱・気流遮断性能に与える影響
  • 内外差圧が開口部上部設置型縦吹降式エアカーテンの熱・気流遮断性能に与える影響 : 模型実験・CFD解析による検証
  • ナイガイ サアツ ガ カイコウブ ジョウブ セッチガタ タテスイコウシキ エアカーテン ノ ネツ ・ キリュウ シャダン セイノウ ニ アタエル エイキョウ : モケイ ジッケン ・ CFD カイセキ ニ ヨル ケンショウ
  • 模型実験・CFD解析による検証
  • Verification of model experiment and CFD analysis

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Abstract

 Heat loss tends to occur at building entrances by invasion of outdoor air and leakage of indoor air because the entrance is opened by people's passage. So reducing the inflow / outflow of airflow at building entrance is important in consideration of the thermal environment and energy saving of the building and energy-saving. Air curtain is one of the methods for reducing the external air load at building entrance. Since the air curtain shut-off between inside and outside by blowing out wind, it is susceptible to temperature and pressure differences. Final goal is performing an evaluation of the energy saving when air curtain is installed to real building. This paper is a basic study for the goal considered the change of parameters around the outlet and the aperture with temperature difference and pressure difference by model experiments and CFD analysis.<br> In model experiments, experiments using shrinking models are performed under isothermal condition. And we created a CFD model that reproduces experimental equipment, comparing experiments and CFD analysis results, consistency of both methods was confirmed.<br> In case study with CFD analysis, we conducted steady state analysis and unsteady state analysis. Steady state analysis considered the influence of the change of the size of the outlet and the opening on the shut-off performance with isothermal condition was clarified using experiment model and the influence of temperature difference on shut-off performance of AC using retrofit simple model. Unsteady state analysis considered the influence of human passing using experiment model and the influence of using automatic door and air curtain together using retrofit simple model.<br> Steady state analysis with isothermal condition by experiment model has 6 study case, blowing speed, opening height, opening width, outlet width, outlet length, blowing angle. Among these, it became clear that the influence of blowing speed and outlet width factors on shut-off performance is particularly large. Steady state analysis with non-isothermal condition by retrofit simple model has 2 study case, summer and winter. It became clear that the influence of the temperature difference on the outside air invasion amount is small and the heat shut-off rate is equal to the airflow shut-off rate with pressure difference. Finally, in steady state analysis, it became clear that the performance of shut-off of air curtain can be approximated to one formula.<br> Human passing analysis has 3 study cases, number of moving people, moving speed, pressure difference. In number of moving people study, there was a tendency that the quantity of outdoor invasion increased as the number of moving people was increased and differences in quantity of outdoor invasion were also seen by moving form differences. In moving speed study, there was a tendency that the quantity of outdoor invasion increased as the moving speed was accelerated. In pressure difference study, there was a tendency that the quantity of outdoor invasion decreased as the pressure difference was increased. Throughout, the influence of the human passing on the performance of shut-off of the air curtain is small with pressure difference.<br> Air curtain using with automatic door analysis has 2 study case, single door and double door. When calculating the airflow shut-off rate when air curtain is installed single and double door, each performance of shut-off is almost equal to that if the air curtain is installed in the simple opening.

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