異なる熱負荷条件における全面床吹出し置換空調システムの室内熱環境に関する実験研究
オフィス空間1スパン分を模擬した環境試験室で全面床吹出し置換空調システムによる実験を行い、その室内温熱環境および人体の熱的快適性を評価した。本方式では床パネルによる床冷却効果により居住域における温度勾配が小さくなった。熱源の高さが低いほど居住域における上下温度差が大きくなり、内部負荷の増加及び給気風量の減少も大きな温度差を生む結果となった。熱源を集中させると若干の空気温度上昇が見られたが温度勾配は全室内を通してほぼ一定に保たれていた。夏季条件では窓面近傍の床が暖められ室全体の温度成層が乱れた。冬季条件では窓近傍にてコールドドラフトが確認されたが、高さ0.6m以上での温度成層は保たれていた。
Experimental Study on the Indoor Thermal Environment of a Floor-Supply Displacement Air-Conditioning System under Various Heat Load Conditions
A floor-supply displacement ventilation system was evaluated in a large climatic chamber. The temperature gradient in the room could be kept smaller because of the floor cooling effect of the floor-supply system. When the height of heat sources was lowered, the vertical temperature difference in the occupied zone became greater. On increasing the heat load, this effect was found to be more significant. Decreasing the supply air volume caused an increase in the vertical temperature difference. When the heat sources were clustered at one location, a slight temperature rise was observed near the heat sources, but the temperature gradient was kept nearly constant throughout the room. The thermal stratification near the window was destroyed in a summer condition. An cold draft effect was observed in a winter condition, but the thermal stratification above 0.6 m was kept undisturbed.