暖房時における置搎搎気用ペリメータレスシステムの実騳: 一般環境における置搎搎気に関する研究　その1

摘要

Ventilation by displacement is a type of ventilation where the air flow is thermally driven. By this arrangement one obtains two zones in the room - a lower zone with supply air conditions and an upper recirculation zone with extract air conditions. Cold climate causes downdraught from windows and external walls and results in a mixing of air from the upper into the lower zone. To avoid this problem during cold climate a new principle for ventilation by displacement is tested. Excess heat from the upper zone of the room is used for heating cold surfaces. The principle involves creation of a narrow space in front of the exterior wall, separating the cold wall from direct contact with room air. Extract air from the ceiling level is forced down through this space by an extraction fan. This method can advantageously be applied in large buildings where an external wall mainly consists of glass panes. In this case it might be appropriate to utilise the space between the inner couple of glasses for extract air. Tracer gas and temperature measurements were carried out in a test-room. The result shows that the ventilation efficiency improves when using the new principle. The thermal climate also improves due to less down-draught and higher surface temperatures.%置換換気・空調方式（以降、置換換気方式）は空気の密度差を利用rnした換気・空調方式であり、一般に室内下部から室内設計温度よりrnやや低い空調空気を低速で給気し、室内上部で排気を行う。居住域rnに存在する人体等の発熱体（汚染源）上の熱上昇流により、室内ではrn温度成層が形成されるとともに、発熱体周りから発生する汚染質はrn居住域から室内上部へと速やかに輸送される。