利用雙層金屬牆熱浮力通風系統改善室內熱環境之模型研究

Model Study to Improve Indoor Thermal Environment by Using Buoyancy Ventilation in Double Metal Walls

劉彥廷(Yen-Ting Liu) ； 喻新(Hsin Yu)

《國立宜蘭大學工程學刊》 12期 (2017/12) Pp. 151-165

https://doi.org/10.6176/BCE.201712_(12).0008

摘要

本研究目的為利用模型實驗驗證雙層金屬牆在受熱後產生熱浮力通風改善室內環境之效果與理想設計尺寸。模型實驗是在金屬外牆外再加上一層外殼達到雙層牆的概念，由最外層的高溫金屬外牆加熱雙層牆之間之空氣層，在上方朝外的方向開孔讓加熱的空氣可以流出，底部開口可以讓低溫空氣流入雙層牆，形成類似太陽能煙囪之效果使得空氣對流，進而減少內牆接收的熱量以及室內環境溫度。實驗結果發現空氣層厚度為0.02 m時可以產生的最大空氣流量，最大可達1.58 m^3/hr；空氣層越厚，內牆接收的熱量越少，室內溫度上升也較少。雙層牆內牆溫度較室外氣溫增加幅度比單層金屬牆低，顯示雙層牆熱浮力通風系統具有改善室內熱環境成效。

關鍵字

太陽能煙囪 ； 雙層牆 ； 熱浮力通風

並列摘要

The purpose of this study is to verify the effect of buoyancy ventilation of the double metal walls with heating to improve the indoor thermal environment and to find the ideal design scale. The model experiment is based on the idea of adding a layer of shell to the interior single wall, then the outer high-temperature outer wall heats the air between the double walls. The heated air can flow out form the opening of the double wall in the upward direction, the bottom opening then let the low-temperature air flow into the double wall and form the effect like a solar chimney. The removed heated air reduces the amount of heat received by the interior wall and the indoor temperature of the room. The experimental results show that the maximum air flow can be generated when the air layer thickness is 0.02 m with airflow rate of 1.58 m^3/hr. The thicker air layer makes lower surface temperature of the interior wall, and less room temperature rise. The surface temperature of double walls beyond the exterior air temperature is less then the surface temperature of single metal wall beyond the environment, that indicate the buoyancy effect of double metal walls can improve the thermal environment of room.

並列關鍵字

Solar Chimney ； Double Wall ； Buoyancy Ventilation