自然に学ぶ省エネ賢材
Nature Inspired Energy Saving Housing Materials

井須 紀文
Norifumi Isu

日本知財学会誌 Vol.13 No.2 p.39-42 (2016-12-20)
Journal of Intellectual Property Association of Japan Vol.13 No.2 p.39-42 (2016-12-20)

＜要旨＞　
地球環境への負荷低減のため，CO2排出量80% 削減を目指した研究開発を進めている．そのためには，つくる，つかう，もどす，の各段階で環境負荷低減と商品価値向上を同時に実現する必要があり，その一つのヒントは自然にあると考えている．事例として，古くから身近な建築材料として用いられてきた土に学び，ナノ多孔質構造を制御した電気を使わずに自律的に湿度を調整する調湿タイルと薄くて耐久性が高い粒子系真空断熱材について述べる．また，真空断熱材についてはヨーロッパが先導してISO化が進行中であり，その状況についても紹介する．
<Abstract>
The future manufacturing for the recirculation-based society needs to take into consideration environmental impact for the earth and functions for people simultaneously. The energy consumption for air conditioning of houses and buildings accounts for about 27% of household energy consumption in Japan (34.3 billion J), and energy conservation in this field is an important challenging issue. One of the most effective methods of reducing the amount of energy is to improve the autonomously humidity control property and the thermal conductivity of the indoor materials. The authors have investigated the functional indoor housing materials having nanopore structure. Two examples using the nanotechnology to build healthy and comfortable dwelling space were explained. One is mesoporous ceramic tile using soil to control indoor humidity autonomously and adsorb VOCs. The other example is the vacuum insulation panels (VIP) having thermal conductivity of 0.005 W/mK. The nano porous silica particle used had the mean particle size of 5 μm and the mean pore diameter of about 30 nm. The VIPs reduced the electrical power consumption by 25 to 54% in the field test, showing the effectiveness of energy-saving renovation.

＜キーワード＞
ナノ多孔質構造，自然に学ぶ，土，調湿，真空断熱材
<Keywords>
Nano Porous Structure, Nature-inspired, Soil, Self-humidity Control, Vacuum Insulation Panel