Study on Suppression of Dew Condensation for lnsulation made of Cellulose Fiber
| Project/Area Number |
06650666
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Architectural environment/equipment
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| Research Institution | Akita National College of Technology |
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Principal Investigator |
YAMAMOTO Satomi Akita National College of Technology Dept. of Industrial Chemistry, Professor, 物質工学科, 教授 (90182625)
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| Co-Investigator(Kenkyū-buntansha) |
SOHRI Takashi Akita National College of Technology Dept. of Urban and Environmental Studies Re, 環境都市工学科, 助手 (10226706)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1995: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1994: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | Insulation / Cellulose fiber / Venting space / Vapor permeance / 木造住宅 / 木造軸組構法 / 結露 |
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| Research Abstract |
Two same sized experimental houses (floor : 7 m^2) were charged with cellulose fiber as insulation. One house (A house) has venting space on the outer side of the wall and the other (B house) has not.
The room temperature and relative humidity were regulated at 22ﾟC and 80% from 7 to 22 o'clock. The regulations were kept for 2 and 4 weeks and the temperature, relative humidity in the insulation were measured in every hour at 40 points of each house. The following results were obtained :
1) Differences in temperature between two houses were not detected.
2) The absolute humidity gradient between both sides of the insulation were observed in A house. The humidity at the onter side of insulation was higher than that of inner side. On the contrary, no humidity gradient was observed in B house. This fact indicates that moisture transfer through the insulation.
3) The moisuture content of the insulation above the cieling in B house was higher (nearly 1.2 times) than that of A house. Venting space in the wall affects to keep the moisture content in the insulation low.
The vapor permeance of cellulose fiber was estimated in laboratory. Absolute humidity of both sides of the in sulation were kept constant and the amount of water vapor transfer during the insulation was measured.
Though the amount of water vapor transfer through cellulose fiber depends on difference of humidity of both sides, that of glass fiber did not show same tendency. The vapor permeance of cellulose fiber estimated 1.9 and is nearly same value of the woodenn fiber board. The adsorption of moisture by cellulose fiber was also detected.
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Report
(3 results)
Research Products
(3 results)
