| Project/Area Number |
62560162
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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 |
林産学
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| Research Institution | Gunma University |
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Principal Investigator |
KATO Koichi Gunma University・Associate Professor, 教育学部, 助教授 (80126846)
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| Co-Investigator(Kenkyū-buntansha) |
UEDA Masafumi Gunma University・Professor, 教育学部, 教授 (50008116)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1988: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1987: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Condensation / Condensation in a wall / Moisture Conductivity / Simultantaneous heat and moisture transfer equations / Air layer / 恒温恒湿層 / 恒温恒湿槽 / 水分拡張係数 |
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| Research Abstract |
To establish a planning method of a moisture-protected wall, we examined the influence of wall construction on the condensation process in a wooden wall and expressed that process by a simultantaneous heat and moisture transfer equations. The results obtained are as follows: 1) The transfer coefficients contained in the equations haven't been measured about woods and wooden materials. We measured the moisture conductivity under moisture content-gradients or temperature-gradients about several wall materials, and applied the equations to a drying process of wood and a condensation process in a single layer wall. The calculated values of moisture content in the material were nearly equal to the observed values. Therefore, it was recognized that the equations became a useful method to evaluate the condensation process. 2) The condensation process in the three layers walls which were constructed with two plates and an air layer between them were examined. We expressed an air layer by a mathematical model which is equivalent to moisture or hear transfer coefficient, and calculated the condensation process in a wall numerically. The influences of wall materials, thickness of an air layer, and the situation of a vapor barrier installed were investigated. It was recognized that a wall which hadn't a varrier on the exterior tended to avoid the moisture condensation. The calculated values of temperature agreed with the observed values. However, the caluculated values of the relative humidity in an air layer didn,t agree with observed values. 3) Several constant humidity boxes by using the saturated salt solution were examined in connection with the studies mentioned above. Some technical results were obtained about getting a constant humidity.
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