Volume 6, Issue 6, November 2018, Page: 208-214
Quantitative Study on the Moisture Properties of Japanese Cedar-Estimation of Moisture Permeability Using the Cup Method
Takashi Nakaya, Department of Architecture, Faculty of Engineering, Shinshu University, Nagano, Japan
Received: Sep. 17, 2018;       Accepted: Oct. 29, 2018;       Published: Dec. 14, 2018
DOI: 10.11648/j.ajaf.20180606.18      View  244      Downloads  31
Wood is a common porous material used in building interiors. It is therefore expected to adjust water vapor levels in indoor spaces. To examine humidity adjustment by wood, it is necessary to measure its moisture permeability, and to quantify humidity adjustment by wood, the accurate measurement of moisture properties is critical. This paper focuses on the measurement of the moisture permeability (λ’) of wood (Cryptomeria japonica). First, the measurement theory of the cup method and the error estimation method are described. Then, the moisture-permeability measurement results for the wood are presented. In the cup method, removal of the permeation resistance of the cup (R’cup) was important to estimate the λ’ of the materials. In particular, in the material with low moisture-permeation resistance (e.g. wood shaving), the effect of adding the R’cup was significant. The relationship between average relative humidity(H) and the moisture permeability was experimented. The results of the linear approximation are: Moisture permeability of board: λ’board = 10-6že0.0398H [kg/(mžsžPa)], Moisture permeability of the wood shavings: λ’wood shavings = 9.88ž10-6H+1.20ž10-4 [kg/(mžsžPa)]. The moisture permeability of wood shavings of cedar was about 10 times that of the cedar board. It is therefore confirmed that moisture permeability can be increased by changing the shape of a wooden material.
Permeability, Cup Method, Cryptomeria Japonica, Board, Wood Shaving
To cite this article
Takashi Nakaya, Quantitative Study on the Moisture Properties of Japanese Cedar-Estimation of Moisture Permeability Using the Cup Method, American Journal of Agriculture and Forestry. Vol. 6, No. 6, 2018, pp. 208-214. doi: 10.11648/j.ajaf.20180606.18
Copyright © 2018 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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