TED-AJ03-546 ESTIMATION OF PLANE DIRECTIONAL THERMAL CONDUCTIVITY OF FIBROUS INSULATION
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概要
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In the previous study, an estimation method of the plane directional thermal conductivity of fibrous insulations using the cyclic heat method and the transient hot-wire method is proposed. By assuming that the thermal conductivity λ_h of anisotropic materials measured by the transient hot-wire method is equivalent to that of the isotropic materials which have the same bulk density p and specific heat c as the anisotropic materials, the thermal conductivity λ_h is shown to be equal to the square root of λ_xλ_y, which is a geometrical mean of the thermal conductivities in the direction of the plane λ_x and the thicknessλ_y of the anisotropic materials. From comparison of the estimated results with the measured values on the alumina silica blanket (the bulk density p=125kg/m^3) in the temperature range of -140 to 300℃, the estimation method has been proved to be adequate. In the estimation, for isotropic materials like polyurethane foam and calcium silicate, the thermal conductivity λ_x has been confirmed to be equal to λ_h. Following this study, we have successfully applied the estimation method to the rock wool insulation in the[figure] temperature range, 100 to 600℃. In this study, first, we checked whether the present measuring system, which consists of the cyclic heat and transient hot-wire methods, provides reliable results or not by using such isotropic materials as polyurethane foam, calcium silicate, and brick over the temperature range of -180 to 800℃. Next, the thermal conductivities λ_h, λ_x, and λ_y were measured for the alumina silica blanket in the temperature range of 300 to 1000℃ using the transient hot-wire method for λ_h and the cyclic heat method for λ_x and λ_y. Further, the thermal conductivities of the alumina silica board, which is composed of fibers and spherical shaped particles, were measured in the temperature range, 300 to 900℃. From a fairly good agreement between the measured results with the estimated values of λ_x, the proposed method is confirmed to estimate the measured values reasonable well.[figure]
- 一般社団法人日本機械学会の論文
著者
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Tomimura Toshio
Institute For Materials Chemistry And Engineering Kyushu University
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OHMURA Takahiro
Research & Development Dept., NICHIAS Corporation
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TSUBOI Mikinori
Research & Development Dept., NICHIAS Corporation
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ONODERA Masatake
Research & Development Dept., NICHIAS Corporation
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Tsuboi Mikinori
Rd Dept. Hamamatsu Research Center Nichias Corp.
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Ohmura Takahiro
Rd Dept. Hamamatsu Research Center Nichias Corp.
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Onodera Masatake
Rd Dept. Hamamatsu Research Center Nichias Corp.
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Tomimura Toshio
Institute of Advanced Material Study, Kyushu University
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