Effective thermal conductivity for fibrous insulation.

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  • 繊維質断熱材の有効熱伝導度
  • センイシツ ダンネツザイ ノ ユウコウ ネツ デンドウド

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Abstract

The purpose of this paper is to develop a model for predicting the effective thermal conductivity of fibrous insulation. A heat transfer model was proposed, considering both the conduction and the radiation forms of heat transfer, based on a unit cell model. The effective thermal conductivities at room temperature for a ceramic fibrous thermal insulation blanket composed of Al2O3 ; 0.92 and SiO2; 0.08 were obtained by the guarded hot plate method in the range of air pressure from 1 to 105 Pa and packed densities ρ from 50 to 183 kg/m3. These experimental results were satisfactorily correlated by the proposed heat transfer model, in which the fitting parameters were independent of air pressure as well as packed density.

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