Abstract
An estimation method of the plane directional thermal conductivity of fibrous insulation using both the cyclic heat and transient hot-wire methods is proposed. Namely, the thermal conductivity in the direction of the plane λ_x is shown to be equal toλ_h^2/λ_y, whereλ_y andλ_h are the thermal conductivities in the direction of the thickness and measured using transient hot-wire method, respectively. In this paper, thermal conductivities of rockwool (ρ=76 and 121kg/m^3) are measured in the temperature range 100℃ to 600℃ using the transient hot-wire estimated values onλ_x, it is confirmed that the present simple method can estimate the measured values fairly well even in the case of different bulk density of the same kind of specimen.
