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Thermal conductivities of fibrous insulations with low bulk densities of 28, 63, and 78 kg/m$^3$ were measured using the Cyclic Heat Method for various heating periods over the temperature range from ...60 to 400 $^circ$C. Proper heating periods for measuring thermal conductivities of such sort of insulations by the Cyclic Heat Method are shown to be determined by an equation that relates thermal diffusion length, thermal conductivity, and heat capacity. The measured results obtained under proper heating periods agreed well with those obtained by the conventional Guarded Hot Plate method. Furthermore, it is shown that, in the case where a temperature wave vanishes while propagating through a specimen, the thermal conductivity of the specimen can be given as a geometrical mean of the two kinds of the thermal conductivities obtained by the phase difference and by the amplitude decay of a temperature wave.show more
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