Abstract
This paper reports the first systematic study of the spectral radiation heat transfer through the ultra-fine powder insulation Aerosil 380. Experimental results are obtained for the spectralextinction coefficient from infra-red transmission measurements and for the effective thermal conductivity using a guarded-hot-plate apparatus. These results are compared and assessed with relevant theoretical calculations. In comparison to total effective conductivity experiments in the temperature range of 320–400 K, radiation heat transfer accounted for approximately 10% of the total heat leakage through the insulation, with the remaining by gaseous conduction. At high temperatures, the radiation contribution is expected to increase sharply, reaching over 50% at about 1000 K.
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