A Guarded Hot Plate Apparatus for Effective Thermal Conductivity of Insulations at 80–360 K
This report describes modifications made to a guarded hot plate apparatus located at NBS/Boulder and used to measure materials having very low thermal conductivity, such as glass-fiber insulations. Measurements can be performed at temperatures from 80 K to 360 K, and from atmospheric pressure to a vacuum of 10−4 Pa. Various fill gasses (air, nitrogen, argon or helium) can be used. Overall uncertainties in thermal conductivity at atmospheric pressure are estimated to be 1% at the higher temperatures and 5% at the lower temperatures.
KeywordsEffective Thermal Conductivity Heater Plate Cold Plate Heat Leak Main Heater
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