A guarded-hot-plate apparatus for measuring effective thermal conductivity of insulations between 80 K and 360 K

This report describes a guarded-hot-plate apparatus used to determine the effective thermal conductivity of glass fiber insulations.Measurements can be performed at temperatures from 80 K to 360 K, from atmospheric pressure to a vacuum of 10-4 p a (i x 10~6 torr).Various fill gases such as air, n…