Apparent Thermal Conductivities of Fiberglass Insulation

Abstract

This paper deals with the thermal characterization of fiberglass insu lation used in baking oven applications. The apparent thermal conductivities of fiber glass bats were measured with a commercially available guarded hot plate k-tester as a function of density, thickness, hot and cold surface emissivities and mean tempera ture levels applicable to range operation and self cleaning conditions. An axisym metnc conduction analysis was performed to estimate the k-tester accuracy, and a few calibration measurements were executed with a fiberglass mat provided by the k-tester manufacturer. The apparent thermal conductivities, measured within the specific ranges of the parameters listed above, were correlated with a model which in cludes the gas and solid conduction, as well as radiation transport.