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The radiation-related “effect of thickness” in nonhomogeneous insulations can be readily confused with equipment-related effects resulting from increases in the thickness of the measurement. The relatively unexplored effect-of-thickness phenomenon and the requirements imposed by the ASTM Tests for Steady-State Thermal Transmission Properties by Means of the Guarded Hot Plate and Heat Flow Meter (C 177–76 and C 518–76, respectively) have prompted the rapid development of equipment to measure insulations at full-use thickness.
This paper discusses the problems which arise from attempts to accurately measure insulations at full thickness, a relatively unknown area of measurement, and suggests a method for the separation of the actual effect-of-thickness phenomenon from the errors induced by the equipment.
apparent thermal conductivity, thermal insulation, fiber glass, heat flow meter, errors in measurement, effect of thickness, septum, infrared radiation
Research associate, Johns-Manville Research and Development Center, Denver, Colo