STP718

    Discussion on Experiments to Separate the “Effect of Thickness” from Systematic Equipment Errors in Thermal Transmission Measurements

    Published: Jan 1980


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    Abstract

    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.

    Keywords:

    apparent thermal conductivity, thermal insulation, fiber glass, heat flow meter, errors in measurement, effect of thickness, septum, infrared radiation


    Author Information:

    Pelanne, CM
    Research associate, Johns-Manville Research and Development Center, Denver, Colo


    Paper ID: STP29283S

    Committee/Subcommittee: C16.30

    DOI: 10.1520/STP29283S


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