STP718

    Air Intrusion Effects on the Performance of Permeable Insulation Systems

    Published: Jan 1980


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    Abstract

    The R-values of permeable insulation systems are generally determined in test apparatuses designed to assure one-dimensional heat transfer and to assure no air intrusion effects. Such classical R-values are then calculationally employed to help describe in situ heat-transfer rates through insulation systems.

    The research reported herein reexamines the applicability of these classical R-values to commonly encountered insulation systems where air intrusion is physically possible. Several kinds of findings are reported: (a) Laboratory-determined R-values for several types and thicknesses of permeable insulators, under conditions of no externally imposed flows. (b) Laboratory-determined heat-transfer rates for several permeable insulators under conditions of externally imposed flows (air intrusion). (c) Theoretically calculated heat-transfer rates for permeable insulation systems which sustain infiltrative-exfiltrative air intrusion effects.

    The results obtained show that the thermal insulation provided by a permeable insulation system may differ substantially from that which is predicted by simple application of classical R-values.

    Keywords:

    thermal insulation, permeable insulation, infiltration, exfiltration, thermal resistance


    Author Information:

    Berlad, AL
    Professor of engineering, research associate, and graduate students, State University of New York, Stony BrookN.Y.,

    Tutu, N
    Professor of engineering, research associate, and graduate students, State University of New York, Stony BrookN.Y.,

    Yeh, Y-J
    Professor of engineering, research associate, and graduate students, State University of New York, Stony BrookN.Y.,

    Jaung, R
    Professor of engineering, research associate, and graduate students, State University of New York, Stony BrookN.Y.,

    Krajewski, R
    Research engineers, Brookhaven National Laboratory, Upton, N.Y.

    Hoppe, R
    Research engineers, Brookhaven National Laboratory, Upton, N.Y.

    Salzano, FJ
    Research engineers, Brookhaven National Laboratory, Upton, N.Y.


    Paper ID: STP29273S

    Committee/Subcommittee: C16.40

    DOI: 10.1520/STP29273S


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