STP1116

    Prediction of the Thermal Performance of Single and Multi-Airspace Reflective Insulation Materials

    Published: Jan 1991


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    Abstract

    A recent test program to determine the thermal performance of reflective thermal insulation materials and systems was carried out on behalf of the Department of Energy. This program indicated that the thermal performance of multi-airspace reflective cavities (multi-layer reflective insulations) could not be accurately predicted by a one-dimensional analysis applied in combination with the thermal performance data for single airspaces.

    A new correlation has been developed in an effort to improve the accuracy of predicted R-values for multi-airspace reflective systems. This correlation is described and compared to the thermal test data generated by the recent test program.

    Generally good agreement between calculated and measured R-Values is achieved for single airspaces. However, calculated values for multiple airspaces are up to 60 percent greater than the measured values. This disagreement indicates that the commercial multifoil product that was tested may not achieve the idealized one-dimensional heat flow that is true of the correlation.

    Keywords:

    reflective insulations, R-Value, multi-airspace cavities, thermal performance


    Author Information:

    Desjarlais, AO
    Manager of Thermal Insulation EvaluationsChairman, Holometrix, Inc.Tennessee Technological University, CambridgeCookeville, MATN

    Yarbrough, DW
    Manager of Thermal Insulation EvaluationsChairman, Holometrix, Inc.Tennessee Technological University, CambridgeCookeville, MATN


    Paper ID: STP16338S

    Committee/Subcommittee: C16.21

    DOI: 10.1520/STP16338S


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