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    Transient Coupled Conduction and Radiation Heat Transfer Through Ceiling Fiberglass/Gypsum Board Composite

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    The heat transfer phenomenon in a fiberglass insulation and gypsum board (sheetrock) composite was investigated numerically. Heat transfer through the fiberglass insulation was taken to occur by coupled conduction and volumetric radiation. The fiberglass insulation was considered as a radiatively absorbing, emitting, and scattering medium. Heat transfer within the gypsum board was taken to be by conduction only. Measured (transient) temperatures at the top of the fiberglass insulation and on the bottom of the gypsum board were used as boundary condition information in obtaining a numerical solution. These temperatures were measured in a residential attic for summer and winter climatic conditions. For purposes of minimizing heat loss in winter and heat gain in summer, two different configurations of fiberglass insulation were studied. One configuration was a standard R-19 [15 cm (6 in.) thick] fiberglass batt; the other configuration was a standard R-19 fiberglass batt with a foil radiant barrier installed on top of the insulation. It was found that the batt with the foil radiant barrier reduced the heat gain in summer by about 45% and reduced the heat loss in winter by about 13%.


    transient heat transfer, fiberglass, attic, radiation, conduction, insulation

    Author Information:

    Yeh, HY
    University of MississippiEMRO, ITRI, University, MS

    Roux, JA
    University of MississippiEMRO, ITRI, University, MS

    Committee/Subcommittee: C16.21

    DOI: 10.1520/STP23329S