A batt of glass fiber insulation is of density = 28 kg/m³. Determine the maximum and minimum possible values of the effective thermal conductivity of the insulation at T = 300 K, and compare with the value reported in Table A.3.

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TABLE A.3 Thermophysical Properties of Common Materials" Structural Building Materials Description/Composition Building Boards Asbestos-cement board Gypsum or plaster board Plywood Sheathing, regular density Acoustic tile Hardboard, siding Hardboard, high density Particle board, low density Particle board, high density Woods Hardwoods (oak, maple) Softwoods (fir, pine) Masonry Materials Cement mortar Brick, common Brick, face Clay tile, hollow 1 cell deep, 10 cm thick 3 cells deep, 30 cm thick Concrete block, 3 oval cores Sand/gravel, 20 cm thick Cinder aggregate, 20 cm thick Concrete block, rectangular core 2 cores, 20 cm thick, 16 kg Same with filled cores Plastering Materials Cement plaster, sand aggregate Gypsum plaster, sand aggregate Gypsum plaster, vermiculite aggregate Density, P (kg/m³) 1920 800 545 290 290 640 1010 590 1000 720 510 1860 1920 2083 11 | | | | 1860 1680 720 Typical Properties at 300 K Thermal Conductivity, k (W/m.K) 0.58 0.17 0.12 0.055 0.058 0.094 0.15 0.078 0.170 0.16 0.12 0.72 0.72 1.3 0.52 0.69 1.0 0.67 1.1 0.60 0.72 0.22 0.25 Specic Heat, c, (J/kg-K) 1215 1300 1340 1170 1380 1300 1300 1255 1380 780 835 1085