1-98 Consider steady heat transfer between two large par- allel plates at constant temperatures of T = 290 K and T, = 150 K that are L = 2 cm apart. Assuming the surfaces to be black (emissivity & = 1), determine the rate of heat trans- fer between the plates per unit surface area assuming the gap between the plates is (a) filled with atmospheric air, (b) evacu- ated, (c) filled with fiberglass insulation, and (d) filled with superinsulation having an apparent thermal conductivity of 0.00015 W/m K. %3D
1-98 Consider steady heat transfer between two large par- allel plates at constant temperatures of T = 290 K and T, = 150 K that are L = 2 cm apart. Assuming the surfaces to be black (emissivity & = 1), determine the rate of heat trans- fer between the plates per unit surface area assuming the gap between the plates is (a) filled with atmospheric air, (b) evacu- ated, (c) filled with fiberglass insulation, and (d) filled with superinsulation having an apparent thermal conductivity of 0.00015 W/m K. %3D
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Transcribed Image Text:1-98 Consider steady heat transfer between two large par-
allel plates at constant temperatures of T, = 290 K and
T, = 150 K that are L = 2 cm apart. Assuming the surfaces to
be black (emissivity & = 1), determine the rate of heat trans-
fer between the plates per unit surface area assuming the gap
between the plates is (a) filled with atmospheric air, (b) evacu-
ated, (c) filled with fiberglass insulation, and (d) filled with
superinsulation having an apparent thermal conductivity of
0.00015 W/m-K.
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