Consider steady heat transfer between two large parallel plates at constant peratures of T1= 290 K and 72 = 150 K that are L= 2 cm apart. Assuming the faces to be black (emissivity 1), determine the rate of heat transfer between the tes per unit surface area, assuming the gap between the plates is (a) filled with nospheric air k = 0.01979 W/m °C, (b) evacuated, (c) filled with fiberglass ulation and k = 0.036 W/m-°C, and (d) filled with superinsulation having an parent thermal conductivity of 0.00015 W/m. °C

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Chapter11: Heat Transfer By Radiation
Section: Chapter Questions
Problem 11.32P
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Consider steady heat transfer between two large parallel plates at constant
temperatures of T1= 290 K and 72 150 K that are L= 2 cm apart. Assuming the
surfaces to be black (emissivity 1), determine the rate of heat transfer between the
plates per unit surface area, assuming the gap between the plates is (a) filled with
atmospheric air k = 0.01979 W/m °C, (b) evacuated, (c) filled with fiberglass
insulation and k = 0.036 W/m-°C, and (d) filled with superinsulation having an
apparent thermal conductivity of 0.00015 W/m. °C
=
Transcribed Image Text:Consider steady heat transfer between two large parallel plates at constant temperatures of T1= 290 K and 72 150 K that are L= 2 cm apart. Assuming the surfaces to be black (emissivity 1), determine the rate of heat transfer between the plates per unit surface area, assuming the gap between the plates is (a) filled with atmospheric air k = 0.01979 W/m °C, (b) evacuated, (c) filled with fiberglass insulation and k = 0.036 W/m-°C, and (d) filled with superinsulation having an apparent thermal conductivity of 0.00015 W/m. °C =
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