3. Consider steady heat transfer between two large parallel plates at constant temperatures T1 = 300 K and T2 = 200 K that are L = 1 cm apart, as shown below. Assuming the surface to be black, determine the rate of heat transfer between the plates per unit surface area assuming the gap between the plates is a) filled with still air with k = 0.0219 W/m°C, b) free flowing air with h = 7.5 W/m2°C, c) evacuated, d) filled with urethane insulation with k = 0.026 W/m°C, and e) filled with superinsulation that has an apparent thermal conductivity k = %3D 0.00002 W/m°C T, = 300 K T, = 200 K L = 1 cm `ɛ = 1

3. Consider steady heat transfer between two large parallel plates at constant temperatures T1 = 300 K and T2 = 200 K that are L = 1 cm apart, as shown below. Assuming the surface to be black, determine the rate of heat transfer between the plates per unit surface area assuming the gap between the plates is a) filled with still air with k = 0.0219 W/m°C, b) free flowing air with h = 7.5 W/m2°C, c) evacuated, d) filled with urethane insulation with k = 0.026 W/m°C, and e) filled with superinsulation that has an apparent thermal conductivity k = %3D 0.00002 W/m°C T, = 300 K T, = 200 K L = 1 cm `ɛ = 1

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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3. Consider steady heat transfer between two large parallel plates at constant
temperatures T1 = 300 K and T2 = 200 K that are L = 1 cm apart, as shown
below. Assuming the surface to be black, determine the rate of heat transfer
between the plates per unit surface area assuming the gap between the plates is
a) filled with still air with k = 0.0219 W/m°C, b) free flowing air with h = 7.5
W/m2°C, c) evacuated, d) filled with urethane insulation with k = 0.026 W/m°C,
and e) filled with superinsulation that has an apparent thermal conductivity k =
%3D
0.00002 W/m°C
T, = 300 K
T, = 200 K
L = 1 cm
ɛ = 1'

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