Thermodynamics HW Solutions 918

# Thermodynamics HW Solutions 918 - The emissivities ε of...

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Chapter 12 Radiation Heat Transfer 12-26 Two very large parallel plates are maintained at uniform temperatures. The net rate of radiation heat transfer between the two plates is to be determined. T 2 = 400 K ε 2 = 0.9 T 1 = 600 K ε 1 = 0.5 Assumptions 1 Steady operating conditions exist 2 The surfaces are opaque, diffuse, and gray. 3 Convection heat transfer is not considered. Properties
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Unformatted text preview: The emissivities ε of the plates are given to be 0.5 and 0.9. Analysis The net rate of radiation heat transfer between the two surfaces per unit area of the plates is determined directly from 2 W/m 2795 = − + − ⋅ × = − + − = − 1 9 . 1 5 . 1 ] ) K 400 ( ) K 600 )[( K W/m 10 67 . 5 ( 1 1 1 ) ( 4 4 4 2 8 2 1 4 2 4 1 12 εε σ T T A Q s & 12-15...
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## This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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