Thermodynamics HW Solutions 243

Thermodynamics HW Solutions 243 - Table 3-5 to be m 078 . 9...

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Chapter 3 Steady Heat Conduction 3-124 Hot and cold water pipes run parallel to each other in a thick concrete layer. The rate of heat transfer between the pipes is to be determined. Assumptions 1 Steady operating conditions exist. 2 Heat transfer is two-dimensional (no change in the axial direction). 3 Thermal conductivity of the concrete is constant. Properties The thermal conductivity of concrete is given to be k = 0.75 W/m °C. Analysis The shape factor for this configuration is given in
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Unformatted text preview: Table 3-5 to be m 078 . 9 ) m 05 . )( m 05 . ( 2 ) m 05 . ( ) m 05 . ( ) m 4 . ( 4 cosh ) m 8 ( 2 2 4 cosh 2 2 2 2 1 2 1 2 2 2 1 2 1 = = = D D D D z L S T 2 = 15 C D = 5 cm T 1 = 60 C L = 8 m z = 40 cm Then the steady rate of heat transfer between the pipes becomes W 306 = = = C ) 15 60 )( C W/m. 75 . )( m 078 . 9 ( ) ( 2 1 T T Sk Q & 3-86...
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This note was uploaded on 01/19/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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