Thermodynamics HW Solutions 248

Thermodynamics HW Solutions 248 - be k = 1.4 W/m C....

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Chapter 3 Steady Heat Conduction 3-131 A spherical tank containing some radioactive material is buried in the ground. The tank and the ground surface are maintained at specified temperatures. The rate of heat transfer from the tank 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 ground is constant. Properties The thermal conductivity of the ground is given to
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Unformatted text preview: be k = 1.4 W/m C. Analysis The shape factor for this configuration is given in Table 3-5 to be T 2 =15 C T 1 = 140 C z = 5.5 m D = 3 m S D D z = = = 2 1 0 25 2 3 1 0 25 3 55 2183 . ( ) . . . m m m m Then the steady rate of heat transfer from the tank becomes W 3820 = = = C ) 15 140 )( C W/m. 4 . 1 )( m 83 . 21 ( ) ( 2 1 T T Sk Q & 3-91...
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