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problem4-15 - PROBLEM 4.15 KNOWN Dimensions and boundary...

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PROBLEM 4.15 KNOWN: Dimensions and boundary temperatures of a steam pipe embedded in a concrete asing. c F IND: Heat loss per unit length. SCHEMATIC: ASSUMPTIONS: (1) Steady-state conditions, (2) Negligible steam side convection resistance, pipe wall resistance and contact resistance (T 1 = 450K), (3) Constant properties. P ROPERTIES: Table A-3 , Concrete (300K): k = 1.4 W/m K. A NALYSIS: The heat rate can be expressed as ( ) 1-2 1 2 q Sk T Sk T T = Δ = F rom Table 4.1, the shape factor is
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