PROBLEM 4.15 KNOWN:Dimensions and boundary temperatures of a steam pipe embedded in a concrete asing. cFIND:Heat loss per unit length. SCHEMATIC:ASSUMPTIONS:(1) Steady-state conditions, (2) Negligible steam side convection resistance, pipe wall resistance and contact resistance (T1= 450K), (3) Constant properties. PROPERTIES:Table A-3, Concrete (300K): k = 1.4 W/m⋅K. ANALYSIS:The heat rate can be expressed as ()1-212qSk TSk TT=Δ=−From Table 4.1, the shape factor is
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