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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) Steadystate conditions, (2) Negligible steam side convection
resistance, pipe wall resistance and contact resistance (T
1
= 450K), (3) Constant properties.
P
ROPERTIES:
Table A3
, Concrete (300K):
k = 1.4 W/m
⋅
K.
A
NALYSIS:
The heat rate can be expressed as
()
12
1
2
qS
kT
S
kT T
=Δ =
−
F
rom Table 4.1, the shape factor is
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This note was uploaded on 12/07/2010 for the course MAE Heat Trans taught by Professor Lee,j.s. during the Spring '10 term at Seoul National.
 Spring '10
 LEE,J.S.
 Heat Transfer

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