Problem
:
A cryogenic flui
d is flowing in a
304 SS
pipe.
The pipe is insulated
on its outside surface
with
6
-
mm thick,
evacuated,
aluminum foil/glass mat insulation.
(“Evacuated” means a partial vacuum is drawn on the
insulation to
remove air that would otherwise fill
pores inside the insulation.)
The pipe
inside diameter
is 127 mm; it’s outside diameter is 138 mm.
The
fluid temperature is
-
173
o
C
.
T
he
air temperature
outside the pipe is 27
o
C and the temperature of the
surrounding
room
walls
is also 27
o
C.
The thermal
condu
ctivity of
304 SS
is
9.5
W/m
-
K
at the expected pipe wall temperature
;
the conductivity of the
in
sulation is 0.00016 W/m
-
K
(yes, 0.00016!)
at the expected average temperature of the insulation .
The forced convective heat transfer coefficient between the cryogenic fluid and inside surface of the pipe is
123 W/m2-K, the natural convective heat transfer coefficient between the outside surface of the insulation and outside air is 9.7 W/m
2-K and the radiative heat transfer coefficient between the outside surface of the insulation and room walls is 1.2 W/m
2-K. Assume thermal contact resistance between the pipe and insulation is negligible.
A.Calculate the heat transfer rate per unit length of pipe between the outside of the insulated
pipe and cryogenic fluid.
B.Determine the temperature of the outside surface of the pipe.
C.What 2 design features of the insulation result in its low thermal conductivity (high insulating effectiveness)?
Problem : A cryogenic flui d is flowing in a 304 SS pipe. The pipe is...
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