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Heat Transfer Miscellaneous
  1. If a foam insulation is added to a 4 cm outer diameter pipe as shown in the figure, the critical radius of insulation (in cm) is ________.
    1. 3 cm
    2. 2 cm
    3. 5 cm
    4. 4 cm
Correct Option: C

Kfoam = 0.1
W
mK

h0 = 2
W
m²K

Critical radius, rc =
Kfoam
for a pipe
h0

=
0.1
 = 0.05 m = 5 cm
2


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