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Question

It is planned to insulated the shell of a heat exchanger. The outside diameter of the shell is 30cm, its outer surface temperature is at 280C and it may be assumed to be remains constant even after applying insulation on the shell.

If the outside surface heat transfer coefficient is 2, what is the maximum thermal conductivity of insulating material for effectively reducing heat transfer from shell

A
0.3
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B
0.24
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C
1.2
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D
2.4
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Solution

The correct option is A 0.3
kinsh=rckins=rc×h=0.15×2=0.3 W/mK

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