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A pipe of 25 mm outer diameter carries steam. The heat transfer coefficient between the cylinder and surroundings is 5 W/m2K. It is proposed to reduce the heat loss from the pipe by adding insulation having a thermal conductivity of 0.05 W/mK. Which one of the following statements is TRUE?
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- The outer radius of the pipe is equal to the critical radius.
- The outer radius of the pipe is less than the critical radius.
- Adding the insulation will reduce the heat loss.
- Adding the insulation will increase the heat loss.
Correct Option: C
Critical radius of insulation
| = |  |  | h |
| = | | | m | 5 |
(router) > rcritical
Thus, adding insulation shall decrease H.T. Rate.
