For a given ambient air temperature with increase in the thickness of insulation of a hot cylindrical pipe, the rate of heat loss from the surface would ?
Correct answer: D. First increase and then decrease
- A. Decrease
- B. Increase
- C. First decrease and then increase
- D. First increase and then decrease
Explanation
For a cylindrical pipe, adding insulation first increases the outer area and can increase heat loss until the critical insulation radius is reached. Beyond that radius, the added thermal resistance dominates and heat loss decreases.
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