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Mechanical Engineering QUESTION #2426
Question 1
The critical insulation radius for a cylindrical surface with insulation of conductivity \(k_{ins}\) and outer convection coefficient \(h\) is:
  • \(r_{cr} = k_{ins} \cdot h\)
  • \(r_{cr} = h / k_{ins}\)
  • \(r_{cr} = k_{ins} / h\)✔️
  • \(r_{cr} = \sqrt{k_{ins}/h}\)
Correct Answer Explanation
Critical insulation radius: \(r_{cr}=k_{ins}/h\). Adding insulation initially INCREASES heat loss if the pipe radius \(r_1