Topic: Heat Transfer
Critical thickness rate from a yields
- A. No heat transfer rate from a pipe
- B. Minimum heat transfer rate from a pipe
- C. Maximum heat transfer rate from a pipe
- D. None of the above
Answer: C. Maximum heat transfer rate from a pipe
Explanation: Critical thickness of insulation is the specific radius up to which adding insulation actually increases the heat transfer rate. This happens because the decrease in convective resistance (due to increased outer surface area) outweighs the increase in conductive resistance. At exactly the critical thickness, the heat transfer rate from a pipe reaches its maximum.