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MMLU-Pro / 11563 / A cast iron pipe of 4 in. inside diameter and 4.5 in. outside diameter is…

Problem

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question

A cast iron pipe of 4 in. inside diameter and 4.5 in. outside diameter is insulated with 3/4 in. layer of glass wool. The inside surface of the pipe is at 400°F and the glass wool outer surface is at 90°F. Determine the steady state heat transfer rate per foot length of the pipe. The thermal conductivity of the material of the pipe is 30 Btu/hr-ft-°F and that of the glass wool is 0.032 Btu/hr-ft-°F.

category

engineering

options

  1. 220.5 Btu/hr-ft
  2. 190.22 Btu/hr-ft
  3. 216.56 Btu/hr-ft
  4. 200 Btu/hr-ft
  5. 205.75 Btu/hr-ft
  6. 230 Btu/hr-ft
  7. 235 Btu/hr-ft
  8. 250 Btu/hr-ft
  9. 175 Btu/hr-ft
  10. 180 Btu/hr-ft

src

stemez-TransportPhenomena

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