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MMLU-Pro / 11705 / Compute the rate of heat loss per unit area from a circular hotair duct (a) by…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

Compute the rate of heat loss per unit area from a circular hotair duct (a) by convection and (b) by simultaneous convectionand radiation. Assume the duct has a diameter of 3 ft. and is made of a polished metal (emissivity \epsilon = 0.1). The surfacetemperature of the metal is 150°F, and the ambient temperatureis 65°F. (c) Repeat part (b), assuming the metal ispainted white on the outside (\epsilon = 0.95).

category

engineering

options

  1. 82.3 Btu/ft^2-hr, 92.0 Btu/ft^2-hr, 185.4 Btu/ft^2-hr
  2. 84.6 Btu/ft^2-hr, 95.2 Btu/ft^2-hr, 190.9 Btu/ft^2-hr
  3. 65.9 Btu/ft^2-hr, 75.6 Btu/ft^2-hr, 155.7 Btu/ft^2-hr
  4. 68.7 Btu/ft^2-hr, 78.9 Btu/ft^2-hr, 160.6 Btu/ft^2-hr
  5. 72.5 Btu/ft^2-hr, 82.8 Btu/ft^2-hr, 165.3 Btu/ft^2-hr
  6. 77.4 Btu/ft^2-hr, 88.1 Btu/ft^2-hr, 179.2 Btu/ft^2-hr
  7. 79.2 Btu/ft^2-hr, 89.5 Btu/ft^2-hr, 174.8 Btu/ft^2-hr
  8. 70.4 Btu/ft^2-hr, 80.1 Btu/ft^2-hr, 170.2 Btu/ft^2-hr
  9. 75.4 Btu/ft^2-hr, 85.1 Btu/ft^2-hr, 175.2 Btu/ft^2-hr
  10. 80.7 Btu/ft^2-hr, 90.3 Btu/ft^2-hr, 180.5 Btu/ft^2-hr

src

stemez-HeatTransfer

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Source and history

upstream_id / Original problem ID
11705
task_id
81d728fc-5fa9-564e-bdb6-490336dbf13b
task_key
default--test--11705
task_revision_id
1
config / split
default / test

Official source

initial import