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MMLU-Pro / 11800 / A copper pipe (1 in. O.D., 0.88 in. I.D. and k = 220 Btu/hr-ft-°F) carries…

Problem

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question

A copper pipe (1 in. O.D., 0.88 in. I.D. and k = 220 Btu/hr-ft-°F) carries process steam 212°F through a room at 60°F. The heating cost of steam is 0.05 cents/ Btu. The pipe is insulated with 85% magnesia (0.57 in. thick and k = 0.038 Btu/hr-ft-°F) at a cost of $3.25 per foot. Estimate the payback period of insulation cost. Assume a constant fluid film resistance (0.95 hr-ft-°F/Btu) and neglect outer surface film resistance.

category

engineering

options

  1. 65 hours
  2. 77 hours
  3. 70 hours
  4. 52 hours
  5. 84 hours
  6. 48 hours
  7. 58 hours
  8. 75 hours
  9. 61 hours
  10. 90 hours

src

stemez-TransportPhenomena

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Source and history

upstream_id / Original problem ID
11800
task_id
04e7351c-6a0c-5508-9fee-9219e7fd6443
task_key
default--test--11800
task_revision_id
1
config / split
default / test

Official source

initial import