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MMLU-Pro / 11533 / Air is flowing over a 5-row tube bank. The air enters the enclosing duct at a…

Problem

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

question

Air is flowing over a 5-row tube bank. The air enters the enclosing duct at a temperature of 60°F, and it leaves at 100°F. The air flow is 500 ft^3/min, and is at atmospheric pressure. The tubes have a diameter of 1 in. and a length of 4 ft. They are staggered, with the longitudinal and transverse spacing ratio of Z. The outside wall surface temperature is 227°F. If the minimum free flow cross-sectional area is 1.667 ft^2, calculate the coefficient of heat transfer. Table 1: Ratio of mean heat-transfer coefficient for bank of tubes N rows deep to the coefficient for tubes in a single row. N 1 2 3 4 5 6 7 8 9 10 Triangular grid 1 1.10 1.22 1.31 1.35 1.40 1.42 1.44 1.46 1.47 Square grid 1 1.25 1.36 1.41 1.44 1.47 1.50 1.53 1.55 1.56

category

engineering

options

  1. 5.83 Btu/hr-ft^2-°F
  2. 7.062 Btu/hr-ft^2-°F
  3. 4.58 Btu/hr-ft^2-°F
  4. 6.49 Btu/hr-ft^2-°F

src

stemez-HeatTransfer

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Source and history

upstream_id / Original problem ID
11533
task_id
bc502a4c-8fcf-52c5-8a4b-b65e60ade3e0
task_key
default--test--11533
task_revision_id
1
config / split
default / test

Official source

initial import