A vertical cylinder 6 ft tall and 1 ft in diameter might be used to approximate a man for heat-transfer purposes. Suppose the surface temperature of the cylinder is 78°F, h=2 Btu/h · ft2 . °F, the surface emissivity is 0.9, and the cylinder is placed in a large room where the air temperature is 68°F and the wall temperature is 45°F. Calculate the heat lost from the cylinder. Repeat for a wall temperature of 80°F. What do you conclude from these calculations?
A vertical cylinder 6 ft tall and 1 ft in diameter might be used to approximate a man for heat-transfer purposes. Suppose the surface temperature of the cylinder is 78°F, h=2 Btu/h · ft2 . °F, the surface emissivity is 0.9, and the cylinder is placed in a large room where the air temperature is 68°F and the wall temperature is 45°F. Calculate the heat lost from the cylinder. Repeat for a wall temperature of 80°F. What do you conclude from these calculations?
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.68P
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![O A vertical cylinder 6 ft tall and 1 ft in diameter might be used to approximate a man
for heat-transfer purposes. Suppose the surface temperature of the cylinder is 78°F,
h=2 Btu/h - ft2 .°F, the surface emissivity is 0.9, and the cylinder is placed in a large
room where the air temperature is 68°F and the wall temperature is 45°F. Calculate
the heat lost from the cylinder. Repeat for a wall temperature of 80°F. What do you
conclude from these calculations?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F812bb759-aa59-446d-90cd-24fc22fe1b4d%2F07ac9061-f11d-49e9-930b-34704cf59a53%2F7tkoncv_processed.jpeg&w=3840&q=75)
Transcribed Image Text:O A vertical cylinder 6 ft tall and 1 ft in diameter might be used to approximate a man
for heat-transfer purposes. Suppose the surface temperature of the cylinder is 78°F,
h=2 Btu/h - ft2 .°F, the surface emissivity is 0.9, and the cylinder is placed in a large
room where the air temperature is 68°F and the wall temperature is 45°F. Calculate
the heat lost from the cylinder. Repeat for a wall temperature of 80°F. What do you
conclude from these calculations?
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