A 1.2 m wide and 5.1 m long solar collector is mounted to a roof.  Now the average surface temperature of the solar collector is measured to be 50 oC.  The effective surrounding sky temperature is 8 oC.  If the emissivity of the collector is 0.88,  determine the rate of heat transfer from the collector to the surroundings due to radiation.

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.
Chapter2: Steady Heat Conduction
Section: Chapter Questions
Problem 2.61P
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A 1.2 m wide and 5.1 m long solar collector is mounted to a roof.  Now the average surface temperature of the solar collector is measured to be 50 oC.  The effective surrounding sky temperature is 8 oC.  If the emissivity of the collector is 0.88,  determine the rate of heat transfer from the collector to the surroundings due to radiation.

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Step 1

Given

width of solar collector w=1.2 m

Length of solar collector l=5.1 m

Average surface temperature of solar collector Tavg=50°C323 K

Surrounding temperature T=8°C281 K

Emissivity  ϵ=0.88

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