lecture22_2011 - Two-Surface Enclosures Two-Surface...

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5/1/2011 1 1 Lecture no 22 Two-Surface Enclosures Two-Surface Enclosures • Simplest enclosure for which radiation exchange is exclusively between two surfaces and a single expression for the rate of radiation transfer may be inferred from a network representation of the exchange. 44 12 1 2 11 2 2 2 1 TT qq q A AF A     From heat transfer by Cengel 2 Lecture no 22 Radiation Effect on Temperature Measurements A thermocouple used to measure the temperature of hot air flowing in a duct whose walls are maintained at Tw =400 K shows a temperature reading of T th=650 K . Assuming the emissivity of the thermocouple junction to be 0.6 and the convection heat transfer coefficient to be h = 80 W/m2 · K, determine the actual temperature of the air. From heat transfer by Cengel
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5/1/2011 2 3 Lecture no 22 Radiation Shield (cont) • Radiation Network: 44 12 12 1 2 31 32 11 3 3 13 3 2 3 33 2 2 2 ,, TT qq q A AF A A A      4
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This note was uploaded on 05/18/2011 for the course MEEG 342 taught by Professor Staff during the Spring '08 term at University of Delaware.

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lecture22_2011 - Two-Surface Enclosures Two-Surface...

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