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The heat is transferred from the hot gases of combustion to the inner surface of chamber by convection and radiation simultaneously and at outer surface by convection to the atmosphere as shown in figure.
Given data: h = 10 W/m2K, K= 20 W/m2K, σ = 5.67×10-8 W/m2K4, T1 = 200 0C, Ts1 = 1800C, Ts2 = 1500C, T2 = 1200C

The thermal resistance per m2 is
  • a)
     0.85 0C /m2W
  • b)
    0.196 0C /m2W
  • c)
     0.21 0C /m2W
  • d)
    0.75 0C /m2W
Correct answer is option 'B'. Can you explain this answer?
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The heat is transferred from the hot gases of combustion to the inner ...
The physical configuration is shown in figure.


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The heat is transferred from the hot gases of combustion to the inner surface of chamber by convection and radiation simultaneously and at outer surface by convection to the atmosphere as shown in figure.Given data: h = 10 W/m2K, K= 20 W/m2K,σ= 5.67×10-8W/m2K4, T1= 200 0C, Ts1= 1800C, Ts2= 1500C, T2= 1200CThe thermal resistance per m2isa)0.85 0C/m2Wb)0.1960C/m2Wc)0.210C/m2Wd)0.750C/m2WCorrect answer is option 'B'. Can you explain this answer?
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