Consider steady heat transfer between two large parallel plates at constant temperature                     of T1 = 500K and  T2 =300K that are L =2 cm apart. Assuming the surfaces to be black                                   ( emissivity Ɛ = 1 ), determine the rate  of heat transfer between the plates per unit surface                     area assuming the gap between the plate   filled with atmospheric air,                   (b) evacuated,              (c) filled with fiberglass insulation, and

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
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Chapter11: Heat Transfer By Radiation
Section: Chapter Questions
Problem 11.32P
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Consider steady heat transfer between two large parallel plates at constant temperature

 

                  of T1 = 500K and  T2 =300K that are L =2 cm apart. Assuming the surfaces to be black

               

                  ( emissivity Ɛ = 1 ), determine the rate  of heat transfer between the plates per unit surface

 

                  area assuming the gap between the plate

 

  • filled with atmospheric air,

      

           (b) evacuated,

 

           (c) filled with fiberglass insulation, and

 

           (d) filled with superinsulation having an apparent thermal conductivity of 0.00015 W/m.˚C.

 

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