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Determine the radiant heat exchange in W/m2 between two large parallel steel plates of Emissivity 0.8 and 0.5 held at temperatures of 1000 K and 500 K, respectively, if a thin copper plate of Emissivity 0.1 is introduced as a radiation shield between the two plates.  
s = 5.67 × 10–8 W/m2. K4.    

            

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