A furnace wall lining is made up of material with k = 2.5 w/mk. the temperature of the inner and outer surface of this plane wall lining are 810'c and 330'c respectively. the outer surface is exposed to ambient air at 30'c with convective heat transfer coefficient = 10 W/m^2K calculate:
1. the rate of heat flow per unit area.
2. thickness of lining in the given situation.
3. thickness of lining if the heat flow rate is to be reduced by 50%.
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