Consider the oven of 1.54. The walls of the oven consist
Chapter , Problem 3.17(choose chapter or problem)
Consider the oven of 1.54. The walls of the oven consist of L 30-mm-thick layers of insulation characterized by kins 0.03 W/m K that are sandwiched between two thin layers of sheet metal. The exterior surface of the oven is exposed to air at 23 C with hext 2 W/m2 K. The interior oven air temperature is 180 C. Neglecting radiation heat transfer, determine the steady-state heat flux through the oven walls when the convection mode is disabled and the free convection coefficient at the inner oven surface is hfr 3 W/m2 K. Determine the heat flux through the oven walls when the convection mode is activated, in which case the forced convection coefficient at the inner oven surface is hfo 27 W/m2 K. Does operation of the oven in its convection mode result in signifi- cantly increased heat losses from the oven to the kitchen? Would your conclusion change if radiation were included in your analysis?
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