Engineering, 14.04.2020 23:01 runaway173

Convection ovens operate on the principle of inducing forced convection inside the oven chamber with a fan. A small cake is to be baked in an oven when the con- vection feature is disabled. For this situation, the free convection coefficient associated with the cake and its Steel sheet Concrete pad Ts, s Tb Ts Tsur Vs Pelec t s Lo ε Air T[infinity], h , 56 Chapter 1 ! Introduction CH001.qxd 2/24/11 12:03 PM Page 56 pan is hfr ! 3 W/m2 ! K. The oven air and wall are at temperatures T! ! Tsur ! 180)C. Determine the heat flux delivered to the cake pan and cake batter when they are initially inserted into the oven and are at a tem- perature of Ti ! 24)C. If the convection feature is acti- vated, the forced convection heat transfer coefficient is hfo ! 27 W/m2 ! K. What is the heat flux at the batter or pan surface when the oven is operated in the convection mode? Assume a value of 0.97 for the emissivity of the cake batter and pan.

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