The composite wall of an oven consists of three materials, two of which has known thermal conductivity, kA = 40 W/m.K and kc = 30 W/m.K. The third material, B, sandwiched between these two has an unknown thermal conductivity kB. The thickness of the materials LA = 0.2 m, LB = Lc = 0.1 m. Under steady-state operating conditions, measurements reveal an outer surface temperature Tso = 40°C, an inner surface temperature Ts,i= 550°C, and oven air temperature T. = 700°C. The inside convection coefficient h 25 W/m.K. (a) Draw the thermal circuit and temperature profile across the wall. (b) Determine the heat flux through the wall. (c) Find the value of kg. %3D %3D S,0

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.