The wall of an furnace consists of three materials having, k₁ = 20 W/m. K and kc = 50 W/m. K, and known thickness, LA = 0.30 m and Lc= 0.15 m. The third material, B, which is sandwiched between materials A and C, LB 0.15 m. Under steady-state operating conditions, the outer, inner surface temperature and heat transfer coefficient is T5,0 = 20°C, T,i= 500 °C, and hi = 25 W/m². K. What is the value of kB? =

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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.