Two cylinders, 0.75 m in diameter (upper cylinder is 1.5 m long, k = 0.5 W/m-K; lower cylinder is 1.1 m long, k = 1.3 W/m-K) are inside a frustum of a square pyramid (k = 0.053 W/m-K) as shown in the diagram. The upper face is at 250 oC and the lower base is at 100 oC. Calculate the resistance in A (in K/W).

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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.