The wall of a cold room consists of a layer of cork sandwiched between outer and inner walls of wood, the wood walls being each 30 mm thick. The inside atmosphere of the room is maintained at -20 °C when the external atmospheric temperature is 25 °C, the heat loss through the wall is 42 W/m2. Taking the thermal conductivity of wood and cork as 0.20 W/m-K and 0.05 W/m-K respectively, and the rate of heat transfer between each exposed wood surface and their respective atmospheres as 15 W/m2-K, calculate the thickness of the cork. (mm)

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Q: and k =43 W/m-K, respectively. The time required for the rod to reach 300 °C is seconds.

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Q: A. The Heat Flow B. Conductive resistance

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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.