1.22. A plane wall 0.15 cm thick, of a homogeneous material with k = 0.40 W/m- K, has steady and uniform temperatures T,- 20 °C and T- 70 C (sce Fig 1-6). Determine the heat transfer rate in the positive r-direction per square meter of surface area Ans -133 W/m

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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.