The thermal conductivity of a sheet of rigid, extruded insulation is reported to be k = 0.029 W/m·K. The measured temperature difference across a 25-mm-thick sheet of the material is T| – T2 = 10°C. (a) What is the heat flux through a 3 m x 3 m sheet of the insulation, in W/m2? (b) What is the rate of heat transfer through the sheet of insulation, in W? (c) What is the thermal resistance of the sheet due to conduction, 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.