1.1 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 20-mm-thick sheet of the material is T₁ T₂ = 10°C. - (a) What is the heat flux through a 2 m × 2 m sheet of the insulation? (b) What is the rate of heat transfer through the sheet of insulation?

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