3. Nanotechnologies and nanomaterials for functionalized buildings

3.1 Nanostructured superinsulating envelope

The first lever that can be used to limit unwanted heat transfer is, of course, the thermal conductivity λ of the materials used in the building envelope. This property is defined on the basis of Fourier's law relating heat flux density, i.e. the amount of heat passing per second through a one-square-meter section of the material, Q(J.m ^–2 .s ^–1 ), to the temperature gradient dT / dz (K.m ^–1 ) across this...