The paper explain the thermal conductivity expressions, in stationary regime, in plane, tubular and spherical, laminated composite structures, with intimate connections between layers, having defects, too. We take into account the volumes of the composite components, on the one hand, and those of the materials and fluids, contained in the defects area, on the other hand. In the corresponding relations the influences of some additional layers, representing protections or deposits during operation, are attached.
