The advantage and shortcoming of anisotropic material of thermal conductivity using as building envelope
were analyzed in this paper. The thermal performance of anisotropic material of thermal conductivity was presented by rotating
the original rectangular axes so as to determine the principal axes and make the cross-derivative terms disappear.
The results indicated that the heat flux vector is commonly not perpendicular to the isothermal surface in anisotropic material.
Double skin facade has been successfully applied in many building designs. The application of laminated composite
with anisotropic thermal conductivity in double skin envelope was proposed to avoid its disadvantage. The interior envelope
in double skin system may be made of laminated glaze or other laminated materials. Basing on the combination of
anisotropic material and double skin envelope, the indoor cooling and heating load decrease in summer and winter respectively
while the anisotropic material was used as interior building envelope. Especially in summer, the effect of energy
saving is obvious since the partial magnitude of conductive heat in the interior envelope could be brought out from the
cavity by natural ventilation through it.