  Positive buildings in energy are, nowadays, a recurrent objective of many
researches in the construction and energetic efficiency domain. Furthermore, to
achieve this objective, some studies about active and reactive walls have been
carried out employing porous medium as a main structure. Nevertheless, transfer
characterization in a foam type sample is not fully understood. The goal of
this study is to improve the characterization of heat transfer in isotropic and
anisotropic configurations of a porous medium. Thus, a finite volume method was
implemented to study a heat transfer through these media, in the interest of
achieving their ratio equivalent to fluid thermal conductivity (i.e. Nusselt
number). Finally, the results indicate a notable influence of the ratio of the
contact and the total inlet area on the isotropic configuration as well as
strong influence given by the different axis on the anisotropic model.
Moreover, the analysis shows that in an active wall constituted by two solid
phases, these effects will be preponderant for their characterization.
