Modeling of the double-skin facades for building energysimulations: radiative and convective heat transfer

A comprehensive modeling of radiative and convective heat transfer of a compact double-skin facade equipped with venetian blind is proposed here. Results from detailed CFD model were used in order to compute convective heat transfer coefficients and the radiation heat transfer, parts of energy balances of the proposed nodal model. The convective heat transfer coefficients found were weak and only little influenced by slat tilt angles and solar radiation. On the opposite the slat tilt angle effect on radiative heat transfer is very important, since it regulates the solar radiation transmitted to the inside.