DSF performance exchanging skins

This study defines a computational algorithm to calculate and evaluate thermal performances of a double skin façade (DSF). The definition of the algorithm, expressed in the unit Simulink of Matlab, has been obtained through: the physical-mathematical treatment of the air stream model and the thermal model; the solution of differential equations through the routine writing in Simulink; the simulations to evaluate the constructive parameters of DSF. The first simulations have been made in order to evaluate the ideal depth of a single cell of DSF [Lembo et al.2007], placing a single tempered glass on the outer skin and a double glazing filled with argon on the interior skin. In the new simulations the outside glazing has been exchanged for the internal double glazing (that is placing double glazing filled with argon on the outer skin and a single tempered glass on the interior skin). Analysing results we can say that efficiency of preheating η has increased up to 5.6% in winter, while solar factor g has increased up to 70% in summer. Simulations has just demonstrated that we have no improvement changing the position of glazing with respect to the first simulations because the solar factor g increases a lot and the efficiency of preheating η increases a little.