Modelling supply-air window in a building simulation code

The concept of a supply-air window is to allow air renewal circulating between glasses before entering inwards. Based on this principle, a part of heat transfer through the glasses is recovered by air renewal. Actually, the way to consider it in a building simulation code is not satisfactory. This article proposes a model that can be implemented easily in many building simulation codes. This model is based on the analytical solution of the problem of air circulating between isotherm panes differentially heated. It has been implemented in Buildings library of Modelica. Short wave radiation is considered by using the equation of Window software. Long wave radiation is considered using radiosity model. A special attention is taken to consider convective heat transfer coefficient between air space and glasses. The results obtained are compared to those of a commercial computational fluid dynamics (CFD) code (Fluent).