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Estimating thermal effect of so called double-skin façades on energy   performance of buildings with two envelopes, a proprietary mathematical model   of heat transfer through double-skin façades has been developed. A very   specific approach of the mathematical model presented here is based on   prediction of the double-skin façades interspace temperature and assumption   that façade could be treated as a single one declaring the interspace   temperature and reduced intensity of solar radiation as the “outdoor”   conditions. In this paper results of the heating and cooling loads as well as   the interspace temperature prediction compared for three months (January,   April and July) and for the west oriented façade with ordinary and absorption   glass are presented. Façade is placed under climatic conditions of Belgrade   (45° North Latitude). Also, results for weather conditions of sunny and   cloudy day are shown. Results includes influence of air velocity in   interspace of façades for April and July. Following a type of the double-skin   façade construction assumption it was implied that the space between the two   envelopes is closed during the winter mode for air circulation, in order to   have temperature higher inside than outside and opposite in the summer mode,   air inlet and outlet are opened in order to prevent much higher temperatures   than the outside ones, and higher cooling load of an air-conditioned   building, as a consequence. Taking only thermal effects into account,   presented prediction has proven that double-skin façades decrease both   building heat losses and heat gains throughout the year, and give significant   contribution to the building energy consumption savings

The development of simple calculation model for energy performance of double skin façades