At the Faculty of Civil Engineering, University of Ljubljana the senior year students attend course on bioclimatic design of buildings. In the academic year 2006/2007 they carried out a joint study [1] dealing with interaction among daylight levels and heating energy demand of their buildings in relation to properties of the applied glazing. Students also discussed the concept of passive house in relation to inside environment quality and compared the passive and the bioclimatic concepts. In the case of 27 student-selected buildings calculations showed that change from double to triple window glazing resulted in average reduction of specific heating energy demand (Q_n/A_u) by 14.4%. The same intervention at the same building configuration resulted in reduction of average illuminance level (Eav-eq) by immense 25.3%. Very similar results were obtained in an independent parallel study [2] carried out by the staff of Chair for Buildings and Constructional Complexes (KSKE).
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