C ONCLUSION Space heating dominates in case of double and triple windows, the proportion of heating reduces as no of panes increases Smaller windows result in better energy efficiency in case of double and triple glazing Financially most feasible case is triple glazing with high thermal resistance (U=0.54 g=0.49), window to wall ratio ca 25%, insulation thickness 200 mm (U=0.16) Best energy efficiency was achieved with quintuple glazing (U=0.21 g=0.24), window to wall ratio 60%, insulation thickness 390 mm (U=0.09) In case of quadruple glazing (U=0.32 g=0.36) the optimal window to wall ratio is ca 40% External shading is not necessary if windows are sized according to average daylight factor 2% It is more reasonable to use cost optimal facade solution and install more PV panels Necessity to study the influence of external shading control strategies and double facade on energy efficiency occurred
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