Double skin facade has great effect on building energy demand. In this research, a single skin and a double skin office building's heat loss were compared to show the double skin's effect on building energy demand. Double skin facade in office building has not been applied in Istanbul and that is why this research aims to show the basic effects of double skin facade, if it would be applied. A new method is used in double skin facade's heat loss calculation The method is formed of a modified step, which is the modification of the method developed by B. Todorovic, and an additional step for the time dependent heat transfer calculations. In the first step, inter-space temperature calculated. In the second step, inter-space temperatures, which is calculated in the previous step, are assumed as outdoor temperature and heat transfer through inner skin's components calculated in unsteady condition. Temperature estimation method here is adapted to the heat loss of step-by-step hourly calculation. The new method developed in the research is applied on an office building in Istanbul assuming that it would be renovated with double skin facade. Calculations have been made for the average climatic conditions of January, which is representing winter period in Istanbul. According to results of this application study single skin office building's heat loss is 40% is higher than that of double skin office building.
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