Role of Glazing for Zero Energy Buildings

An important part of the energy consumption in our country is in building sector. For this reason, energy efficiency measures in buildings must be implemented both in new buildings and in renovations. In the current debate, concepts such as “Green Building” and “Nearly Zero Energy Building” basicly covers efficient use of energy and usage of renewable energy sources in building energy modeling. In general, “Nearly Zero Energy Building”;

  • consumes minimum energy due to well insulated building envelope,

  • is designed with minimum solar heat gain components while providing maximum benefit from daylight,

  • has coated glass in its window systems that provides energy efficiency,

  • has solar collectors and photovoltaic panels that are used for hot water and electricity production


The target in “Zero Energy Building” is to reach almost zero annual energy consumption.

Developing architectural trends highlights much more use of "glass" in building designs. Therefore, in " Nearly Zero Energy Buildings", choosing the right glass to ensure balance between daylight and energy performance  became much more important. Poor choices for glazing design impacts visual and thermal comfort and increases the building energy demand. Good glazing design requires a balance between daylighting and heat gain.

Our country is a unique country that experiences four climate zones in the same year. In this sense, the glass used in windows for “Nearly Zero Energy Building” depends on the climate zone where the project is located, its facade and its installed infrastructure for heating and cooling systems.

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In a "Nearly Zero Energy Building" constructed in a cold climate zone, triple insulating glass units with U value 0.6 W/m2K that incorporates two Low-E coated glass panes can be used. This type of application will provide approximately four times better thermal insulation than ordinary double-glazing and will be a much more effective solution in reducing heat losses from windows.


In a "Nearly Zero Energy Building" built in a warm climate zone, again a triple insulating glass unit with U value 0.6 W/m2K can be used. But this time one of glass panes should be a Solar Low-E (heat and solar control) coated glass to control the solar heat gains through windows. This kind of glazing system reduces the heat losses through the window again four times compared to ordinary double glazing , decreases the total solar heat gains through windows up to 40%  and reduces the cooling costs of the building.


Şişecam Flat Glass's current product range for coated glass that provides energy efficiency, the infrastructures of glass processor that produces triple insulating glazing units and the different types of window systems produced and installed by frame producers can easily reach the NZEB standarts in our country.

As of 2020 the EU countries will look for the NZEB standard in all public and residential projects.  In this sense, with the adoption of NZEB standarts in buildings, the heating, cooling and ventilation loads can be reduced in a sustainable manner. The potential use of renewable energy systems can reduce environmental problems and can give a significant contribution for the national economy.

ZeroBuild Institute©

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