Termochromic glasses

Termochromic glasses - as it is clear from the title itself, properties of these glasses depend on temperature modes.    So, if in the photochromic glass its optical features depend on UV-radiation, then in thermochromic glass they depend on temperature. Thermochromic glasses prevent room overheating. Contrary to photochromic glass thermochromic glass is used for roof glazing.

Application of photo- and thermochromic glasses in the modern houses increases not only comfort level but also enables consumers of such technologies to save energy costs. 

Such glasses in automatic mode can prevent room overheating and unload conditioning system. Moreover, thermochromic effect can be useful for glass roofs and attic windows.

Thermochromic glass changes its optical properties under temperature.  This glass has the layered structure with a layer of special gel that is darkened with temperature rise. This property is very useful for passive houses. Thermochromic glass operates automatically without additional energy sources, does not require power and any additional devices (controllers, breakers, control units).   These glasses can be used for making a floor-to-ceiling window as well as for roof glazing. 

Glass changes its colour and properties under temperature. Its operating principle is in shadowing according to the room heating and sun light intensity. Thermochromic effect itself is a reversible change of device transmission in UV and/or visible and/or infrared spectrum that happens because of temperature change.

Termochromic glass properties

  • Temperature-dependent

  • It darkens in hot weather not passing sunlight and heat in a room

  • In the cold weather they are absolutely colourless and provide solar heat in the room

Thermochromic glass advantages - high energy efficiency with functionality

  • Prevent room overheating

  • Provide significant savings in room conditioning*

  • Operates automatically without additional energy sources

 *On the basis of insolation in sun days for south regions with the average amount of sun days 200 per year = 4800 hours we obtain next values: 

direct thermal load caused by the solar energy is 900 W per sq.m. based on average thermal load of glass 500 W per sq.m. and annual average amount of solar hours 4800 so annual energy consumption per square meter of glass increases by load from solar energy in a room (500W per sq. m. in a room (500W per sq.m. Х 4800 hours): 4= 600 kW/h. If control of thermochromic glass solar power is 80%, then power saving per year will be: 600 kW/h х 80% = 480 kW/h/sq.m. Therefore office building with the total area of glazing 10 000 sq. meters using thermochromic glass can save in building conditioning up to 15 millions roubles per year (depending on the electricity rate).


Residential / Commercial

  • Roof glazing

  • Panoramic windows

  • Canopies and eaves

  • Garret windows

  • Attic windows

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