Thermal Break Door & Window Frames

What are thermal break door & window frames?


        A thermal break in the aluminium profile is the insertion, between the outer and inner part of the profile, of a material called polyamide, which is a poor conductor of heat.
    Thanks to its composition, this material is distinguished for its thermal and chemical resistant properties.
    The polyamide insertion results in an interruption of the thermal bridge created between the 2 metal parts, which would allow the transition of heat from the exterior to the interior and vice versa.
    The restriction of heat loss through the aluminium is therefore achieved to the greatest degree possible.
Why choose thermal break aluminium door & window frames?

       The use of a thermal break or non-insulating aluminium system is related to a frame's TWO main parameters.

·         * the frame's thermal insulation.

·          * the possibility of water vapor from the interior areas appearing as condensation on the system's surface, and particularly on the frame. 

    The use of an aluminium thermal break system improves the frame's performance in both cases mentioned above.


     Frames and glazing comprise a large source of energy leakage toward the exterior.

In numbers :

     Heat loss through a frame (aluminium profile), which represents 31% of the system's overall surface, amounts to 74.87 Watts in the case of a non-insulated system, as opposed to 44.92 Watts in the case of a thermal insulating system.

    In other words, common aluminium systems manufactured in previous decades exhibited approximately 67% greater heat loss compared to aluminium thermal break systems.

    Heat loss is expressed with the heat-transfer coefficient U ( W/m2K ).

    The use of an aluminium thermal break system improves the final heat transfer coefficient of the frame Uw by more than 20% compared to the heat-transfer coefficient of non-insulated aluminium systems.

    The final heat-transfer coefficient of the aluminium thermal break system Uw, combined with Low-E glass, provides optimal energy efficiency and energy saving characteristics reaching up to 35%. 

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Low-E glass

low e glass

             The new generation of Low Emissivity glass. 

      This type of glass allows light to pass through it, while at the same time providing thermal insulation.
 This is the result of a special metal coating on the interior of one of the two glass panes (in double glazing), which exhibits high reflectivity to infrared radiation.
    This coating consists of various microscopic metal oxides which impede heat transfer from the outer side of the glass to the inner side and vice versa.

This means it does not allow heat transfer from the exterior of the house to its interior and vice versa.

     These coatings can be completely transparent, or have various colour hues. The result is a glass pane which, in its final form, has the desired shade (tinted, bronze, pale blue, etc.).

    When analyzing the thermal losses as a result of the building's structural elements, we come to the following conclusions :

•    20% of heat loss is due to the roof
•    25% of heat loss is due to the walls
•    20% of heat loss is due to the flooring
•    35% of heat loss is due to the windows

   Soft-coated Low-E glazing doesn't only reduce the amount of heat transferred from the building's exterior to its interior, it also filters solar radiation.

       This allows it to greatly reduce the permeability of ultraviolet and infrared radiation—which results in the wear of carpets, curtains, furniture etc.—by up to 70%.

All of the above are determined by certain energy coefficients

There are three important coefficients when selecting the type of glass:

Α)    Uvalue or Κ - value W/m K: heat-transfer coefficient  

      it expresses the rate of heat loss per square meter of glass between its inner and outer surface of the glass pane, and is determined by a surface's ability to absorb or emit heat.
     The lower the emissivity, the lower the heat-transfer coefficient K, and, therefore, the more energy-efficient the glass.

Β)   Solar Factor - g: solar factor,

ε  it is one of the most important factors and expresses the percentage of overall solar energy/heat passing through the glass to the interior space.
Its values range from 0-1.
Due to the intense heat during Greek summers, it is very important to minimize its value (0), otherwise the glass functions as a heat passage that results in excessive interior heat, which overburdens the air conditioning units.

Γ) Light Transmission - LT: light transmission,

ε   it expresses the percentage of visible light passing through the glass.
  The higher the coefficient, the more light passes into the space.
A low light transmission coefficient increases the consumption in artificial lighting systems.
The ideal values of this coefficient range from 60% - 80%.

 Therefore, for an optimal energy-efficient result, we should select glass panes with :

·            Low Uvalue

·            Low g

·           High LT

In the summer, those panes :
     1.  reflect the sun's infrared light 
     2.  act as a shield against indirect heat from the surrounding area – facilitate cooling
     3.  reduce cooling costs (by up to 35%)
     4.  reduce artificial lighting costs

In winter, the panes : 
     1.  act as a shield against heat trying to escape the interior – provide more efficient thermal insulation
     2.  reduce heating costs (by up to 35%)

 Low-E glazing allows us to manage solar light to our advantage, creating a comfortable environment with the lowest possible cost, both financially and in terms of energy-consumption.

For more information,  click here και to contact us.


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Founded on 1996 by Mr Theodoros Tsigkos, Center-Al developed to a big modern industrial facility which fabricates modern aluminium architectural systems.

Window and Door Replacement

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Chalkida Manufacturing Plant :
4th km Chalkida - Afrati Rd.
Tel. +30 22210 52772

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