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Guest post by Reynaers: Energy Saving Through Windows

Guest post by Reynaers: Energy Saving Through Windows

The energy used in constructing, occupying and operating buildings represents approximately 50% of greenhouse gas emissions in the UK. In the move towards sustainability, construction and buildings in general have been highlighted as a major area for attention. It is clear that innovation and sustainable product design is key in reducing the amount of energy used both in the construction of buildings and in their every day use.

heat loss

To understand how to conserve energy in buildings it is necessary to understand how and where energy is lost through buildings.

It is estimated that 40% of the heating energy loss comes from the windows or the gaps around these windows. To help prevent this there are energy efficient window systems available. These window systems can effectively help to reduce the energy needs for heating; which consequently leads to reduced energy needs for buildings.

U Value calculations are commonly used to measure the heat transmission rate through a material or assembly of materials. The lower the U-value, the higher a material’s heat resistance and hence the better the insulation. This rule applies to aluminium window profiles. Some profile series have a lower Uf-value and are therefore better insulators than others. For the best match between profile (Uf) and glazing (Ug) you have to take into account the U-value of both (Uw):

• Uf = U value of the window frame
• Ug = U value of the glass
• Uw = U value of the frame and glass combined

Major innovations have taken place over the years of aluminium windows. Reynaers are continually working to improve the U value of our range of window, doors and curtain walling products, to ensure that they meet the increasing demands for energy efficiency in construction. We now have a window and door available that can even meet the stringent Passivhaus requirements.

In a Passivhaus thermal comfort is achieved to the greatest practical extent through the use of passive measures listed below which can be applied not only to the residential sector but also to commercial, industrial and public buildings.
• good levels of insulation with minimal thermal bridges
• passive solar gains and internal heat sources
• excellent level of air tightness
• good indoor air quality, provided by a whole house mechanical ventilation system with highly efficient heat recovery

Reynaer's CS104 window system has an industry leading Uw value of 0.77 Wm²K, making it the perfect solution for passive construction

With their knowledge and experience in developing energy efficient systems, Reynaers can work closely with you to advise on choosing the right window system to help meet and even exceed the latest building regulations. Find out more online.

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