With the building sector, including our total built stock, being the greatest energy consumers accounting for 40% of all C02 emissions it stands to reason that this is where the greatest energy saving potential is.
Saving energy is what today it is all about, be it for the environment, its steeply increasing cost or the security of supply… or all ofthe above.
Remember 20/20/20? Reduce energy consumption by 20%, cut greenhouse gas emissions by 20% and bring renewable sources up to 20% and do all of that by the year 2020? Not that far away now…
Let us look at one simple aspect of a building; the windows. These are the transparent building blocks of a building. We are insulating roofs, walls and floors to the hilt, but windows ? They are getting better but a lot is yet to be done.
Air conditioning allows for much bolder designs with more and more glass. However, if you consider that Solar gain can easily amount to 400 or 450 W/m2 glass surface per hour then all of a sudden too much glass can prove quite an ‘energy headache’ unless it is properly shaded.
400 W/m2 per hour does not sound much ? Take a modest 5 story office, 10 metres wide x 2.9 meter high glass per floor = 145 m2 of glass x 400 Watt = 58000 Watt or 58 KiloWatt of energy coming in every hour! What is the air-conditioning cost to keep the office cool ? If the energy input could be reduced by 70+ % if we can achieve a g-total figure of 0.3 then the energy consumption picture looks a lot more friendly.
If we take a not so modest building like The Shard in London, the glass g-value of 0.68 has been improved to 0.12 by using proper Solar shading materials. So only 12% of all Solar energy projected at the windows enters the building instead of 68% with glass only.
Standards for shading have now been laid down in EN14501(12) and EN13363-1 (13). Performance data on the shading material itself is quite meaningless. The above standards deal with 4 different types of glazing in combination with the shading material. Only that way can a true figure, the g-total or g-tot, be achieved and do we get data with which building engineers can work.
Ref1ex-Rol U.K., a wholly owned division of De Leeuw Ltd., are and always have been the forerunners in this field with quoting g-values as long back as the 1980’s.
Developing and manufacturing Solar shading materials in close cooperation with Europe’s independent test houses like Frauenhofer in Germany, University of Lund in Sweden and Sonnergy in Oxford.
These materials are now deployed not only in many U.K. buildings but also in more ‘Solar dramatic’ areas like Mexico, Vietnam, Mozambique, United Arab Emirates and even in the Gobi Desert.
Request your copy of the EN14501(12) and EN13363-1(13) reports and see what these materials can do for your building.
Rather than waste energy on reams of paper, please e-mail us with ‘data report’ in the subject line. info(Replace this parenthesis with the @ sign)reflex-rol.co.uk