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Document L 2010

Smart's W.E.R. Calculation Software

Smart's W.E.R. Calculation Software can be used in conjunction with Smart W.E.R. Labels to easily produce Window Energy Ratings for Smart's products in line with the requirements of Document L 2010.

Smart's customers can obtain a copy of the software by emailing the Marketing Department.

NEW SOFTWARE AVAILABLE (Version 3.0) 1/9/2014

The updated software includes the ability to print BFRC Simplified Energy Licences directly from the Software. Companies who have completed the registration with the BFRC are able to set up the registration details by clicking on 'Register' on the file menu. (More Details...)

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DOCUMENT L: CONSERVATION OF FUEL AND POWER

Recent changes in the Building Regulations are being driven by the need for the Government to comply with EU Energy Performance of Buildings Directive (EPBD).

Reducing energy consumption and eliminating wastage are among the main goals of the European Union (EU). EU support for improving energy efficiency will prove decisive for competitiveness, security of supply and for meeting the United Nations’ commitments on climate change made under the Kyoto protocol. There is significant potential for reducing consumption. With 40% of our energy consumed in buildings, the EU has introduced legislation to ensure that they consume less energy.

The new Building Regulations can be downloaded from:

Planning Portal

http://www.planningportal.gov.uk/england/professionals/buildingregs/technicalguidance/bcconsfppartl/

THIS ADVICE IS AVAILABLE TO DOWNLOAD AS A PDF DOCUMENT USING THE LINK AT THE BOTTOM OF THIS PAGE.

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L1 DOMESTIC BUILDINGS

Domestic window U Values have been tightened for new build, refurbishment and replacement windows, with greater restrictions placed on the centre pane U Value compliance route.

Window Energy Ratings apply to all windows on existing dwellings and allow the effect of solar gain to offset heat lost though a window. Window Energy Ratings can be significantly improved using low iron glass and thermally enhanced spacer bars.

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L1 Domestic Buildings
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Key Changes 2010

L1A New houses

Windows  2.0     U Value improved from 2.2
Doors 2.0 U Value improved from 2.2

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L1B Refurbishment and extension to existing houses

Windows             1.6 or C    U Value & WER improved from 1.8 or D
Doors 1.8 U Value improved from 2.2

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The Window Energy Rating (WER) is given by the following equation;
WER = 196.7 x ((1-f)x Gglass) – 68.5 x ( U + (0.0165 x AL)) (kWh/m²/year)

f

Frame Factor

The percentage of the window obscured by frame and gaskets.

Gglass

Solar Transmittance

Normal total solar energy transmittance of the glass as determined by BS EN 410. Low Iron glass will have a high g value and will significantly improve the WER.

U

U Value of whole window

U is the whole window (combined performance of the glazing and frame)
U Value calculated using the methods and conventions set out in BR 443.
Thermal enhanced spacer bars will significantly improve the WER value of the window.

AL

Air Leakage

Air leakage through the window in m³/h.m² at 50 Pa pressure difference based on testing to BS 6375.

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L2 COMMERCIAL BUILDINGS

Whilst new commercial buildings will have to be at least 25% more efficient than existing buildings, the limiting U Values for fenestration remain largely unchanged. The limiting values for windows and doors remain at 2.2W/m²K, although the requirements for high usage entrance doors have been tightened. This approach leaves the building designer a choice between which building elements to improve in the SBEM calculations. Greater focus is paid on reducing the overall building efficiency and a greater emphasis on solar gains and overheating through passive solar control measures.

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L2 Commercial Buildings
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Key Changes 2010

L2A New commercial buildings

Windows  2.2           No change
Doors 2.2 No change
Curtain Wall 2.2 No change
Display Windows    N/A No change
Entrance Doors 3.5 U Value on entrance doors improved from 6.0

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L2B Refurbishment and extension to existing commercial buildings

Windows 1.8 Refurbishment same as extensions
Doors 1.8 Refurbishment same as extensions
Curtain Wall 0.8 to 2.6 U Value relaxed dependent on number of openers
Display Windows       N/A Same
Entrance Doors 3.5 U Value on entrance doors improved from 6.0

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Related Documents
File Type Document Description Download Document
[icon] - Adobe PDF White Paper - ADL August 2013 Document L
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