Kingfisher Brise Soleil - Technical Background

Building Regulations
Approved Document L2A Conservation of fuel and power in new buildings other than dwellings, 2006
Section 1 Design Standards: Criterion 3:
Limiting the effects of solar gains in summer

Spaces not served by air conditioning systems

Provision should be made to limit solar gains so as to reduce internal temperature rise in summer. This can be done by an appropriate combination of window sizing and orientation, solar protection through shading and other measures. BR 364 and CIBSE AM10 offer guidance on strategies to limit solar gain. Specific guidance is given on what would be considered reasonable provision.

Spaces served by air conditioning systems

For spaces served by air conditioning systems, reasonable provision for the control of excessive solar gains is demonstrated by meeting the TER (Target carbon dioxide Emission Rate).
If solar gains are controlled to the limits for non air-conditioned spaces, cooling energy demand can be reduced, and it will be easier to achieve the TER.
The TER is based on a notional building with modest amounts of glazing. Building designs with more glazing will have to compensate through enhanced energy efficiency measures in other aspects of the design.

Running costs
BRE report BR 364 Solar shading of buildings 1999 includes:

• Calculations based on the Hevacomp software show that a typical office building can suffer 5-20% of total heat gain through glazing.
• Solar shading to the glazed area could reduce this heat gain by as much as 50-85%.
• Properly designed shading could reduce building running costs by 3-13%.

BREEAM assessments
BREEAM, the BRE Environmental Assessment Method, can be used to assess environmental performance of buildings. Credits are awarded under a range of environmental aspects according to performance, and added together to produce a score. Brise soleil can help achieve BREEAM credits by reducing the overall demand for energy and increasing the thermal comfort of the building.

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