Stephen Runicles, right, says the key to achieving BREEAM Outstanding was ‘starting with a good base building’
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was that, under the more challenging criteria of the revised BREEAM, their low-energy design would only have scraped into the third best category: BREEAM Very Good. As it stood, this building would not be raising any bars. PwC upped the ante and set a target for the building to achieve BREEAM Outstanding (2008). To achieve this rating the design would have to achieve a minimum of 85 out of a possible 100 environmental points. This was uncharted territory. To stand a chance of getting close to the threshold of
85 points, collaboration between the developer’s and tenant’s design teams was essential to grasp every opportunity to tease every last credit out of the scheme. ‘You’ve got to be determined to set and achieve these new standards – involve people early on and make sure the support of your developer, contractors and design
BREEAM Taking credit for achieving ‘Outstanding’
The eight out of a possible 10 credits achieved by 7 More London were: • Involvement of expert accredited professional BREEAM advice from pre-stage C (= two credits)
• Meeting over 50% of the building’s energy demand using low and zero carbon technologies
• The building becomes a learning resource by displaying environmental performance data to staff and visitors
• 80% recycled aggregate used in the concrete • Exemplar performance under the considerate contractors’ scheme
• Recovering heat from the chillers that would normally be rejected to atmosphere, and using this heat in the perimeter heating system • Water sub-metering
team matches the vision of your clients,’ says Spittle. BDP undertook a detailed study to assess the impact
of BREEAM 2008 on both shell and core design and fit- out in order to identify further opportunities to achieve environmental performance improvement. Fortnightly workshops were established to address key decisions and to optimise the integration between the shell and core and the fit-out designs. ‘The key to attaining the Outstanding rating was
to start with a good base building;’ says Stephen Runicles, environmental design director at BDP. Fortunately Roger Preston and Partners’ design for the base building already included many low energy and environmentally beneficial features. These combined a high-performance building envelope based on an argon-filled, low-transmission glazing system fitted with extensive shading to minimise solar heat gains. ‘Their design also included a biofuel-based tri-
generation system to produce heat, power and cooling using absorption chillers (CCHP). The system incorporated two engines each capable of developing 385kW of electricity along with 400kW of heating and 416kW of cooling. Also included in Roger Preston’s design was a solar thermal hot water supply to the core’s toilet pods and a heat recovery ventilation system. Various enhancements were also added to the
original proposals. A regenerative braking system was incorporated into the building’s 16 lifts. The specification of the CHP engines was enhanced to enable them to run on any biofuel, including used cooking oil. Plate heat exchangers were added to CCHP units to increase the use of waste heat and extend the CCHP unit’s run time so that they now provide up to 25% of the building’s total electricity demand. The environmental designers were helped in
their task of securing more BREEAM points by the building’s structural designers Arup, who succeeded
28 CIBSE Journal July 2010
www.cibsejournal.com
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