GROUP SUSTAINABILITY REPORT 2010
BROOKFIELD MULTIPLEX GREEN
Brookfi eld Multiplex Green was established in July 2010 by WSP, the developer Brookfi eld, the M&E contractor Mercury Engineering and the architect Woods Bagot to deliver a one-stop-shop for the green retrofi tting of commercial property. One of its fi rst projects was a services upgrade to improve both the energy and carbon performance of 20 Canada Square in Canary Wharf, London. The building is classifi ed as a Grade A asset, with a gross lettable area of 51,611m2 over 12 fl oors and two tenants with a 92% occupancy. To defi ne the strategy for Canada Square a sustainability review was undertaken to:
• Ascertain the sustainability performance of the building based on carbon footprint, EPC performance and BREEAM rating
• Identify the means to improve the building’s sustainability performance
• Quantify the improvements in terms of capital cost expenditure and benefi ts to the building owner and its tenants (including Carbon Reduction Commitment exposure)
• Recommend appropriate carbon footprint, EPC and BREEAM ratings for the property.
The fi ndings revealed electricity usage to be benchmarked against CIBSE Guide F, with the building operating at 141% excess of the typical-practice benchmarks for a prestige air-conditioned offi ce.
The key upgrade strategy recommendations were:
• New variable-volume high-effi ciency chillers
• Cooling tower operation • Chilled water system operation
• Control feedback to on-fl oor air-handling units
• Car park extractor system • Landlord and tenant sub metering
• Condenser water loop for tempering supply air
Estimated cost savings Full implementation of the upgrade strategy will realise cost savings in the order of
£220,000 per year (2,750MWh/y). CO2 emissions will be reduced by around 1,160 tonnes per year. The estimated payback of the strategy is 4 to 4.5 years based on the total project costs of £924,000.
The work was completed in April 2011 and WSP continues to monitor the building’s operational performance and realise the full forecast savings.
...upgrade strategy will realise cost savings in the order of £220,000 per year.
“ WSP GROUP SUSTAINABILITY REPORT 2010 | 13
NEW SERVICES AND NEW MARKETS
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