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Buildings Sustainability
A measure
and a half
The new UK headquarters for KPMG features a tri-generation system,
active chilled beams and a number of other energy-saving features to
achieve a design that will exceed Part L (2006) requirements by more
than 50 per cent. Paul Haddlesey reports
W
hen the professional services firm the building should have an open and transparent
KPMG produced a brief for the design feel, necessitating the use of a glazed façade, with
of its new headquarters at 15 Canada inevitable implications for solar heat gains. The
Square in London’s Canary Wharf, the design team investigated the possibility of using an
firm presented consulting engineers AECOM with active façade to mitigate these effects but this proved
quite a challenge: to exceed Part L (2006) requirements to be uneconomical. However, on the 14th floor, where
by 50 per cent using techniques that would deliver a there is a double height space, a ventilated façade with
sensible return on investment. supply air at the bottom and extract at the top has been
In line with KPMG’s sustainability management installed. This provides an unobstructed outward view
plan for the development, a BREEAM Excellent rating while ensuring that no heat or cold will be radiated into
is achieved and complies with new office criteria for the space from the glazing.
occupation densities, fresh air supplies and cooling As would be expected in almost any project of
Project team
loads. ‘We set very clear standards for what we required significant size these days, the use of renewable energy
15 Canada
in terms of internal conditions, environmental impact sources was also investigated but none of these offered
Square, London
and energy usage, and then challenged the design team acceptable payback periods. Instead, the building
to meet those criteria within a sound economic case,’ services team carried out a thorough analysis of every
Project manager
says Alastair Young, KPMG’s head of property, Europe. aspect of the services to see where the required energy
Turner & Townsend
The building is a 15-storey structure clad in solar- savings could be achieved.
Quantity surveyor
control glass and architectural metals. KPMG will
EC Harris
occupy around 37,000sq m (400,000sq ft) and, once Active chilled beams
Architect
the building is completed in April 2010, it will enable In the office spaces, for instance, the combination
Swanke Hayden Connell
Architects
the company next summer to consolidate staff from of internal and solar heat gains dictated the use of
several London offices and take advantage of the mechanical cooling. ‘Whilst passive chilled beams
M&E engineer
AECOM
potential operational savings. would have provided the lowest energy solution they
Management contractor
CWG was responsible for the shell and core phase, would not have delivered effective control of comfort
ISG
but KPMG has taken responsibility for its own fit- conditions and flexibility of use, so an active chilled
Mechanical contractor
out. However, in order to meet the environmental beam system was selected,’ Dhaliwal explains.
Skanska Rashleigh
aspirations of the project, KPMG’s design team became ‘Here, the chilled beams are driven by air from Weatherfoil
involved before the fit-out began. the central ventilation system, rather than relying
Electrical contractor
‘It was important to have input at the base build on convection currents, thus increasing the cooling Phoenix Electrical
phase to ensure we would have enough points to capacity of the beams. While this arrangement increases
Company
achieve the required BREEAM rating,’ says AECOM energy use through the fan power consumption, this Ductwork contractor
project manager Jas Dhaliwal. ‘To that end, the was found to be a more efficient solution than using
Imperial Ductwork
Services
centralised online portal created for the project ensured fan coil units or variable air volume.’
we had access to the information we needed. We then There are also plans to experiment with allowing
BMS contractor
DMS
used dynamic thermal modelling to calculate the total the internal temperatures to drift upwards by around
carbon emissions.’ 1°C to evaluate the effects on occupant comfort. If no
Commissioning manager
Baynard Associates
Another key requirement for KPMG was that discomfort is reported, there is potential to achieve even >
www.cibsejournal.com December 2009 CIBSE Journal 33
CIBSEdec09_pp32-35_KPMG.indd 33 19/11/09 16:29:57
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