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Buildings Sustainability
Key facts
• HVAC and lighting <50 per cent of the carbon
emissions of the Part L notional building;
• BREEAM Excellent with a score of 72.93 per cent
• Tri-generation system;
• CO2 emissions <35 CO2kg/sq m;
• 55 per cent grey water reclaim by using blow-down
from cooling towers;
• 200 cycle spaces;
• 350sq m sedum roof;
• Variable speed pumping;
• Evaporative humidifiers;
• Heat-recovery thermal wheels in main air handling
The teamwork
units; and
between
• Daylight control.
the different
Plant specification
disciplines has
Energy management
made a positive
An addressable building lighting control system with Heating
contribution to
daylight linking, emergency monitoring and ballast • 1 x tri-generation 800kW heat exchanger;
error feedback will be provided. The lighting system • 4 x 890kW high-efficiency, low-NOx boilers;
the success of
presence detectors are linked to the environmental • Boiler flow/return temperatures = 80°C/60°C; and
the project
control system of the building, which enables the • Chilled beam flow/return temperatures = 45°C/38°C.
– Jas Dhaliwal
temperature set points to be relaxed when no occupancy
Cooling
is detected in the particular zone.
• 1 x 620kW absorption chiller;
Presence detectors are also provided within the toilet
• 3 x 2334kW water-cooled centrifugal chillers;
and changing facilities to enable the water supply to be
• 1 x 1167kW water-cooled screw chiller;
shut off when no presence is detected in the area.
• Chiller flow/return temperatures = 6°C/12°C; and
In addition to these ‘headline’ energy-saving features,
• Elevated flow/return circuit temperatures for
other design elements that contribute to the overall
chilled beams = 14°C/16.5°C.
energy performance include efficient lighting (mostly
T5 fluorescent) linked to daylight and occupancy Ventilation
controls, and variable speed pumping of chilled and Four main air handling units, each providing
hot water. around 17cu m/s of outside air. Each air handling
unit consists of heater battery, cooling coil, thermal
Zoning and measuring wheel, filters, evaporative humidifiers and supply
In order to provide accurate measurement of energy and extract fans.
consumption, each floor has separate metering of
Metering
chilled water, low temperature hot water, lighting and
Energy meters for measuring electrical, heating and
small power – as well as water used in toilets. ‘This
cooling consumption are provided at each floor.
arrangement provides a flexible building in enabling
close monitoring of the effects of any changes within Power
the spaces,’ Dhaliwal notes. Automatic Staged Power Factor Correction to 0.95
inductive.
Grey water recycling
While not impinging directly on energy consumption,
the inclusion of grey water recycling was an important spaces with lockers, changing facilities and showers
element of KPMG’s commitment to sustainability and as part of KPMG’s Green Travel plan, and a 350sq m
is expected to reduce water consumption by at least sedum roof.
30 per cent. Says Dhaliwal: ‘Water from wash basins With its attention to detail, this project has not only
and the cooling tower will be stored in a recycling tank exceeded the requirements of the current Building
in the basement and used for flushing urinals and Regulations, it also looks set to more than satisfy the
WCs. anticipated 2010 regulations, according to KPMG.
‘This arrangement is more efficient than just using ‘We were aware that we were setting a challenging
water from wash basins, as blowing down water from design task to everyone involved in the design team and
the cooling towers gives us a 55 per cent grey water we have been very pleased with the results,’ says Young.
reclaim potential. The situation will be monitored ‘The teamwork between the different disciplines has
through the meters on each floor.’ been very good and made a positive contribution to the
Other sustainability features include 200 cycle success of the project.’ l
www.cibsejournal.com December 2009 CIBSE Journal 35
CIBSEdec09_pp32-35_KPMG.indd 35 19/11/09 16:30:37
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