Schools And Education Facilities Supplement February 2010

Schools and education facilities supplement Case study
Carbon Roll-call of energy
saving measures
Natural ventilation: Its usage instead of fans and
cooling to move the same quantity of air in the
building is projected to save 180,000kWh/yr, with
instant payback.
Daylight: Seen as 70 per cent better than a poorly
day-lit building (where artifi cial lighting is used
continuously during working hours). Savings
projected at 85,000kWh/yr, with instant payback.
Heat recovery: When used on mechanically
ventilated areas, is projected to save 50,000kWh of
heating a year, with payback in 30 years.
Typical classrooms were modelled using Lightscape modelling software during
Variable rate ventilation on mechanical ventilation:
the design stages. This image shows a false colour plot of daylight which indicates
Based on presence-sensing and CO2-level
daylight levels and uniformity on each of the fl oors.
monitoring, is projected to save 54,000kWh/yr,
with payback in 10 years.
> A ground-source heat pump was installed at a cost
of around £350,000. This was funded with support Photovoltaics: Will produce 16,000kWh electricity
from a Low Carbon Buildings Programme grant. The per year, with payback in 41 years (including grant
heat pump, together with 50 loops of pipe extending funding).
100 metres deep below the sports pitch, provide three-
quarters of the energy needed to heat the academy. This Ground-source heat pump: Will use 70,000kWh
system also provides low-energy cooling for areas such of electricity, removing the need for 315,000kWh
as the gym and the computer server room, and ‘free’ of gas. Payback in 95 years (again, including grant
cooling to the classrooms. funding).
Electricity is generated through 130 photovoltaic
panels on the roof that deliver enough power to light
50 of more than 70 classrooms.
The classrooms have responsive underfl oor heating,
says Bentham. It is designed to go with a raised access
fl oor, with the pipes sitting in insulated trays that clip
onto the back of the metal fl oor. This means that the
heating pipe is in contact with the metal skin of the tile
– which is more responsive than encasing it in concrete
Project team
– allowing it to warm up and cool down a lot quicker.
While no actual performance data are yet available,
Client: City Academy Trust
the design model predicts that the energy performance
Client representative: City
is 40 per cent better than Building Regulations Part
of London, City Surveyors
Department
L 2006 standards, and the building has a Very Good
(63.8 per cent) BREEAM rating.
Contractor: Willmott Dixon
Construction
In terms of projected energy effi ciency, the school ventilation and daylight work were taken across to the
meets the Department of Children, Schools and other site. In the feasibility study we found that this site
Architect: Studio E
Architects
Families’ target of beating the ‘reference building’ – where it was actually built – was the best one.’
carbon emissions by 60 per cent. Despite this, says Bentham, the project was ‘relatively
Cost consultant: Northcroft
But one of the biggest problems came not from painless’ compared with normal schemes this size.
Services engineer: Max
the usual suspects, such as fans not running at the The school, which is sponsored by the City of London
Fordham LLP
right speed, minor control issues and keeping the cost Corporation and consultants KPMG, has welcomed
Structural engineer:
down, but from a change in site location. This sliced six its fi rst intake of 210 students but should eventually
Dewhurst Macfarlane &
Partner
months from the design process. Design work began in accommodate 1,140 students. Those involved in
late 2006 on a nearby site but site acquisition problems the project believe it has succeeded in providing an
Construction project
management: City of
meant that the process had to start again on a new site ideal learning environment by optimising natural
London, City Surveyors so that construction could start in January 2008. daylight and ventilation, maintaining comfortable
Department
‘This was a major upheaval,’ says Bentham. ‘The temperatures, and controlling noise. ●
Overall project manager:
architects had a lot of work in terms of replanning the A new LG5 Lighting for Education guide will be
Appleyard
building, but a lot of fundamental principles of how the launched later this year by the SLL. (www.sll.org.uk)
8 CIBSE Journal February 2010 www.cibsejournal.com
CIBSEfeb10_School_pp4-6,8_Academy.indd 8 25/1/10 15:40:30
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