Passivent - Just the job for new school
What
is believed to be one of the biggest educational natural ventilation
projects is helping take education in Kent into the 21st century.
The new Church of England voluntary aided Bishop Justus School 6th
form entry 11-19 comprehensive school has been completed at a cost
of £26m, to accommodate the growing need for pupil places in the
Bromley area, providing a learning environment for up to 1,200
children. Built on a greenfield site within the local Green Belt,
the brief to architects Barron & Smith was to minimise the
environmental impact of the almost 11,000m2 school, including
incorporation of sustainable techniques.
As a result, Passivent natural ventilation has been installed by M&E
contractor Mitie throughout the teaching spaces, main hall and
sports hall, to provide efficient ventilation to DfES guidelines
during the day, and free night cooling. Passivent believes the
project is one of the largest educational natural ventilation
schemes completed to date in the UK, using approximately 100 wall
ventilators and 27 roof terminals.
On the ground and first floor, 70 Passivent Aircool ventilators have
been fitted into the walls along both sides of the school, drawing
fresh air into the classrooms. The ‘used’ air in the classrooms is
ducted up riser stacks by convection and exhausted using venturi
principles via 17 Passivent Airstract terminals on the roof. To
optimise the internal environment, boost fans have been included in
the food technology rooms. Faculty rooms and music practice rooms
have acoustic Aircools to attentuate noise.
On the second floor, 21 Passivent Aircool ventilators above and
below the windows work together to provide low level ventilation
with high level outlets, giving a draught-free flow of fresh air
into the rooms.
In the main hall, 4 Passivent Airscoop displacement ventilation
units are supplemented in lower windspeed conditions by 6 Aircool
inlets, with a further 4 Airscoops fitted in the sports hall. The
two music rooms each feature an acoustic Airscoop to maintain a
well-ventilated environment whilst minimising noise.
The Passivent Aircools use just 1watt of electricity to modulate the
louvres to minutely adjust the flow of air. The units are set to
continue working after school hours, using a night cooling function,
to dissipate daytime heat build-up using passive stack principles
(whereby warm air rises) to exhaust the warm air up the risers and
out of the roof-mounted Airstract terminals.
Passivent Airscoop ventilators use a roof mounted terminal divided
diagonally into four chambers. Wind from any direction is channelled
down through the windward chambers into the building, which exhausts
warm, “used” air out through the leeward chambers.
John Drewery, architect at Barron & Smith, commented, “The Diocese
of Rochester in its brief had a concept of a school which was
environmentally friendly. We designed the school to fulfil that,
including natural ventilation, sedum roofs, timber cladding and a
sustainable urban drainage scheme. It is DCSF requirement to utilise
natural ventilation strategies if possible.”
Passivent is part of the Building Product Design Group and is the
UK’s leading designer and supplier of natural ventilation systems
for both domestic and commercial applications. The company is a
founder member of the NatVent EC-EU-funded project co-ordinated by
the Building Research establishment to develop practical natural
ventilation solutions for the commercial sector, and has also
contributed to the BISRIA Guide BG2/2005 Wind Driven Natural
Ventilation Systems, as well as being a member of the DfES steering
committee on natural ventilation guidance for schools, Building
Bulletin 101.
Email:
afpr@btconnect.com
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Arundel Jones Associates LLP Registered in England and Wales No.
OC330189 Hill Farm, Linton Hill, Maidstone, Kent ME 17 4AL Tel : 01622 745333
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