PASSIVELY ADDING TO THE MIX OF ENERGY EFFICIENCY…
 Ahead
of new legislation coming into force that requires commercial and
public buildings to be energy rated like electrical appliances,
Passivent has developed a solution that ‘ticks all the boxes’…
In a phased introduction, from April 2008 all commercial buildings
being built, sold or rented must by law have an Energy Performance
Certificate (EPC), with all public buildings having to display one
by the end of the year. Certificate classes range from A to G, with
A being the most efficient for both energy consumption and CO2
emissions. Passivent’s innovative mixed mode cooling system has been
proven in ‘real life’ to achieve Class A, with the added benefits of
saving almost half the energy used by traditional mechanical
ventilation, reduced plant capital and maintenance costs, improved
indoor air quality and occupant performance, and greater useable
floor space.
Developed in conjunction with Mitsubishi Electric, the Passivent
mixed mode system combines natural ventilation and comfort cooling
in offices, shopping centres, schools and hospitals where there may
be high internal heat gains and high expected levels of comfort.
Warm air naturally rises, creating a flow of cooler air into the
space. The Passivent system controls that natural physical
principle, using minimal energy, purely to regulate the flow. By
drawing outside air into the building, the building is cooled 24/7,
keeping internal temperatures comfortable when occupied, and
removing unwanted heat when the building is empty. An Intelligent
Controller constantly monitors internal temperatures, and air
quality; when they vary outside preset levels, in exceptionally hot
or cold weather, the controller triggers operation of the Mitsubishi
air conditioning unit, purely to restore the preset internal
temperature and CO2 levels.
Studies have shown that energy consumption over traditional
mechanical ventilation is reduced by 41%. Because the building is
primarily aired naturally, incidence of sick building syndrome is
reduced, thus improving occupant performance. There is a reduced
requirement for plant space, optimising useable floor space.
The system can be retro-fitted as well as incorporated into new
build schemes, and can adapt to the building’s changing use over
time. Passivent and Mitsubishi have both retro-fitted the mixed mode
system within their office headquarters, and yielded a reduction in
energy bills of over 40% as a result.
Wayne Aston, Passivent Commercial Technical Manager, comments,
“Already, 50% of CO2 emissions in the UK derive from buildings, and
heating and cooling can account for more than 50% of a commercial
building’s energy consumption. A well controlled and energy
efficient ventilation system is therefore a prerequisite for low
energy consumption and a reduction of CO2 emissions, especially if
it additionally helps ‘future proof’ the building.”
Passivent 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 is a committee member of CIBSE’s natural ventilation group and
has participated in relevant natural ventilation guidance
documentation.
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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