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Air conditioning Efficiency
You cannot
have multiple
dropping their
chosen solution
into a project
– Ted Berry
> Controls loads and time schedules during an occupancy period.
Ord points to the area of control as offering by far the This is straightforward, but I am constantly amazed
greatest potential for carbon reduction, but this does not by end-users who have just one on-off time set for a
need to be sophisticated. ‘A simple adjustment of on-off whole system, where they could have up to 50 time-
times, a reduction of set points, and putting in place temperature changes set up on units in a zone.
systems that automatically switch equipment off when ‘Where such control systems are set up correctly,
necessary can really make a difference,’ he says. we estimate that the running cost savings can be up
Maintaining tight control is also important to to 20 per cent.’
Above: Air curtains can link
Wright: ‘The key to carbon reductions is to use However, the critical aspect for Berry is how systems
to other systems. Below:
building management system controls to ensure that integrate, both with each other and the fabric of
Daikin produces a proprietary
variable refrigerant volume
the system is set up to switch off when the building is buildings, and this, he says, means that controls are
unoccupied, and changing set points to suit different the key element in every project.
He believes we still tend to work in an outdated
way, calculating heating, cooling and lighting loads
separately, but – by looking at a building holistically,
it is possible to come up with a more accurate picture
of what the building actually needs and so deliver far
more appropriate and energy efficient solutions, he
‘You cannot have multiple specialists dropping their
chosen solution into a project any more,’ he adds. ‘It
doesn’t work.
‘To be sustainable, you have to take a holistic
approach and put commissioning of the complete
building at the heart of everything you do. The
important thing is not the technology, but how you
put the solution together.’
Carrier is finding that designers are, indeed, taking
a more holistic view in order to meet current and
expected energy legislation. Says Keogh: ‘An example
is combined heat and power in conjunction with
absorption chillers.’
This willingness of enlightened designers to
integrate every element of a project also implies an
openness to consider renewable technologies, a point
confirmed by Keel. ‘By using renewable solar heated air
or the ground as a source of energy heating, a building
can be made to be sustainable.
‘Fossil fuel burners push out tons of CO2 which
can easily be saved with the use of heat pumps. They
are relatively easy to install and operate. Part of their
success lies with modern electronic controls, coupled
with the ability to monitor their service remotely. In
some cases, a service visit can even be arranged before
the user knows there is a fault.’ l
44 CIBSE Journal December 2009
CIBSEdec09 pp40-42,44 aircon.indd 44 19/11/09 16:27:37
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