Facilities management Case study
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The Waterloo Barracks holds > performance reviews more frequently. Also, have the
priceless exhibits such as the
assessor put the equipment under a more powerful
Crown Jewels, and requires a
microscope than legislation requires.
We found that some of the filter
constant temperature.
Darren Jones, the assessor from Efficient Air, did medium coils were blocked, making
just that: ‘There is a requirement to look inside some
the motor work harder, consume
of the air-handling units. But we went further and
did pressure tests. We found that some of the filter
more energy and possibly in the
medium coils were blocked, making the motor work short-term burn the engine out
harder, consume more energy – and possibly, in the
– Darren Jones
short term, burn the engine out.’
It used to be a commonly held view that you would Air’s report included cleaning or replacing filters and
rewind motors in air handling units if you had an coils, mending broken door catches and the lagging
engine failure. Some research has suggested that a of ductwork. One AHU needed a recalibration of a
Key facts
re-wound motor is around six to eight per cent less temperature sensor to stop the machine running at near
efficient than when factory-new. The newer energy full capacity. For the most part, payback is set between
Waterloo
efficient motors, rated Eff1, can typically save between two and eight months, certainly well within a year.
block
six and 10 per cent energy over older types, says King. But estimates of savings are only that, says King. To
Total floor area of the
In effect, a rewound motor means you have a unit of turn the estimates into real cash, he urges facilities
three-storey Waterloo
up to 16 per cent less efficient than its new replacement managers to improve their follow-up procedures; also,
block, including the
of similar specifications. Value for money for rewinding they should check to make sure that staff complete their
basement, is 60,300 sq
ft, with a conditioned
versus new has to be weighed up from this perspective, tasks, as his experience has told him that things can get
area of 32,300 sq ft.
says King. left for another day. There is, however, not likely to be a
Ground and first floors
Waterloo’s chilled water system was switched off for pot of gold at the end of the assessment rainbow.
conditioned by 10 air
the winter so it was not possible for Efficient Air to ‘In a site like this there won’t likely be something
handling units (AHUs).
assess efficiency. But the efficiency of the compressors, that will save you [a large sum of money]. It will be
Top floor offices radiator-
refrigeration units and cooling towers, around 25 to 30 the odd thing here and there that can save a couple of
heated only.
years old, is not too bad, says King. New refrigeration thousand pounds each. But it all adds up. You won’t
Basement archive
systems using the latest inverter technologies generally become rich by changing only one item.’ l
storage is conditioned by
another AHU.
have up to 15 per cent greater cooling capability and
use only half the energy. But replacement, rather than A version of this article first appeared in FM World,
All 11 AHUs are fixed-
volume systems.
deep maintenance, is being driven more by legislation the magazine of the British Institute of Facilities
on HCFCs. The vast majority of quick wins in Efficient Management. www.fm-world.co.uk
42 CIBSE Journal October 2009 www.cibsejournal.com
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