Trend Control Systems - Bridging the generation gap at
Derringford Hopsital
 The
future-proof nature of Trend building controls is nowhere more
evident than at Plymouth ’s Derriford Hospital. The latter ’s
site-wide BMS incorporates every generation of Trend IQ controller
so far developed, all working together as an integrated, centrally
managed system. The much- expanded system, whose original elements
were installed in 1982,has been a key part of Derriford ’s on-going
and highly successful energy saving programme, and has also proved
an
invaluable maintenance aid. The latest phase of the BMS ’s
development has seen it expanded into a major new extension to the
main hospital block.
Administered by Plymouth Hospital NHS Trust, Derriford provides both
general hospital and specialist services, and has recently acquired
a medical school. Over the last quarter of a century it has grown
out of all recognition, as has its Trend BMS.
Originally comprising just two controllers it now has more than 300
–a mixture of IQ1,IQ2,IQ3 and IQL series models. Among them is an
IQ150 – which was the first intelligent building services controller
ever to be developed. Much of the system – particularly its more
recent parts – has been supplied and engineered by Bristol-based 2As
’Limited,a Trend Technology Centre.
The company ’s latest project has involved installing a combination
ofIQ3s and IQL11s to control and monitor the HVAC services in the
hospital ’s new 9-storey,12,000 m 2 extension, which provides
additional cardiac facilities, a new general intensive care unit,a
medical library and research facilities.
The 45 IQLs control office fan coil unitson the building's
administration floor. The LonWorks bus to which these connect is
linked via a Trend 3xtend router to an Ethernet network of
22IQ3xcites and IQ3xacts on the ‘wet ’heating,air handlers, DHW and
other plant.
The same router also links the Ethernet and LonWorks networks to the
site-wide internet work that forms the BMS ’s communications
‘backbone ’,also connected to which are 15 LANs. Distributed across
these are the numerous IQ1 and IQ2 controllers. There are also
several more IQ3s,in a theatre suite extension opened last year. The
entire system can be managed and monitored from a single point,
through Trend supervisors in the main hospital building.
As well as controlling and monitoring the HVAC throughout the
12-storey main hospital block and its new extensions, the BMS takes
in nearby staff residences, the medical school and a radiology
academy, which is located about a mile away. These last two
buildings were opened in 2005 and in both there are IQL-controlled
fan coil units. In the medical school there are also IQLs that
operate high-level windows to provide ventilation. The progressive
and easy expansion of the BMS has been facilitated by its flexible
architecture, and by Trend ’slong-standing policy of backward
compatibility. This has allowed new generations of controls – such
as the IQ3 series – to be fully integrated into the existing system,
a voiding the need for complex gateways or the total replacement of
older controls. Derriford has an annual energy bill of some
£2,500,000 and its energy consumption in 2005/06 stood at
55.76GJ/100m 3 net heated volume, which compared very favourably
with other NHS hospitals of its type. (Themedian value for large
acute units outside London was 73.91GJ/100m 3 .)The Trend BMS is
making a significant contribution to the site ’s impressive levels
of energy efficiency, as it has for many years.
One way in which the system has prevented energy wastage is by
enabling much stricter time control of the HVAC services, and thus
preventing the unnecessary heating or cooling of unoccupied areas.
Savings have even been made in the operating theatres – of which
there are over 30 – by the air-handling units being automatically
switched to low-speedafter midnight. (The plant can be manually
switched back to full-speed if a theatre is needed.)
The system is also making increasing savings through variable speed
control of fans and pumps. For instance, the output of the hospital
’s main hot water pumps is closely matched to demand by regulating
their speed in accordance with differential pressure readings. A
similar strategy will be applied to control of the secondary chilled
water pumps in the new extension. Moreover, the system will be able
to control the chilled water temperature on the basis of outside air
temperature.
There will be speed control too of the building ’s three main AHUs,
via Trend NX inverter drives on their supply and extract motors. A
number of the air handlers in the main block are similarly equipped.
With the Department of Health requiring the NHS to cut 15%off its
carbon emissions by 2010,the BMS ’s energy saving role will assume
even greater importance in the years ahead. Lighting control may
well be part of this future role.
The savings made by the BMS have not just been in energy, as
Derriford’s Maintenance Supervisor, Norman Spiller explains: “The
Trend system has been an indispensable maintenance tool, one that
has saved us an enormous amount of legwork. Without it we would
probably have needed
another dozen M&E staff.” Using a ‘client ’ Trend supervisor on his
desk,Mr Spiller can view conditions and plant status throughout the
hospital.He is also able to diagnose faults and adjust control
settings.
Further supervisors in one of the main plant rooms provide the same
facility to other members of his team. It is here that
system-generated plant alarms are reported. Monitoring temperatures
on the domestic hot water systems – a vital measure in preventing
legionellosis – is among the BMS ’s duties. Should any of a number
of temperatures breach their pre-set limits an alarm is instantly
generated. For example, the DHW return must be above 50 ºC and the
cold water supply below 20 ºC. Every week, sensor readings stored
within the controllers are automatically uploaded and archived by
the main supervisor. This provides a continuous temperature record,
which is an HSE requirement.
Derriford is well aware that to get the most from the BMS it must be
regularly serviced and maintained. Part of this maintenance work –
including the periodic recalibration of sensors – is
done by the hospital ’s own personnel. It also has a service
agreement under which a Trend field service engineer spends a day on
site every other month. In addition, Trend is working with the
hospital to gradually upgrade the older IQ controls, some of which
have been operating continuously for over 20 years.
Email:
energysavings@trendcontrols.com
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