Marlborough College has taken a giant leap forward in its
building management practice by replacing its old stand-alone
series of building controllers with a Priva internet-compatible,
remote access BMS. The project, which sees the 'integration' of
around 40 separate buildings, has allowed this prestigious
independent boarding school to save phenomenal amounts of man hours
and redirect resources into other functions.
"Initially Marlborough College investigated the possibility of
integrating its existing stand-alone controllers into a network for
use by a BMS system," explains Derrick Lailey, project engineer for
PA Collacott & Co, the Priva partner responsible for installing
the new system. "However, this idea was deemed uneconomic as the
controllers were not internet compatible."
The idea to use Priva proved far more appealing, especially as the
college's existing system had no central reporting features. The
functionality, flexibility and modularity of the Priva technology
soon led Marlborough College to make the step to a fully integrated
BMS.
"The college liked the fact that with Priva there are no
protocol or modem compatibility issues," says Mr Lailey. "We
explained that the system would create a central head-end computer,
located in the IT service racks, whereby important performance data
could be accessed over the web at three PC points, one in the
central boiler house and the other two in the estates office.
Additionally, the head mechanical engineer/boiler house manager
would have a laptop that would allow him to connect remotely to the
system and take control of the BMS from anywhere in the
world."
The 40 or so buildings at Marlborough College are made up of
classrooms, residential blocks, leisure buildings, libraries,
plant/equipment houses and stores/stock rooms. Prior to the
installation of the Priva BMS, a simple change to heating timers
would require an engineer to walk around all of the buildings and
change the data using a plug-in, hand-held interrogation device.
This simple task could take hours if not days to complete. Now it
can be done in seconds using a few keystrokes on a computer.
Historic installation
Founded in 1843 in the market town of Marlborough,
Wiltshire, the college is a flourishing and fully
co-educational, independent boarding school for pupils
aged between 13 and 18. It was established when a
group of Church of England clergymen, with the backing of the
Archbishop of Canterbury, were looking to found a boarding school
with the prime purpose of educating the sons of
clergy. Hearing that the Castle Inn at Marlborough was vacant,
they took a lease and the rest, as they say, is history.
With historic buildings of this ilk it is always important for BMS
installations to respect the structure of walls, ceilings and
floors. However, because the Priva system does not require screened
cabling, it can utilise existing BMS cabling (assuming it is still
fit for purpose) thereby safeguarding the building's fabric.
The installation process at Marlborough College involved PA
Collacott removing the old stand-alone controllers and I/O boards,
replacing them with Priva system components. In all cases a
professional assessment of the existing cabling and sensors/field
devices was made - these were used wherever product integrity
allowed their ongoing use - if not, then replacements were fitted.
By working closely with the college staff, in particular the IT
department and mechanical engineers on site, it was possible for
the team to ensure a smooth transition between the two systems.
Ultimately the process was completed in the most cost effective
manner, with disruption to the school's every day operation kept to
the absolute minimum.
Priva HX6E and HX8E BMS systems form the basis of the system. Both
are internet-compatible controllers and can be connected easily via
the Ethernet port to the Local Area Network (LAN). In some
instances, where an Ethernet connection was not required, a
simpler, more cost effective unit such as the HX3 or HX4 was
installed.
"In the swimming pool building, for example, the changing room
area was fitted with a HX4 controller which could communicate via
RS485 bus to the HX8E controller fitted next door in the swimming
pool arena," says Mr Lailey.
Once all of the Priva kit had been installed the software was
commissioned and the system went live at the end of May 2010. PA
Collacott & Co is also providing ongoing training for the
College's maintenance engineers to ensure that they remain
comfortable and familiar with the new system.
Huge savings
"The saving in man-hours for Marlborough College has been
phenomenal," says Mr Lailey. "All of the resources required
previously to attend to the stand-alone controllers has now been
redirected to other important functions."
Among the many additional benefits, the college now has far better
sequencing on its boilers - all three on-site boilers can now
perform heating or hot water tasks whenever required. Also, due to
the detailed reporting capability of the Priva BMS, on-site
engineers can now pinpoint immediately any areas requiring
investigation - before it was like finding a needle in a haystack -
saving huge amounts of time and cost.
page 4
At present the Priva BMS oversees all of the college's heating,
hot water and air system requirements. Heating oil levels are
configured so that alarms are sent to the estates management team
once 'reorder' levels are reached. The system also controls and
monitors data from the only new building in the mix - the Heywood
House - which is equipped with ground source heat pumps and solar
panels. At present, only a small amount of metering is undertaken.
However, this latter function is set to increase in the near future
as the modularity of Priva systems allows expansion at any future
point.
With this in mind, Marlborough College is now seeking to expand the
system to incorporate the kitchen steam plants. At present, a
college employee has to start the steam plants manually at 05:30
every morning. He is looking forward to a lay-in!
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