Trend Control Systems - Five Star Experience At Intercontinental
London Park
 The
five-star experience enjoyed by guests at the newly refurbished
InterContinental LondonPark Lane, is due in part to a Trend building
management system whose duties extend from individually controlling
the air conditioning in each of the hotel ’s 447 bedrooms to
monitoring its supplies of wine and champagne to ensure they are
always at the right temperature. Supplied and engineered by AES
Control Systems, he BMS is also set to play a vital energy saving
role.
The InterContinental’s £76 million refurbishment has left it with
eight floors of elegant guest rooms and suites. Among its amenities
are two new restaurants, a 300m 2 spa and a magnificent ballroom
that accommodates up to 750 people. All rooms and communal areas are
controlled and monitored by the Trend BMS, which comprises some 600
IQ controllers of various types, including Ethernet and LonWorks
based units. These operate together as a single, integrated system.
Every guest room is fitted with a fan coil air conditioning unit
with an IQL controller. Connected to the IQL is a Trend RDU (room
display unit). Through this, the room’s occupants can adjust both
the temperature level and fan speed (to high, medium or low). To
avoid unnecessary use of energy, AES is interfacing the BMS with the
hotel ’s Fidelio front office system so that when a guest checks
out, the fan coil unit in their room will be automatically switched
to a setback condition. The IQL will close the unit ’s heating and
cooling valves and only modulate one or other of them open again if
the space temperature goes outside preset limits. When the next
guest books in, the fan coil will revert to the settings entered by
the previous occupant.
Further IQLs control fan coil units in the hotel’s spa, gym, offices
and meeting rooms. These and the controllers in the guest rooms are
distributed across 17 LON communication busses, which link via
routers to the BMS internetwork that runs throughout the building.
Also connected to this is an Ethernet network supporting IQ3xcite
controllers that regulate the hotel ’s 20 air handling plants – all
of which are new – and its boilers and chillers. Where possible, air
is recirculated to minimise energy consumption. Fresh air volumes
are also controlled to maximise the use of available free cooling.
The IQ controlling the car park extract fan varies its speed
inaccordance with CO 2 levels, a further check on power consumption.
Other IQ3xcites monitor the basement and ground floor cold rooms,
which include food preparation and wine storage areas. They generate
an alarm if high or low temperature limits are breached. A number of
IQ2series controllers switch corridor and external lights – the
latter on the basis o f photocell readings and also log the readings
from 15 electricity meters, which will enable the hotel to identify
any areas of over-consumption.
These meters measure usage in locations such as the laundry, kitchen
and guest rooms.
The IQ2s are networked together on two Trend LANs. Like the Ethernet
and LON networks these are linked to the internetwork. The whole
system which comprises over 5000 input and output points – is
centrally managed from a Trend 963 supervisor located in the hotel
’s maintenance department, which is manned 24/7.Through the
supervisor it is possible to view monitored data from all the
controllers on the system and adjust their control settings.
Occupation times for the meeting rooms and other communal areas with
irregular occupancy patterns are set up on the system supervisor a
week in advance and reviewed on a daily basis. This ensures that the
air handlers only operate when they are needed. The number of hours
run by each air handling unit is logged by its IQ controller and the
totals are viewable on the supervisor. The fan drive belts are
renewed after a set number of running hours, which obviates the need
to carry out routine inspections and reduces the risk of plant
suddenly being lost as a result of a broken belt.
Another way in which the BMS helps to ensure high plant availability
and reduced maintenance costs is by means of an automatic valve
exercising routine performed by the air handler controllers. Should
a valve not have opened by more than 10%in any 24hr period, and the
plant is shut down, it is driven fully open (being returned to its
original position after 15 minutes)This prevents valves seizing
through corrosion. The IQ controllers on the boilers and chillers
and those associated with the meters were installed prior to the
refurbishment and were not supplied and engineered by AES. However
this did not present a problem, as it is a simple matter to upload
an
IQ ’s control strategy. It was thus unnecessary for AES to get hold
of copies of the controllers ’ software or, worse still, rite the
strategies again. With over 500 IQLs to install and commission, AES
was keen to find ways of speeding up the process. They thus decided
to bench test and address the controllers on their arrival on site,
effectively commissioning them before they were installed in the
guestrooms. Consequently they did not have to wait for the rooms to
get power to prove that the IQLs were working. Nor did they have to
do the job with other trades working around them.
This is the second Trend system to be installed at the
InterContinental London. The first, which has now been taken out of
service, was commissioned in 1991. As the hotel’s Director of
Engineering, Paul Carr explains: “It was our experience of that
first system that led us to specify Trend again. The on-going
support that the company can provide was important to us too. We ’ve
also been impressed by AES,and not just because of their ability to
tackle a project of this scale. They ’ve also shown that they care
about their client ’s interests.”
Mr Carr is a firm believer that a BMS must undergo regular
maintenance “If you depend on system monitored data then you have to
be confident it is accurate ”.The hotel has thus taken out a Service
Level Agreement with AES (who are a Trend ‘IQ Assured ’ Accredited
Partner) that not only provides emergency breakdown cover but also
twice-yearly system check-ups. Trend ’s service division will
support them in this, dealing with any out-of-hours faults. If these
can ’t be rectified remotely, a service engineer will visit site
(within 4hrs). Other InterContinental Hotels with Trend building
management systems include those in Sydney, Jakarta, Lusaka, Berlin
and Frankfurt.
Email:
energy@trendcontrols.com
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