Integrated control
August 1st 2008 The building controls at the Radisson SAS Waterfront Hotel in Jersey ensure that the
energy saving technology operates effectively and lowers its carbon footprint as
well as complying with Part L of the Building Regulations
The building control
installation at the hotel set
records for the controls
supplier, Priva Building Intelligence,
and for the M&E contractor, Bailey
Building Services, a division of NG
Bailey. Ben Seabourne, applications
engineer for Bailey Building Services
and project manager for the
controls installation:"It proved to be
our largest integration project with
the Priva system interacting with
250 VRFs, over 40 meters and a
Fidelio hotel booking system, all of
which came complete with different
communications protocols: the VRFs
use LonWorks, the meters use
Modbus and the Fidelio has its own
proprietary protocol." For Priva, this
may have been their largest joint
integration project working with
Bailey, but the multi-lingual
communications challenge is an
every day accomplishment for their
controllers.
The new property has views of
Jersey's Elizabeth Marina, Elizabeth
Castle and St Aubin's Bay, 195 guest
rooms and suites, a Cocktail Bar, a
French Brasserie and a leisure suite
with swimming pool, gymnasium,
sauna, steam room, and four
treatment rooms. As the M&E
contractor, appointed by
Camerons, Jersey's only chartered
building company, Bailey Energy
Controls (a department within
Bailey Building Services that
managed the HVAC,water services
and electrical supplies) was
responsible for the controls
content of the project.
The protocol mix:
250 Toshiba variable refrigerant flow
(VRF) split air conditioners have
been installed in the hotel providing
heating and cooling to the
bedrooms and public areas. "All
heating and cooling requirements
are provided by the splits, with air
handling units (AHU) supplying
background ventilation, there are no
radiators in any of the rooms," said
Ben Seabourne. The Bailey design
team recommended AHUs complete
with plate heat exchanges, run
around pumps and inverters on the
supply and extract fans, all of which
contribute to the hotel's excellent
carbon footprint.
In line with Part L of the Building
Regulations that requires the
installation of sub-metering for new
non-domestic buildings, over 40
meters have been installed within
the building to provide a profile of
energy consumption throughout
the hotel. Due to the integration
possibilities offered by Priva
controllers, which includes Modbus,
Bailey's proved that specifying
Modbus meters, even though they
were slightly more expensive than
traditional meters,was more cost
effective in the long-term. This is
due to the reduced cabling required.
"The RS485 port that is standard on
all Priva controllers meant that we
could connect the meters directly to
the building management system
(BMS),"explained Ben Seabourne,
"and connection to the BMS really
was a case of unpacking the meters
and plugging them into the system."
At the Radisson SAS Waterfront
Hotel the Fidelio booking software
manages guests' heating and power
supplies. Linked to the BMS, heat
and power to the rooms are enabled
dependent on whether the room is
unoccupied, on standby waiting
occupation, or occupied. While
waiting for the guest to book-in,
their room is held in standby mode
with a wide heating/cooling dead
band of between 12°C and 28°C.
Heating and cooling is only
introduced to the room should the
temperature drift outside this dead
band and only sufficient heating or
cooling is supplied to bring the
temperature back within the band.
On checking-in at reception, the
dead band for the guest's room is
narrowed to 18°C to 24°C providing
comfort control on their entry. A
local controller enables the guest to
fine tune the room's temperature to
suit their specific needs. More articles from Priva Building Intelligence Limited: | 
