“ It is envisaged that the CHP will contribute
to a further carbon reduction of up to 30%
by providing efficiently locally-generated
electricity without losses.
VIESSMANN
Each apartment draws what it needs from the district heating
system via a heat interface unit (HIU). The main plantroom is
located two floors below ground-level, but to accurately regulate
heating-provision at the upper levels, some equipment is also
located in a mini-plantroom on the roof.
101 George Street’s developer specified that the boilers should be
capable of providing double the forecast peak heat demand, so
that if one set of equipment should ever have to go offline to fix a
fault, an identical set can immediately take over. This high-level
specification is typical of the entire development. All homes share
amenities including a podium garden, roof-top gardens on top of
each tower, a panoramic viewing walkway, gyms, and a residents’
lounge.
“The highlight of the heating system is the integration of the
two technologies,” said Viessmann technical director, Christian
Engelke. “Installing almost 4 MW of heat generators and ‘only’ 115
kW of thermal heat output from the CHP involves careful planning.
The boilers are sequenced by Viessmann’s Vitotronic 300
cascade controller, which ensures the system meets its target
temperature. The CHP is designed as the lead generator providing
the base load heat; the boilers are then enabled appropriately
when the building requires it.
“It is envisaged that the CHP will contribute to a further carbon
reduction of up to 30% by providing efficiently locally-generated
electricity without losses,” concluded Engelke.
All levels above the first floor at 101 George Street have been
formed from modules, more than 1,400 in all. These were
manufactured in Bedford, where they were also fitted with
electrics, plumbing and windows. This construction method
produces 80% less waste than conventional building processes,
requires fewer workers on site, and takes less time on site. From
the start of construction to the first residents moving in took just
30 months.
www.viessmann-us.com
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