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Two technologies serve ‘tallestmodular building’
Viessmann boilers and a Viessmann CHP unit have been specified to provide space-heating and domestic hot water to 546 apartments at 101 George Street, the new residential development in Croydon, London, which is described as the tallest modular building in the world
echanical and electrical design contractor Red Electric chose Vitocrossal gas- condensing boilers for their high
efficiency and low NOx emissions. 101 George Street is a high-quality
development of private rental and build-to-rent units comprised of two towers, one 38 storeys tall and the other reaching 44 storeys. The apartments in this new south London landmark are connected to a district heating system which integrates the six Vitocrossal 200 CM2 620 kW
M2 620 kW gas-c W gas-c ondensing
boiler s and a single Viessmann Vitobloc EM70 CHP (combined heat and power) unit.
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 systemis the integration of the two technologies,” said
Viessmann technical director, Christian Engelke. “Installing almost 4MW of heat generators and 'only' 115kW of thermal heat output from the CHP involves careful planning. The boilers are
sequenc ed b y Viessmann’s Vitotronic 300 cascade controller,which ensures the systemmeets 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
constructionmethod produces 80% less waste than conventional building processes, requires fewer workers on site, and takes less time on site. Fromthe start of construction to the first residentsmoving in took just 30months.
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www.heatingandventilating.net
December 2019
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