YEARS
Sponsored by Smith Brothers Stores
Air Conditioning Project H
E.ON City of London District Cooling and Heating Scheme Carrier
igh temperature Carrier heat pumps operating on low Global Warming Potential (GWP) refrigerant R-1234ze
have been chosen to power E.ON's ground- breaking district heating and cooling scheme in the City of London. The project is part of a multi-million- pound programme by E.ON to improve and upgrade the Citigen energy centre, supporting efforts to decarbonise the City and transforming how connected buildings in the Square Mile are heated and cooled. Three Carrier AquaForce 61XWHZE heat pumps extract thermal energy from water pumped from deep boreholes in the aquifer 200m beneath the capital. They also harness waste heat from the existing Combined Heat and Power (CHP) plant that would otherwise be lost to atmosphere. The refrigerant used, R1234ze, has a GWP of less than 1, compared with 1300 for R134a, the refrigerant it replaces, and therefore has only a tiny fraction of the environmental impact. The Carrier units upgrade the energy harvested to produce hot water at 80°C. This is used to provide up to 4MW of heating and 2.8MW of cooling to residential and business customers via a district-wide network of highly insulated pipes, running underground for 10 kilometers. Customers connected to E.ON’s heating and cooling network include the Barbican arts and residential complex, the Guildhall and the Museum of London. The project is anticipated to cut carbon emissions from heating and cooling by up to 50% and will enhance air quality in the city by reducing emissions. John Foster, project lead for Carrier, said:
"The high temperatures required by the project are normally very challenging to achieve. However, AquaForce heat pumps are designed specifically to generate high temperature hot water from relatively low-grade energy sources, while maintaining excellent energy efficiency. In addition, the way the units are multiplexed in the overall system ensures their capacity is fully utilised." Antony Meanwell, head of Low Carbon Solutions - City Energy Solutions at E.ON, said: “Tackling the environmental impact of heating, especially in densely populated areas, will be key to meeting the UK’s 2050 net zero targets, and by installing heat pump and geothermal technology at Citigen we’re making a powerful statement of what can be done to reduce carbon usage on a large scale.” He added: “No project on this scale – or as pioneering in its vision – simply happens. It has required a huge team effort to develop the ideas, translate them into plans and finally make our project a reality on the ground.” Carrier worked closely with the porject project partners throughout the lengthy planning, design and implementation stages. The heat pumps were leak- and run-tested in an ISO 140001 and ISO 9001 certified facility prior to delivery. Due to the pandemic, customer witness tests for this project – to prove the units could achieve the challenging
of the year
conditions required – were carried out remotely via video. AquaForce heat pumps are designed to be
exceptionally reliable and based on Carrier's proven twin-rotor screw compressor, which has bearings with oversized rollers, oil-pressure lubricated, and a motor cooled by suction gas for extended operation, even at maximum load. Despite its advanced features and performance, the heat pump is designed to be quick and easy to install for contractors, requiring only an electrical supply and water source. Streamlined electrical and hydraulic connections ensure quick set-up and commissioning.
42 May 2022
www.acrnewsawards.com
Dominic Holland (left) with Dave McSherry of Carrier and Chris Allsop (far right) from sponsor SBS.
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