Carrier AquaForce® 61XWHZE high-temperature heat pumps operating on ultra-low global warming potential (GWP) Hydro-Fluoro-Olefins (HFO) R-1234ze refrigerant have been chosen for E.ON's ground-breaking district heating and cooling scheme in the City of London.
The project is anticipated to cut carbon emissions from heating and cooling by customers connected to E.On’s City of London network by up to 50% and will enhance the air quality in the city by reducing emissions. Carrier is part of Carrier Global Corporation, the global provider of healthy, safe, sustainable, and intelligent building and cold chain solutions.
efforts to decarbonize the city
The refrigerant used in the selected heat pumps, R-1234ze, has a GWP of less than 1 The project is part of a multi-million-pound program by E.ON to improve and upgrade the Citigen energy center, supporting efforts to decarbonize the city and transform how connected buildings in the Square Mile are heated and cooled. The refrigerant used in the selected heat pumps, R-1234ze, has a GWP of less than 1, significantly lower than the previous refrigerant, and therefore has only a tiny fraction of the environmental impact.
Three Carrier AquaForce 61XWHZE heat pumps will extract thermal energy from water pumped from deep boreholes in the aquifer 200 meters beneath the capital. They will also harness waste heat from the existing Combined Heat and Power plant that would otherwise be lost to the atmosphere.
heating and cooling network
The Carrier units upgrade the energy harvested to produce hot water at 80 C. This will be 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.
Innovative, efficient solutions such as AquaForce heat pumps support Carrier’s aim of reducing customers' carbon footprint by more than 1 gigaton, part of its 2030 Environmental, Social & Governance (ESG) Goals.
reduce carbon usage
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 a 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.”
energy efficiency
Carrier heat pumps are leak- and run-tested in an ISO 140001 and ISO 9001 certified facility before delivery
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 utilized."
Carrier heat pumps are leak- and run-tested in an ISO 140001 and ISO 9001 certified facility before delivery. Due to the pandemic, customer witness tests for this project – to prove the units could achieve the challenging conditions required – were carried out remotely via video.
Easy to install heat pumps
AquaForce heat pumps are designed to be exceptionally reliable and are 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. With 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. John Foster added, "In a historical twist, Citigen's plant room once housed the ice-store for Smithfield Market. It is a happy coincidence that the site is being reborn as a center for modern, cutting-edge low-carbon cooling and heating."
