HEAT PUMPS
require only a small input of electricity to raise heat from a wide range of sources, including the air, the ground, a factory, a subway network or a water treatment plant, to name just a few. This can then be boosted to temperatures of up to an impressive 95°C to supply heating, hot water - or both - directly to a neighbourhood or city area. The Bunhill Heat and Power Network project in central London for example, uses heat pump technology to reuse waste heat from the London Underground. Environmentally friendly and economical heating is supplied to 1,350 homes, a school and two leisure centres in Islington. Gateshead in northeast England relies partially on natural heat captured from water in fl ooded disused coal mines. The water is boosted from 15°C up to 80°C using two 3 MW GEA ammonia heat pumps. The resulting hot water supplies heat to hundreds of homes and other public and private buildings in the area.
Why switch to a heat pump?
Heat pump solutions, either combined with energy-effi cient refrigeration systems or stand-alone, can improve heating
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performance signifi cantly, lowering energy consumption and decreasing operating costs. John Burden, director of project sales at GEA Heating and
Refrigeration Technologies UK, adds: “A heat pump is also a future-proof investment, especially since regulations are striving to phase out carbon-intensive technologies. Excess heat is a by-product of so many industrial as well as everyday life activities and it normally costs a lot to release. A heat pump raises captured heat to a useful temperature, avoiding the necessity to burn something to create the same eff ect.” As fl uorinated gases are phased out worldwide to reduce
greenhouse gas emissions, natural refrigerants like ammonia are increasingly being turned to. Ammonia’s thermodynamic effi ciency makes it a very economical choice and, thanks to improvements in compressor technology, ammonia heat pumps can now produce higher temperatures than was previously possible. This has paved the way for their increased use and ammonia heat pumps are now becoming more widespread in food processing plants, beverage and dairy industries, breweries and cold storage facilities across the world.
A number of high-profi le manufacturers have installed ammonia- based heat pumps in recent years and are achieving signifi cant results.
www.acr-news.com • December 2024 23
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