November Refurb and Retrofit Magazine

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Renewables & Sustainability Hanover turn up the heat When Hanover Housing Association decided to upgrade the heating at Ashfield Court, a complex of 22 flats, they hadn’t realised at first just how different their ‘fuel switching’ would be. Built in 1977, the flats were warmed by electric night storage heaters which had reached the end of their useful life and need replacing. Hanover Housing Association had this site earmarked for ‘fuel switching,’ meaning that they were intending to install a new mains gas supply to the site with individual boilers in each dwelling. However, the near-by gas main did not have sufficient capacity to allow the flats to be added to it. This meant bringing in a new gas main from over 500 metres away. Additionally, due to the design of the flats it was not easy to find suitable locations for the flues - this ruled out gas as a cost effective solution. This ground source heat pump upgrade project features: • A Kensa Shoebox ground source heat pump (6kW) in each flat • New 150 litre unvented hot water cylinders in each flat • New radiators in each flat • New heating controls in each flat, which will be much easier for the residents to use • A ground source heat pump for the site office • 12 boreholes were drilled with depths of up to 154 metres to form a communal ‘micro district ground source heat pump system’ Hanover decided to look at other options for heating the flats and it became clear that a micro-district ground source heat pump was the best solution. Although the up-front capital cost was more, the potential to receive both ECO funding and RHI income along with lower maintenance costs meant that this system would more than pay for itself in the long-run; it was the cheapest long-term solution. In addition, the running costs for the aged 55+ residents would be the lowest possible, helping to address fuel poverty. All of this was enough to convince the Hanover board to opt for Kensa micro-district ground source heating. Designed for groups of properties, Kensa’s micro ground source heat network, also known as ‘district heating,’ provides each home with its own ground source heat pump, ensuring heating and hot water independence. The ‘heat network’ is created by linking multiple properties to a communal ground array, designed to deliver an efficient, reliable and durable source of heat for the life of the property. And with no need for a plant room, the micro district heat network solution also overcomes the drawbacks of traditional ‘central plant’ district heating systems. This project was the first using micro district ground source heat pumps that Hanover has been involved with, and they hope to use it as a blueprint for future heating upgrades in their housing stock, as they see the benefits the system can bring to the tenants (lower fuel bills) and to them as the landlord (payback via the Renewable Heat Incentive). www.kensaheatpumps.com 8 Refurb retrofit magazine Nov 2016 R2
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November Refurb and Retrofit Magazine

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