HEAT PUMPS


Engie & Kensa behind the UK’s largest shared ground loop system


Kensa Contracting has secured the contract to deliver the UK's largest shared ground loop heat pump system with Engie. Four hundred flats over eight tower blocks in the London borough of Enfield will be retrofitted with Shoebox heat pumps manufactured by Kensa Contracting’s sister company Kensa Heat Pumps, and connected to the largest collection of district arrays of its kind, reports UKPN.


E 30-50%. Shoebox heat pumps manufactured by


sister company Kensa Heat Pumps will be retrofitted at 400 flats in eight tower blocks in the London borough of Enfield. Dr. Matthew Trewhella, Kensa’s Contracting Director, told MEP: “This project is an excellent example of how district heating can be rolled out using the shared ground loop system architecture. “One of the great strengths of this system


type is its flexibility and scalability. Shared ground loop systems can be featured in developments of just two properties (micro- district) whilst this project clearly demonstrates how the concept can be scaled up to much larger systems. “Not only do ground source heat pumps provide the lowest cost heat, they also deliver substantial carbon savings, and landlords benefit from the exceptionally low servicing and maintenance costs.” The system architecture allows each


ngie and Kensa Contracting’s project will be completed by October 2018, with the heating upgrade resulting in residents’ energy bills reducing by


resident to select his or her own preferred energy supplier to access the best available electricity tariff. The shared nature of the ground array design also reduces drilling costs - typically the most cost-prohibitive aspect of a ground source heat pump installation. It also ensures funding through the Energy Company Obligations (ECO) Scheme as well as the Government’s Non- Domestic Renewable Heat Incentive (RHI), securing Enfield Council quarterly payments for 20 years. The district ground source heat network


system at Enfield will feature 16 shared ground loop systems serving the eight tower blocks. Each district system will typically consist of clusters of eight boreholes serving individual heat pumps installed within the flats of half a tower block. With typically two thirds of the heating sourced from the ground, the borehole installations will provide an infrastructure which will deliver an affordable heat and hot water solution for the Enfield tower blocks for generations. Drilling of the boreholes has already commenced with one site’s groundworks


“This project


is an excellent example of how district heating can be rolled out using the


shared ground loop system architecture. One of the great


strengths of this system type is its


flexibil ity and scalabil ity.“


­ Dr. Matthew Trewhella, Kensa


Contracting Director


20


already completed. Using micro district ground source heat pump (GSHP) systems, where a heat pump is installed at each property, allows tenants to benefit from the lowest possible running costs and receive independent billing through their electricity supplier as the individual heat pump is connected directly to the individual tenant’s supply. This also means tenants are able to shop


around for the cheapest possible deal rather than being forced to buy heat from the building owner as with traditional central plant district heating systems. The ability to fully heat the home at a lower cost not only significantly improves the well-being of the resident but also reduces building maintenance issues relating to condensation and mould. The use of micro-district GSHP’s makes


the roll out in small rural communities viable where alternative forms of heat are not feasible or affordable. The micro-district architecture negates the need for a plant- room, has no risk of heat losses, is scalable (each micro-district system can be for as few as two connected properties) and enables the enants to be billed by their own preferred electricity supplier enabling the best deals. There is no need for a central pumping


station, as the individual circulating pumps in each unit will provide the necessary flow rate in all operating conditions, this also allows the ground side flow rate to modulate perfectly to the load without the need for any external complex controls. www.kensaheatpumps.com www.engie.co.uk


JANUARY‐FEBRUARY 2018 UK POWER NEWS


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