04-06 March 2025
ExCeL, London

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Stoke-on-Trent City Council has eschewed traditional chemical additive-based water treatment in favour of Elysator’s electrochemical based system for their new district heating network.
Elysator

Stoke-on-Trent City Council has eschewed traditional chemical additive-based water treatment in favour of Elysator’s electrochemical based system for their new district heating network.

Stoke’s new 150m3 DHN has elected to follow VDI2035 principles and remove the need for inhibitors and biocides from their water treatment regime.

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This is in line with the Danish District Heating guidance which favours demineralised water as an environmental approved method avoiding the use of chemicals. VDI2035 is also in line with CIBSE CP1 2020 Heat Network Code of Practice which now embraces the German Standard in line with their counterparts at VDI (The Association of German Engineers).

Sebastien Danneels, DHN Technical Lead for Stoke, was won over with the cost advantages as well as the operational efficiencies and reliability the system offered. “We were really impressed not only with the increased environmental benefits that were offered but also the reduced operational costs that will follow. The ability to continually demineralise and control operational and top-up water will be key as the network expands”, stated Danneels.

Craig Grobety of Heat Network Associates, who consult with Stoke on their HN strategy said “With VDI2035’s inclusion in CIBSE CP1 we were keen to put the principles into practice with a client’s project. HNA are driving improvements in construction pipework commissioning (cleaning and treating prior to operations) and the Elysator fitted Stoke’s ambition to implement innovative solutions which are commonly used across Europe. With the support of their MD, David Whitfield, it was simple to incorporate the technology within the specification of the pump room and we will monitor its performance going forward”.

An Elysator 800C was specified and following an inspection at Elysator’s UK office was sent to to Vital Energi’s off-site fabrication team. The Elysator was sized for the low ambient temperature of the network until the main energy centre is live and the heat is on. The sizing design also allowed for spare capacity for the future extension of the network. Elysator’s large capacity units of 500 litre upwards are manufactured by IWTM, their maritime division, and are manufactured to bespoke operating pressure & temperature requirements.

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