Hamworthy brings renewable energy to school in Norfolk

Hamworthy Heating, renwable energy, biomass, space heating, boiler
This Hamworthy biomass boiler is part of the renewable-energy strategy at a school in King’s Lynn.

With oil-fired heating and gas-fired hot water plant at Fairstead Community School in King’s Lynn coming to the end of its expected life, Norfolk County Council took the opportunity to look for a more energy-efficient solution that would satisfy the school’s heating demand and reduce its carbon footprint.

Stephen Stanforth, building-services engineer at NPS Property Consultants, explains, ‘The school’s heating was running on an oil-fired boiler and the hot water on a direct gas-fired water heater. There was not a sufficient gas supply nearby to fulfil both the heating and hot-water requirements, and the school was keen to move to a greener fuel source than oil. We needed to review all the available options to see what would be the best solution for the school — both financially and environmentally.’

NPS Property Consultants worked with Hamworthy Heating and its agent, Mike Crouch, to design a tailored system for the school, which has over 320 pupils. The scheme combined solar thermal and a biomass boiler, and the school was able to part fund the project through the carbon-emission-reduction fund from Norfolk County Council.

Equipment installed by Eyre Building Services included a Herz Firematic 199 kW biomass boiler using wood pellets to provide heating. The space previously used for oil storage was utilised for the flexible hopper wood-pellet store with blown delivery to the boiler. A Kamstrup heat meter measures heat generated for claiming the Renewable Heat Incentive.

A Trigon solar-thermal system satisfies the hot-water needs of the school. Six flat-plate solar collectors on the roof feed two Powerstock PS500 calorifiers. There is an RHI-compliant heat meter.

A Stratton 100 kW wall-hung boiler provides peak-load duty assist and standby for the biomass boiler.

With current RHI tariffs, the school hopes to benefit from payments of 8.4 p/kWh for heat from the biomass boiler and 10 p/kWh for eligible heat from the solar collectors.

Stephen Stanforth concludes, ‘The school caretaker, Darren, has been hands-on throughout the project to understand how the specialist equipment works. This enabled a smooth handover to the school, and Darren is able to clean and monitor the equipment to ensure it is operating as effectively as possible all the time.’

For more information on this story, click here: Oct 2014, 128
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