LANDMARK RENEWABLE HEATING INSTALLATION DELIVERS HEATING AND PASSIVE COOLING FOR RAGT SEEDS
RAGT’s initial brief was to reduce the heating costs for its six glasshouses, which are used for developing new crops. LPG had previously been used to heat the glasshouses which, with a U value of around six, meant the boiler was in constant use in winter, leading to issues with fuel supply and heat distribution as the system couldn’t keep up with the heat being generated. RAGT needed a new system to work with its existing grow tubes.
Finn Geotherm installed three Lämpöässä T120 ground source heat pumps linked to three Akvanti 2400litre thermal stores with a network of 21,000metres of collector loop. Controlled using Trend building management, the 350kW ground source heat pump totally replaces RAGT’s previous LPG system.
While specifying ground source for RAGT’s heat requirements, Finn Geotherm identified an opportunity to utilise the new system to deliver air circulation and cooling. This would ensure a constant temperature all year round for crops to thrive in. Glasshouses had been known to reach 45°C (compared to the target temperature of 21-22°C) and low level techniques, such as painting windows and using fans, were ineffective. However, the implementation of a cooling system had to be very carefully developed to ensure the system did not impact negatively on the Renewable Heat Incentive (RHI) available to RAGT Seeds for the ground source heat pump installation.
Finn Geotherm’s team of experts devised a bespoke passive cooling system to circulate air at ambient ground temperature from the ground loop. Cool air is circulated through 24 Jaga AVS fan coil units (four per glasshouse) using a control system which activates if the temperature increases by 1°C from target. Passive cooling delivers the reduced temperatures needed by RAGT in summer using minimal energy. Air circulation from the cooling system has made a significant impact too, providing a ‘gentle summer breeze’ in the glasshouses. Along with the better regulated temperature, RAGT is also now enjoying enhanced plant growth and expects to reduce chemical inputs.
Steve Brown, Operations and Production Manager, RAGT Seeds, said: “The ground source heat pump system is delivering everything we hoped at a lower energy cost than expected. The quality of workmanship throughout the job was exceptional with obvious care and pride being put into every aspect of the installation. We fully expect the system to make a huge contribution to our energy efficiency and to improve our glasshouse productivity, as well as dramatically reducing our emissions and enabling a reduced use of chemical fungicides. Gaining these benefits, with the expectation of significant RHI income over the next 20 years, makes this a very successful project which we hope to replicate at other sites.”
Guy Ransom, Commercial Director at Finn Geotherm, said: “The installation at RAGT Seeds has not only revolutionised the way in which the company heats its glasshouses, but also how it cools them too. The energy and cost savings are outstanding, with plant room meters showing a Coefficient of Performance of 3.9:1 to date, which is excellent. This landmark installation also provides a blueprint for hundreds of other applications, from similar horticultural projects to sports halls and indoor arenas.”
For more information on ground and air source heat pumps and details on Finn Geotherm, visit www.finn-geotherm.co.uk.
Finn Geotherm is East Anglia’s leading supplier and installer of ground and air source heat pump systems for domestic, commercial and industrial customers. Ground and air source heat pumps use the latest technology to generate heating and hot water from renewable sources. Established in 2006, Finn Geotherm is the only approved installer of award-winning Lämpöässä ground source systems in the UK and one of only a handful of expert installers for Dimplex Renewables. For more details and case studies, visit www.finn-geotherm.co.uk.
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