Barnards Farm, Witham A stunning new 6-bedroom home of nearly 1,000 square metres, with views to the rear leading down to a large lake. The house is initially being fitted with a standard GreenTec System - a Heat Pump, Heat Recovery Ventilation, Under Floor Heating and a GreenTec Control System. But the building was designed from the outset to make it easy to retro-fit extra GreenTec System elements at a later date; Solar Panels, Heat Storage Cells and Climate Control can all be added onto the installation with minimal disruption. The lake was immediately identified as an ideal heat store to be tapped into to supply the Heat Pump. As well as being a very cost-effective alternative to drilling eight x 100 metre deep boreholes, water provides for much more efficient heat transfer to and from our collector pipes. Ops Director Lee puts his boating skills to the test. He later reported the water as "a touch chilly". The lake collector pipes were weighted down with engineering bricks attached by cable ties. |
Barnards Farm: the GreenTec System
Heating: The 40kW Danfoss Ground Source Heat Pump is connected to 2.5Km of ground loop submerged in the lake. It will provide all the domestic hot water and Under Floor Heating to all 3 floors. The Heat Pump is sized to be able to cope with heating and ventilating the indoor pool when it is installed.
Ventilation: The heat recovery system will extract stale air from wet areas – kitchens, bathrooms and the gym – and replaces it with fresh, filtered air fed into the living areas. In colder weather, the incoming air is warmed by heat recovered from the outgoing stale air (Heat Recovery Ventilation), further adding to energy efficiency.
Cooling: As the outside temperature rises, the GreenTec System will initially turn off the Under Floor Heating and the Heat Recovery Ventilation. If the temperature in the house continues to rise, the system will direct cold Ground Loop fluid to cool incoming air; the same system will cool the gymnasium.
Environment: Barnards Farm's heating and ventilation system annually produces less than half the amount of CO2 - none of it locally – than it would if it were powered by a conventional gas boiler.
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