Some 250 m of pipework buried below the playground at Wormholt school in west London extracts heat from the ground using a water-glycol mixture.
The wet underfloor heating system in a new extension of this school, the exterior of which appeared as the exterior of Grange Hill in the BBV television series, is supplied with water at 40°C.
Efficient heat transfer in the built-in storage tank of the Eco Diplomat heat pump for the DHW system is achieved by a tap-water stratificator. The tank can hold 180 l of water at 60°C.
The advanced scroll compressor is specially designed for heat-pump applications.
Diplomat units have a 3-stage electric heating element that can supply heating in 1.3, 3 and 4.5 kW stages for the few days a year when it may be necessary.
To cope with the expansion and contraction of the ground caused by the buried heat exchangers, a special porous asphalt to cover the trenches in the playground.
