Boreholes beneath Grassmarket help Eco Heat Pumps bring green energy to new Edinburgh apartments
18 February 2008, News release from Eco Heat Pumps Ltd
An Eco Heat Pumps system will provide energy efficient heating and hot water for new apartments created in the heart of Edinburgh's Grassmarket.
The heat pump will draw heat energy from 14 boreholes driven deep into earth to power a mini district-heating system serving the development by Hillcrest Housing Association. Drilling in such an area is no easy task - the rig had to pass through a narrow close with scarcely a millimetre to spare on either side!
Narrow alleyways and old buildings are all part of the charm of the historic Grassmarket Square with its unique mixture of architectural styles spanning the 17th to the 21st Centuries. Once the scene of public executions, the Grassmarket is now highly fashionable, with a wide selection of shops and pubs and restaurants standing shoulder to shoulder, ready to offer the best food and drink in the Scottish capital's Old Town. The new apartments in Gilmours Close - a mix of 1, 2, 3 and 4-bedroom units - are being created within Grade B listed buildings
Eco Heat Pumps of Sheffield developed a geo-thermal system based on a 45kW Thermia Robust unit to serve the 17 Hillcrest apartments.
A water-glycol mixture is pumped through pipework in the boreholes drawing naturally occurring heat into the system from deep below the ground surface. The heated water enters the flow side of the Eco Robust Heat Pump located in the plant room. Here the action of compressor and condenser brings the water temperature up to the levels required by the apartment building's underfloor heating and hot water systems.
Versatile Thermia Robust Heat Pumps are used by Eco for larger scale projects. All models feature a sub-cooler, de-superheater and a quiet running scroll compressor. Potential energy exchange is 5:1.
The system at the Grassmarket development will be weather compensated with external and flow temperature sensors modulating operation of the heat pump. In this way the target temperature of 55oC for the supply to the 1000
litre hot water store, which serves the individual apartments, can be maintained year round. Eco technology makes a perfect partner for all types of warm water underfloor heating - in this case used in association with wooden suspended floors.
The Eco Heat Pump System is designed to achieve a Seasonal Performance Factor or SPF - an average COP over the course of the year - of 3.5:1 bringing the new building well within the carbon emission regulations.
For further information please email Eco Heat Pumps Ltd