GROUND SOURCE HEAT PUMP
Electrically driven device that extracts heat from the ground in order to provide, via a simple heat exchange mechanism, space and water heating for a building.
GROUND SOURCE HEATING PUMPS PUMPS (GSHP)
- At about 1.0m below the ground level the ambient temperature is stable at about 5 degrees C and this can be harnessed using GSHP.
- GSHP systems have four essential components:
- A pump
- A condenser
- An evaporator, and condenser
- Plastic pipes known as ground loops or ‘slinkies’ laid at a depth of 1.0m
- Operating on the same principle as a fridge, ground loops or ‘slinkies’ contain a water based refrigerant or ‘brine,’ which absorbs the latent heat of the ground.
- The refrigerant is then pumped through the evaporator and condenser under pressure to raise the temperature to approximately 50 degrees C to heat water for distribution around a building, normally in an underfloor heating system.
- Although providing sufficient hot water for heating an average 3 bedroom house, they would not be able to meet all the DHW needs of a domestic hot water cylinder, consequently most GSHP package today are sold with roof mounted solar thermal hot water heating systems
- Powered by electricity (ideally green tariff or renewable supply)
- GSHP is not providing renewable energy, however due to their high ‘coefficient of performance’ ratios of power in to heat out they have low energy consumption and associated CO2 emissions when compared with conventional gas fired domestic heating systems and can show savings in the order of 40%.
- Larger commercial system using deep well bores harness the natural geo-thermal properties of ground water at approximately 100 m. deep, operating on the same principle as domestic scale GSHP, but on a larger scale.
(based on Building Magazine Steve Piltz, Turner & Townsend ’08
corrected by NGS BRM ’09 but not entrirely convinced by this one)
GROUND SOURCE HEAT PUMP (GSHP)
A system that extracts heat from the ground, upgrades it to a higher temperature and releases it where required for space and water heating.
(GreenSpec AEP ’09)