Our product range includes vertical closed loop, energy piles, horizontal closed loop, slinky closed loop and closed pond loop ground source heat pump systems.
Ground loop
A closed circuit pipe is buried in the ground, filled with a mixture of water and antifreeze, which is pumped around the pipe absorbing heat from the ground. The types of ground loop available are:
- Vertical, for use in boreholes
- Energy piles
- Horizontal, for use in trenches
- Spiral or slinky, for use in trenches
- Pond or lake loops
Vertical closed loop
A vertical closed loop field is composed of pipes that run vertically in the ground. A hole is bored into the ground and pipe pairs in the hole are joined with a U-shaped cross connector at the bottom of the hole creating a loop.
Vertical loop fields are typically used when there is a limited square footage of land available. Bore holes are spaced 5-6 metres apart and drilled to a depth of between 70-120 metres. They benefit from higher ground temperatures than trenches and are more efficient.
Energy piles
Structural building piles offer an alternative low cost ground source solution. Flexible plastic ground loop pipe work is placed within the structual pile during the piling process. The pipe can be attached to the piling cage or inserted directly into the wet concrete that forms the structural pile. The concrete provides an ideal energy transfer medium, which allows the energy derived from the ground to be used in conjounction with a heat pump to heat and cool the building.
The process of inserting the pipe within the structural pile is undertaken by the piling specialist, while the remaining works are undertaken by ENER-G in a similar fashion to that of a vertical closed loop bore hole solution.
Horizontal closed loop
A horizontal closed loop is composed of pipes that run horizontally in the ground. A long horizontal trench, deeper than the frost line, is dug and U-shaped coils are placed horizontally inside the same trench.
Horizontal trenches are dug 1.5-2 metres below ground level and are ideal for smaller systems. 
Slinky closed loop
A slinky closed loop field is installed in the horizontal orientation where the pipes overlay each other. Where there is not adequate room for a true horizontal system, a slinky loop field is an ideal solution.
Closed pond loop
In a pond loop, coils of pipes are installed at the bottom of an appropriately sized pond or water source and the loop is attached to a frame.
Our extensive experience and specialist technical knowledge means we can identify the type of loop system, which is best suited for your building.
Heat pump
The GSHP is operated by electricity or gas to extract heat from the ground in cold periods or to return heat to the ground when the temperature is high. ENER-G supplies a range of heat pumps between 5kw and 1mw. These can be used to supply heat distribution systems such as radiators, fan coils, chilled beams, underfloor heating or space heating.
We are also experienced in the supply and installation of hybrid systems which see the integration of GSHP’s with other technologies such as CHP, condensing boilers or chillers.
How does your heat pump work?
Please see the diagram below:
- A large quantity of low grade energy absorbed from the ground is transferred to the refrigerant. This causes the temperature of the refrigerant to rise changing it from a liquid to a gaseous state.
- The refrigerant is then compressed, reducing its volume by causing its temperature to rise significantly.
- A heat exchanger then extracts the heat from the refrigerant to heat water for the chosen heat distribution system.
- After giving up its heat energy the refrigerant turns back into a liquid and can once again absorb energy from the ground, allowing the cycle to begin again.
