Ground source heat pumps work by extracting the heat from surface soil through a network of ground arrays consisting of slinky pipes buried in trenches.
1m below ground the temperature remains a fairly constant 8-10°C all year round. This makes it an excellent renewable heat source for ground source heat pumps; indeed, surface soil was the first heat source used to work with ground source heat pumps, hence their name.
To extract the heat from surface soil, a network of ground collectors (or ground arrays), consisting of a series of pipes, is buried in the ground in trenches to a depth of 1 – 2m. Typically consisting of coiled pipe, collectors of this nature are referred to as ‘slinkies’.
For every 10m of slinky pipe 1kW of energy can be absorbed from the ground.Read more
How do ground source heat pumps extract heat from surface soil?
A network of ground collectors (or ground arrays), consisting of a series of pipes, is buried in the ground in trenches to a depth of 1 – 2m.
There are two different configurations of collectors for surface soil heat source:
The favoured ground collector by Kensa, this pipe is coiled and then installed horizontally or on its vertical edge to provide maximum heat extraction from the minimum space available; it’s coiled design gives this configuration of pipe the name ‘slinky’. Every 1m of slinky trench contains 5m of pipe, which reduces trenching costs and makes the most of the available energy in every metre of ground.Read more
The same pipe as used by slinkies, but not coiled. This method requires more trenches and therefore will increase groundwork costs.