This describes a ground source heat pump system that uses an array of pipework, which is buried between 1-1.5m deep as the heat source.
The heat from this array is replenished from the ground and also from the rain. Contrary to popular understanding the majority of the heat replenishment actually comes from the rain (typically 60-70%). For this reason it is imperative that the area used for the heat collector array is not installed under a non-permeable covering e.g. tarmac.
Vertical (borehole) System
This describes a ground source heat pump system that collects heat from pipework installed in boreholes, typically 100-150m deep. The heat extracted by the heat pump from the borehole array is replenished by geothermal energy. This energy is stored in underground rock and water formations.
Boreholes are usually a more expensive option than horizontal heat collectors but do have a number of advantages:
- Less area required than horizontal systems
- Stable underground temperatures throughout the year make them more suitable for systems that require heating and cooling.
- The land on top of the borehole array remains usable for limited development.
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