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GSHP CONSIDERATIONS WHEN CHOOSING BETWEEN BORE HOLE AND TRENCH SYSTEMS
When considering installing a ground source heat pump one could choose between a network of horizontal collectors laid in the immediate proximity to the ground’s upper layers at small depths, or opt for vertical ground source heat pump boreholes instead, which is also known as vertical closed-loop geothermal heat exchangers. Selecting between these two systems, conceptually similar but structurally different, comes down to the available space for a geothermal pump installation, the square footage that requires heating and the budget allowance one can sanction for carrying the installation works.
Vertical boreholes are good for small or limited areas, borehole heat collectors produce a higher heat yield per metre, compared to horizontal collectors, which entails a better energy efficiency rate.
A ground source heat pump borehole represents a closed loop system which comprises a set of polyethene pipes that are vertically inserted into the ground and which circulate water to and from the geothermal heat pump. In most cases, the borehole size will range between 15 and 122 m deep.
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