How does a closed loop borehole work in an aquifer?

Closed loop boreholes can be used to extract heat energy from aquifer heat sources in ground source heat pump installations.

As with all closed loop systems, the principle of a closed loop borehole is that at no point does the fluid in the borehole leave the system, it is continually cycled through the closed system.

The benefit of using a closed loop borehole over an open loop borehole includes a reduced risk of freezing within the heat pump and reduced maintenance, as there is no need for any filtration units.

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