Ground Loops

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Photo supplied by Next Energy.

The ground loop exchanges heat between the earth and the building heat pump.

Open loops

The system brings water from one location, passes it through the heat exchange process at the heat pump, and then discards it in another location.

Closed loops

The system consists of a sealed plastic pipe, filled with a working fluid that is continuously circulating, without ever directly contacting the soil. The closed loops can be installed horizontally, vertically or as a spiral in the soil to ensure the proper length for heat transfer. They can also be submerged in a water source (e.g. lake, pond).

Direct exchange

The working fluid circulates in a closed loop through copper tubing placed in the ground, exchanging heat directly with the soil. This simplicity removes the need for plastic piping, and requires less buried tubing.