Ground Source Heat Pumps

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What is a Ground Source Heat Pump


Ground Source Heat pumps loopsGround source heat pumps use the natural solar energy stored in the earth as a heat source. They efficiently produce around four times as much heat energy for every unit of electricity they use. Energy is harvested from the ground using ground loops or bore holes.

Ground Loops for Ground source heat pump

A continuous length of pipe is buried underground at a depth of between 1 and 2 metres. Heat from the ground is exchanged by the collector and delivered into the home by the heat pump.

The coil of pipe can be laid horizontally or vertically depending upon the length of pipe required and the available land space.

Bore hole system for Ground Source heat pumpsGround Source heat pumps with a Bore Hole

Ground source heat pumps with a bore hole drilled to a depth of around 50m to 200m and the collector is fed into the hole. This method is suited to locations where there may not be enough land space available for ground loops.

Depending upon the size of the building, more than one bore hole maybe required to extract enough heat from the ground.

In the summer, the process can be reversed so the heat pump extracts heat from the building and transfers it to the ground. Transferring heat to a cooler space takes less energy, so the cooling efficiency of the heat pump gain benefits from the lower ground temperatures.

Ground Source heat pumps by Green Systems Engineering