Heat Pumps
Ground Source Heat
At depths of more than 10m, the ground has a relatively constant temperature of 10°C
all-year round. By embedding pipework in the ground, this huge heat potential can be used
for cooling during the summer and for heating during the winter.
There are two options for using ground-source heat: use of horizontal probes (see picture)
or use of vertical probes. Vertical probes are inserted into boreholes that are drilled
to depths of 40-150m (depending on the local geology). The ground heat is extracted from
the immediate surroundings of the probe with a circulating transfer fluid (usually water and
propylene glycol). The number of probes is determined by the power required for heating or
cooling.
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