Geothermal Heat Products

Heat contained in earth, so called geothermal heat is
usually used indirectly. Heat pumps taking heat from the
ground are called “ground-water“. Heat is extracted using
an underground collector usually MDPE plastic pipes. A
heat carrying liquid is pumped through these pipes
connected to the heat pump evaporator. The heat carrying
liquid is non-freezing and ecologically harmless.
Circulating liquid is cooled down in the heat pump
evaporator and it is re-warmed in the underground
collector by means of geothermal heat. To be the heat
transfer even and constant throughout the heating
period, it is important to make sure a suitable location of
the ground collector and the area large enough to recover
the energy taken out by the heat pump.

Underground collectors can be installed in two ways.
Either as a horizontal collector, set in a depth of 1.5 to 2
m under ground level or as a vertical one set in one or
more boreholes. Bore-holes being significantly deeper
than pipes in shallow trenches are less susceptible to
seasonal temperature changes and the energy available
for the heat pump is more even throughout the heating
season. When compared to an installation using
horizontal collectors, vertical bore-holes and their
collectors experience lower seasonal temperature changes
and earth-water heat pumps can achieve higher COP’s.

Technical Brochure on PZP Earth-Water Heat
Pump.