STIEBEL ELTRON Heat pumps, Technical Manual

Page: 9 / 260

9 www.stiebel-eltron.CoM
EnErgy SoUrcES for HEat pUmpS
Heat source ground with geothermal
collector
At a depth of 1.2 to 1.5 m, the ground
remains warm enough, even on
colder days, to enable an economical
heat pump operation. However, this
requires the availability of a property
large enough to accommodate a
pipe system for collecting the heat
from the ground. in dry, sandy soil,
the collector can extract between 10
and 15 w/m² and up to 40 w/m² in
ground that carries groundwater.
An environmentally-friendly brine
mixture that cannot freeze and which
transports the yielded energy to
the heat pump evaporator courses
through the pipes. As a rule of thumb,
you would need approximately
two to three times as much ground
area as area to be heated. if your
property is large enough, you have an
inexhaustible reserve of energy and
ideal conditions for a stiebel eltron
brine | water heat pump.
Heat source ground with geothermal
probe
Geothermal probes that are set up
to 100 metres deep into the ground
by specialist drilling contractors,
require less space. Geothermal probes
comprise a probe foot and endless,
vertical probe pipes made from
plastic. As with geothermal collectors,
a brine mixture that extracts heat from
the ground circulates through the
plastic pipework. the extraction rate is
subject to the ground characteristics,
and generally lies between 30 and
100 w per metre geothermal probe.
subject to heat pump and ground
conditions, several geothermal probes
can be linked up in a single system.
these systems must be notified to and
possibly approved by your local water
board.
Main layout geothermal probe heat source system
Main layout geothermal collector heat pump system