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Laying of pipes
the plastic pipes with a diameter
of 25 x 2.3 mm are run into the
ground with a maximum length/
depth of 60 metres. specialist drilling
contractors install these probes.
A 50 m deep geothermal probe
comprises 200 metres of Pe pipe
(2 x 50 m flow pipe and 2 x 50 m
return pipe).
Regulations
Geothermal probe systems with a
depth of up to 100 m may have to be
notified to and possibly be permitted
by your local water board. At depths
> 100 m, a higher authority may need
to give its permission.
Installation information:
the manifolds and collectors
should remain accessible for
subsequent modifications, e.g.
in their own distribution ducts or
cellar light well outside the house.
Use only pipes and fittings made
from corrosion-resistant materials.
insulate all lines inside the
house and all wall outlets with
vapour diffusion-proof materials
to prevent condensation, as the
flow and return lines transport
brine that is colder than the cellar
temperature.
Provide appropriate facilities for
filling the system.
First mix the brine concentrate
with water, then fill the mixture
into the heat source system.
geotHeRmal pRobes
only brine liquids tested and
approved by stiebel eltron are
permissible.
to enable the correct venting of
the geothermal probes, route all
pipes with a gradient towards the
manifolds and collectors.
brine changes its volume at
different temperatures; consequently
safety valves and expansion vessels
are required (with reference to
Din 4751, sheet 2).
Prior to commissioning, pressure
test the entire geothermal probe
system, incl. distributor and
connecting lines after filling the
system with brine mixture.
the installation and operation
of geothermal probe systems
may require permits from the
appropriate authorities.
Adding antifreeze to water
changes the viscosity of the heat
transfer medium. the brine
becomes more viscous with
an increasing proportion of
antifreeze. this has implications
for the sizing of the pump and the
brine flow rate. Viscosity has a
strong influence on the pressure
drop (via the coefficient of friction);
take this into account when sizing
the pump (correction factor 1.5).
when selecting the pump, ensure
that only cast pumps (condensate
forming between the casing and
the stator) or rotary pumps are
used.
Summary of Contents for Heat pumps
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