113
www.stiebel-eltron.CoM
Laying of pipes
the plastic pipes are buried at a depth
of 1.2 to 1.5 m in several circuits.
individual pipe circuits should not
exceed 100 m in length, otherwise
larger circulation pumps with a
higher power consumption would
be required. the spacing between
pipes is subject to the soil condition
and should be between 0.6 m and
1.0 m. this prevents any ice radii from
joining up, which would prevent rain
water from soaking through. the
pipes can be buried as part of the
general groundwork when building a
new house. in existing systems, bucket
diggers have also proven useful.
Regulations
the installation of geothermal
collectors may have to be notified to
or permitted by the relevant water
board [check local regulations].
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.
only brine liquids tested and
approved by stiebel eltron are
permissible.
to enable the correct venting of
the ground collector, route all
pipes with a gradient towards the
manifold and collector.
brine changes its volume at different
temperatures; consequently safety
valves and expansion vessels are
required (see Din 4751, sheet 2).
Prior to commissioning, pressure
test the entire geothermal collector
incl. manifolds and connecting
lines after filling the system with
brine mixture.
the installation and operation of
geothermal collectors may require
notification and, in some cases,
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.
geotHeRmal collectoR
Summary of Contents for Heat pumps
Page 97: ...97 www stiebel eltron COM Notes ...
Page 110: ...110 www stiebel eltron COM Notes ...
Page 116: ...116 www stiebel eltron COM Notes ...
Page 124: ...124 www stiebel eltron COM Notes ...
Page 182: ...182 www stiebel eltron COM Notes ...
Page 183: ...183 www stiebel eltron COM Accessories for heating heat pumps ...