t h e
p o w e r
f a m i l y
(C) IDM ENERGIESYSTEME GMBH
Montážní návod
Terra SW
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Heat source
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5.1. Brine surface collector
5.1.1.
Popis
With this system, plastic pipes Ø25 x 2.3 mm with a
length of 100m each are laid to extract the heat from
the earth. Depending on the heat pump size, multiple
pipe circuits are required. The brine medium circulates
in these pipes. The heat exchange between the brine
medium and refrigerant takes place in the evaporator
set (stainless steel plate heat exchanger).
5.1.2. Scope of deliver y
In the scope of delivery of a surface collector are
depending on the model, plastic pipes and a connec-
tion unit with distributor.
The provided flexible connection hoses, have to be
implemented to avoid sound transmissions. The
connection pipes between distributor and heat pump
have to be onsight, but no zinc coated pipes have to
be used.
Notes:
-
Only antifreeze approved by IDM-Energiesysteme
GmbH are permitted for use.
-
Brine circuit lines must be fitted with steam
diffusion-proof insulation to protect against con-
densation and ice formation (e.g. Armaflex).
-
When filling the brine circuit with antifreeze mix
-
ture, the expansion vessel must be filled (due to a
reduction in volume when cooling in operation).
- The mixing ratio of the brine medium has to be
chosen for -15° C (=30% antifreeze ratio) If to
much antifreeze is mixed , the specific heat capac
-
ity of the brine medium sinks.
The possible heat loss depends on the soil condi-
tions.
Basically valid is that: in dry soils the heat loss
capacity goes down, in humid soils it goes up. For
1 kW heating output of the heat pump you need
30-40m
2
soil.
The specified surface area required for ground
heat pumps relates to the average earth quality
(soil, clay). With poor quality earth (gravel), the
necessary line length and thus also the surface
area should be increased and the pipes embedded
in fine-grain sand (cable sand 0.3 to 0.5mm).
- Contact your IDM partner for more information on
this.
According to the different types of house building
and the different installation locations of the heat
pumps different pipe lengths from the distributor of
the surface collector to the heat pump.
The pressure loss in the brine pipes is rising as a
result of sinking temperature and rising portion of
monopropylenglykol, at the mixture of the brine
use the recommended concentration.
5. Heat source
Concentration of the brine ratio
Rela
tiv
e pr
essur
e loss
Pressure loss by -5°C
Pressure loss by 0°C
In many countries the geothermal usage
has to be authorized by the water right
authority. An accordingly request has to
be done in time.
