Technical data

38 | Project planning manual for heat pumps for heating and domestic hot water preparation | 01.2012 www.dimplex.de
3.2.4 Brine-to-water heat pump
5. Step: The collector surface is calculated from the pipe
length and the clearance
NOTE
The calculated minimum pipe length is, in practice, rounded up to a full
100 m circuit.
3.2.4 Brine collector and brine circuit manifold installation
Brine circuit manifolds easily and safely connect borehole heat
exchangers or ground heat collectors with heat pumps. In gen-
eral, a water/glycol mixture (brine) is used as the heat transfer
medium. The brine flows from the collectors or heat exchanger
pipes via the brine circuit manifold to the heat pump and back
again via the brine collector in a closed circuit.
The brine collector or brine circuit manifold must be installed de-
pending on the number of brine circuits to be filled (see Fig. 3.4
and Fig. 3.5 ). The collector and the manifold are both equipped
with ball valves with which the individual collector or heat ex-
changer circuits can be completely shut off (e.g. in the event of a
leakage). The PE pipes of the collectors or heat exchangers can
be directly mounted on the ball valves with the premounted
clamping ring fittings.
Fig. 3.4: Mounting a brine circuit manifold with a maximum of 8 circuits
Fig. 3.5: Mounting a brine circuit manifold with a maximum of 16 (2x8) cir-
cuits
Various different points must be taken into account when install-
ing the brine circuit manifold:
 Mount the brine circuit manifold on a duct or building wall
(e.g. using a wall bracket).
 The collector or heat exchanger pipes must be inserted into
the manifold from below in a bend (without tension), so that
it is possible to compensate any length differences occurring
between the summer and winter months (tension cracks).
 Ideally, the bend should be formed using a welding sleeve.
 Outside the building, the brine circuit manifold should be
mounted in accessible ducts - protected against rain water.
 For duct mounting, we recommend covering the collector or
heat exchanger pipes in the ground with approximately 20
cm of sand and/or putting them on a 20 cm sand base. If a
bend is used to compensate any length differences, this
should be placed above ground level in this case.
Fig. 3.6: Mounting the pipework on the brine circuit manifold
Fig. 3.7: Mounting the pipework on the brine circuit manifold with a welding
angle
Collector surface A = L (pipe length) * b (clearance)
The required clearance at a location in southern Germany
is 0.8m. 0.8m is selected
Collector surface A = 600m * 0.8m = 480m²
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