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2
Purpose of the Heat
Pump
2.1 Application
The brine-to-water heat pump is designed for use in existing or
newly built heating systems. Brine is used as the heat transfer
medium in the heat source system. Borehole heat exchangers,
ground heat collectors or similar systems can be used as the
heat source.
2.2 Operating Principle
The heat generated by the sun, wind and rain is stored in the
ground. This heat stored in the ground is collected at a low tem-
perature by the brine circulating in the ground heat collector, the
borehole heat exchanger or a similar system. A circulating pump
then conveys the "heated" brine to the evaporator of the heat
pump. There the heat is given off to the refrigerant in the refriger-
ating cycle. This cools the brine so that it can once again absorb
thermal energy in the brine circuit.
The refrigerant is drawn in by the electrically driven compressor,
compressed and "pumped" to a higher temperature level. The
electrical power needed to run the compressor is not lost in this
process. Most of it is absorbed by the refrigerant.
The refrigerant subsequently passes through the liquifier where it
transfers its thermal energy to the heating water. Depending on
the set operating point (thermostat setting), the heating water is
thus heated up to a max. of 60 °C.
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3
Basic Device
The basic device consists of a ready-to-use heat pump for indoor
installation in a compact design. In addition to the control panel
with integral controller, the device is already equipped with all of
the most important components of the heating circuit and the
brine circuit:
Expansion vessel
Circulating pumps
Pressure relief valves
Pressure gauge
Overflow valve (heating circuit)
The refrigerating cycle contains the refrigerant R407C. R407C
refrigerant is CFC-free, non-ozone depleting and non-combusti-
ble.
All components required for the operation of the heat pump are
located on the control panel. The power feed for the load current
and the control current must be installed by the customer.
The customer must provide both the collector and the brine cir-
cuit manifold.
1)
Control panel
2)
Circulating pumps
3)
Liquifier
4)
Compressor
5)
Evaporator
6)
Expansion vessel
3
E-3
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