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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
Heating
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.
Subsequently, the refrigerant is passed through the condenser
where it transfers its heat energy to the heating water. Depend-
ing on the set operating point (thermostat setting), the heating
water is thus heated up to a max. of 60 °C.
Cooling
The functions of the evaporator and the liquifier are reversed in
the "Cooling" operating mode.
The heating water gives up its heat to the refrigerant via the liqui-
fier which is now functioning as an evaporator. The refrigerant is
pumped to a higher temperature level using the compressor.
Heat passes into the brine via the liquifier (evaporator in heating
operation) and consequently into the ground.
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3
Basic Device
The basic device consists of a ready-to-use heat pump for indoor
installation, complete with sheet metal casing, control panel and
integrated controller. The refrigerating cycle contains the refriger-
ant R407C. R407C refrigerant is CFC-free, non-ozone depleting
and non-combustible.
All components required for the operation of the heat pump are
located on the control panel. An external wall temperature sensor
including fixing accessories and a dirt trap are supplied with the
heat pump. The power feed for the load current and the control
current must be installed by the customer.
The supply lead of the brine circulating pump (to be provided by
the customer) must be connected to the control panel. If re-
quired, the supply lead of the brine pump is be equipped with a
motor protection device.
The customer must provide both the collector and the brine cir-
cuit manifold.
1)
Liquifier
2)
Control panel
3)
Compressor
4)
Evaporator
E-3
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