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SMW-XP-50TU - SMW-XP-100TU
1.4 Energy-efficient use of the heat
pump
By operating this heat pump you contribute to the protection of
our environment. A prerequisite for an efficient operation is the
proper design and sizing of the heating system and the heat
source system. In particular, it is important to keep water flow
temperatures as low as possible. All energy consumers con-
nected should therefore be suitable for low flow temperatures. A
1 K higher heating water temperature corresponds to an in-
crease in power consumption of approx. 2.5 %. Low-temperature
heating systems with flow temperatures between 30 °C and
50 °C are optimally suited for energy-efficient operation.
2 Purpose of the heat
pump
2.1 Application
The water-to-water heat pump must be installed in a frost-free,
dry room on an even, smooth and horizontal surface. It can be
used in new or already-existing heating systems. Water is used
as the heat transfer medium. This can be supplied from wells or
other similar water systems.
Neither frost nor temperatures higher than 25 °C must occur in
the installation location at any time of the year.
In order to eliminate the risk of corrosion on the evaporator, the
well water must be evaluated regarding the corrosion behaviour
of metallic materials according to DIN 50930.
Details can be found in the project planning and installation ma-
nual for heat pumps for heating purposes.
ATTENTION!
The well water must comply with the required water quality standards.
2.2 Operating principle
A well pump conveys the water to the evaporator of the heat
pump. There, the heat is transferred to the refrigerant in the refri-
gerating circuit.
The refrigerant is drawn in by the electrically driven compressor,
compressed and "pumped" to a higher temperature level. The
electrical operating power supplied during this process is not lost;
rather it is also mostly absorbed by the refrigerant.
The refrigerant is subsequently passed through the liquefier,
where it in turn transfers its heat energy to the heating water.
The heating water is heated, depending on the operating point,
to a maximum of 58 °C ± 2K.
2.3 Functional description for
integrated thermal energy
metering
The compressor manufacturer's performance specifications for
different pressure levels are stored in the heat pump software.
Two additional pressure sensors for determining the current
pressure level are installed in the refrigerating circuit, one before
and one after the compressor. The current heat output can be
calculated from the compressor data stored in the software and
the current pressure level. The integral for the heat output over
the runtime gives the quantity of thermal energy supplied by the
heat pump, which is displayed separately for heating, domestic
hot water preparation and swimming pool water preparation on
the heat pump manager´s display.
