Energy-Efficient Use Of The Heat Pump; Purpose Of The Heat Pump; Application; Operation Principle - Dimplex WI 140TUR+ Installation And Operating Instruction

WI 140TUR+
1.4 Energy-Efficient Use of the Heat
Pump
By operating this heat pump you contribute to the protection of
our environment. The heating or cooling system and the heat
source must be properly designed and dimensioned to ensure
efficient operation. In particular, it is important to keep water
flow temperatures as low as possible. All energy consumers
connected should therefore be suitable for low flow tempera-
tures. A 1 K higher heating water temperature corresponds to
an increase in power consumption of approx. 2.5 %. Low-tem-
perature heating systems with flow temperatures between
30 °C and 50 °C are optimally suited for energy-efficient opera-
tion.
2

Purpose of the Heat Pump

2.1 Application

The water-to-water heat pump is to be used exclusively for the
heating and cooling of heating water. 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 simi-
lar water systems.
Normally, an intermediate circuit must be provided. If a system
is to be operated without an intermediate circuit, a water analy-
sis must be carried out, irrespective of the legal stipulations, in
order to establish conclusively whether the ground water is
compatible with the heat pump's evaporator (compare "Heat
pumps for heating purposes" project planning and installation
manual).
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
manual for heat pumps for heating purposes.
ATTENTION!
The well water must comply with the required water quality
standards.
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2.2 Operation principle

Heating
A well pump conveys the water to the evaporator of the heat
pump. There, the heat is transferred to the refrigerant in the re-
frigerating circuit.
The refrigerant is drawn in by the electrically driven compres-
sor, 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.
Cooling
The functions of the evaporator and the liquifier are reversed in
the "Cooling" operating mode.
The heating water transfers its heat to the refrigerant via the liq-
uefier, which is now functioning as an evaporator. The refriger-
ant is brought to a higher temperature level using the compres-
sor. Heat is passed on to the well water via the liquefier (which
functions as an evaporator in heating operation).
In cooling operation, it must be ensured that the minimum well
water inlet temperature does not exceed 10 °C.
ATTENTION!
The locally valid water regulations concerning the heating of
ground water must be observed.
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 be-
fore and 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, do-
mestic hot water preparation and swimming pool water prepa-
ration on the heat pump manager's display.
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