Energy-Efficient Use Of The Heat Pump; Purpose Of The Heat Pump; Application; Operation Principle - Dimplex WI 140TUR+ Instructions D'installation Et D'utilisation

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 ef-
ficient operation. 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 is to be used exclusively for the
heating and cooling of heating water. It can be used in new or al-
ready-existing heating systems. Water is used as the heat trans-
fer medium. This can be supplied from wells or other similar
water systems.
Normally, an intermediate circuit must be provided. If a system is
to be operated without an intermediate circuit, a water analysis
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 hea-
ting 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 ma-
nual for heat pumps for heating purposes.
ATTENTION!
The well water must comply with the required water quality standards.

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 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.
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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 refrigerant
is brought to a higher temperature level using the compressor.
Heat is passed on to the well water via the liquefier (which func-
tions 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 before
and after the compressor. The current heat output can be calcu-
lated 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
manager's display.
3

Scope of supply

3.1 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 manager. The refrigerant circuit is hermetically
sealed. It contains the Kyoto protocol approved refrigerant
R410A with a GWP value of 1720. It is CFC-free, does not de-
plete ozone and is non-flammable.
All components required for the operation of the heat pump are
located in the control box. An external wall temperature sensor
including fixing accessories, a dirt trap and a flow rate switch, is
supplied with the heat pump. The voltage supply for the load and
control current must be provided by the customer.
The well water pump (to be provided by the customer) must be
controlled via the switch box. It must be equipped with a motor
protection device, if required.
The customer must provide hydraulic components for the well
water circuit.
3.1
E-3