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Product Description
4.3
Heat pump
4.3.1 Functioning and Characteristics
Panasonic has developed the heat pump, as the core of the heat pump system, in three differ-
ent model series. This makes it possible to offer the best possible solution to address individual
heat supply requirements for buildings:
Aquarea LT:
LT
Ideal for low temperature heaters or floor heating; it can also be used for radiators.
Heat pumps
Aquarea
Aquarea T-CAP:
T-CAP
For applications where the nominal power must be maintained even at outside
Heat pumps
temperatures ranging from -7 or -20 °C. Care is taken to ensure that sufficient power
Aquarea
output is always available for heating the house, even at extremely low outside tem-
peratures, even without support from an additional heat source.
Aquarea HT:
HT
For high temperature heaters (e.g. radiators during building restoration), because
Heat pumps
Aquarea HT provides a water supply at a temperature of 65 °C without any support
Aquarea
from other heating systems, even at outside temperatures of -15 °C.
All series - except the HT series - have a cooling function. Moreover, the Aquarea heat pump (all
series) can be used as a compact system in a device or as a split system in two devices (out-
door unit and hydro-module)
(→ 4.5 Model types, p.
4.3.2 Operating mode
In general: The greater the difference between the outside temperature and temperature of the
useful heat, the lower is the performance number of the heat pump. As high temperature differ-
ences seldom occur over the course of the year on properly planned heat pump systems, brief
additional re-heating using E-heating elements is often accepted. As an alternative to an E-heat-
ing element, you can also work with a peak load or alternative heat source, such as a condens-
ing boiler or a fireplace. Four operating modes are distinguished as follows:
● Monovalent Operating mode:
The heat pump serves as the sole heat source.
● Mono-energetic Operating mode:
An energy (power) source is used in various heat sources (electrical heat pump +
E-heating element for peak load).
● Bivalent alternative operating mode:
As an alternative to the heat pump, a second heat source supplies the object using
another energy source (e.g. fireplace instead of heat pump for outside tempera-
tures <-5 °C).
● Bivalent parallel operating mode:
Besides the heat pump, a second heat source is used using another energy
source. Both heat sources are operated simultaneously (e.g. heat pump + con-
densing boiler for outside temperatures <0 °C).
!
IMPORTANT
If the heat pump in combination with an E-heating element is operated mono-energetically, the
E-heating element should cover a maximum of 15% of the heat requirement.
22
Aquarea air-to-water heat pumps - Planning and installation manual - 01/2018
25).
4.4
Heat use
4.4.1 Heating
In contrast with heat sources with burners, which generate water inflow temperatures of
over 80 °C, the maximum water inflow temperature of the Aquarea heat pump is limited to
55 °C (Aquarea LT), 60 °C (Aquarea T-CAP) or 65 °C (Aquarea HT). This must be taken into
consideration during the planning of the heating circuits. Surface heaters and underfloor heating
that have a water inflow temperature of up to 35 °C and a spread of 5 K are recommended.
An advantage of underfloor heating with wet screed laying is its high storage capacity, which
eliminates the need for a buffer tank for bridging power cut-off times by the energy supply
company.
Fan coils have the advantage of good heat emission to the ambient air with quick control
performance. Besides, they can be used for both the heating and cooling modes to the same
extent.
If radiators are used, plan with the lowest possible design temperature of, for example, 45 °C,
to ensure high efficiency of the heat pump system. An internal E-heating element of 3 to 9 kW
with its mono-energetic operating mode ensures high heating comfort of the Aquarea heat pump
even at very low outside temperatures. Alternatively, a bivalent operation is also possible in
combination with an external heat source.
The Aquarea heat pump has an outside temperature-dependent control of the water inflow
temperature and can thus actuate a heating circuit with a room thermostat. The other heating
circuits can be controlled through additional heating circuit controllers or a superordinate system
controller.
4.4.2 Preparation of hot water
The Aquarea heat pump can similarly prepare hot water, and this is integrated in the controls.
It switches to this operating mode when necessary and systematically actuates the tank for the
hot water preparation through a 3-way valve.
For reasons of efficiency, the hot water temperature is set below 60 °C in the heat pump
operation. A hot water temperature of 45 °C is normally sufficient and does not compromise
comfort in any way. If the hot water temperature is, however, too low, there is the risk of
Legionella to be considered; this multiplies particularly well in the range between 30 and 50 °C.
Panasonic hot water tanks are fitted with an electrical heating rod (E-Heating element DHW
tank) for comfortable hot water supply, which is only switched on when needed or for Legionella
prophylaxis (sterilisation).
Aquarea heat pumps can be easily combined without a problem with solar systems, which can
take over hot water provision to a large extent in the summer.
Aquarea air-to-water heat pumps - Planning and installation manual - 01/2018
Product Description
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