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Operating modes
For the different types of heat pump
operation, the heating technology
world uses the following terminology:
Mono-mode
the heat pump is the sole provider
of heating in the building. this
operating mode is suitable for all
low temperature heating systems up
to +60 °C flow temperature.
Mono-energetic
the heating system uses no second
form of energy. the air | water heat
pump operates down to an outside air
temperature of –20 °C. Upon demand,
an electric booster heater is started at
very low outside air temperatures.
HEat pUmp opEratIng modES
Dual-mode - alternative
Down to a fixed outside temperature
(e.g. 0 °C), the heat pump delivers
the entire heating energy. when the
temperature falls below that value,
the heat pump switches itself oFF
and the second heat source takes over
the heating operation. this operating
mode is suitable for all heating
systems up to 90 °C.
Dual-mode - parallel
Down to a certain outside
temperature, the heat pump alone
delivers the required heating energy.
A second heat source starts at low
temperatures. However, contrary
to the dual-mode alternative
operation, the heat pump proportion
of the annual output is higher.
this operating mode is suitable
for underfloor heating systems
and radiators up to +60 °C flow
temperature.
Dual-mode - partially parallel
Down to a certain outside
temperature, the heat pump alone
delivers the required heating energy.
the second heat source starts, if the
temperature falls below that value. the
heat pump is stopped if the heat pump
flow temperature is inadequate. the
second heat source supplies the entire
heating output. this operating mode is
suitable for all heating systems above
60 °C flow temperature.
Illustration of the possible operating modes of a heat pump system
mono-mode
dual-mode -
alternative
dual-mode partially
parallel
dual-mode - parallel,
mono-energetic
Heat distribution system tv < 60 °C
Heat distribution system tv > 60 °C
HP = Heat pump
Qn = Heating load
tU = Changeover point
bV = Dual-mode point
ZH = booster heater
te = booster heater start
Содержание Heat pumps
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