Configuring The Hybrid Operating Mode Of A Hydraulic Back-Up - DeDietrich ALEZIO O HYBRID User Manual

5 Operation
5.13

Configuring the hybrid operating mode of a hydraulic back-up

Tab.35 Calculating the threshold coefficient of performance
If the coefficient of performance of the heat pump is higher than the threshold coefficient of performance, the heat pump takes
priority. Otherwise only the boiler back-up is enabled. The heat pump coefficient of performance depends on the outside
temperature and the heating water set point temperature.
Hybrid mode Description
(HP061) parame­
ter
HP061 = Hybrid Optimisation of energy costs for the consumer (factory setting): the control system chooses the cheapest
Cost generator according to the coefficient of performance of the heat pump and according to energy cost.
The switch between the heat pump and the boiler occurs at the value of the threshold coefficient of per­
formance calculated according to energy cost optimisation mode with the energy cost parameters.
Peak elec. cost (HP062): Peak rate cost of electricity
Off-peak elec. cost (HP063): Off-peak rate cost of electricity
Gas or oil cost (HP064): Cost of fossil energy (oil or gas) – price per m
0.01 to 2.50 €/kWh
HP061 = Primary Optimisation of primary energy consumption: The control system chooses the generator that consumes the
Energy least primary energy.
The switch between the heat pump and the boiler occurs at the value of the coefficient of performance
threshold COP Threshold (HP054) according to the primary energy consumption optimisation mode.
HP061 = Hybrid Optimisation of CO
CO2
The switch between the heat pump and the boiler occurs at the threshold coefficient of performance value
calculated according to the CO
CO2 coef. elec. CH (HP065): Electricity CO
CO2 coef. elec. DHW (HP066): Electricity CO
CO2 coef. of gas/oil (HP067: Gas or oil CO
HP061 =No No optimisation: The heat pump always starts up first, regardless of the conditions. The boiler back-up
Hybrid starts up afterwards, if necessary.
Fig.29
+
T C
1 S
+
C T
S 1
T
1
40 200 ESL HYBRID
The hybrid function consists of an automatic switch between the heat
pump and the boiler, according to the cost, the consumption or emission of
CO
emissions: The control system chooses the generator that emits the least CO
2
emissions optimisation mode:
2
Influence of outdoor temperatures and bi-valency
C
T
T
2
C
T
T
2
C
T
T C
2 S
MW-5000542-1
of each heat generator.
2
emissions in heating mode
2
emissions in domestic hot water production mode
2
emissions)
2
C COP: Coefficient of performance
C Threshold coefficient of performance
S
T Outdoor temperature
T Min. Outdoor T. HP (HP051) parameter: Minimum outdoor
1
temperature for the heat pump to stop
T Bivalent temperature (HP000) parameter: Bi-valency outdoor
2
temperature
3
or per litre – Can be set from
2
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