Installation manual

204
9.2.3
9.2.3 Oil heating - parallel bivalent heat pump heating system
Annual heat output:
The percentage covered by the heat pump (see chapter
Selection and Design of Heat Pumps) is primarily dependent on
the selected bivalence point (e.g. – 5 °C) .
Annual performance factor:
This is dependent on the type of heat pump and the way it is
integrated in the heating system. An approximate calculation of
the annual performance factor can be made using the method
shown in Chap. 9.3 on p. 205.
Heat requirement kW
Q
a in kW m
2
Residential floor space Specific heat requirement
Specific heat requirement of Qh = 0,05 kW/m² (good insulation)
= 0,10 kW/m² (poor insulation)
Annual energy Annual energy requi- h kwh
requirement rement Qa in kWh/a a a
Heat requirement Annual full utilisation
hours
e.g. 2000 h/a
kWh
a
Oil requirement Oil requirement Annual energy requirement Qa l
in l/a a
*
Lower heating value Annual utilisation level
Oil: 10,08 kWh/l e.g. = 0,75
Bivalent operating kWh
mode a
Annual energy requirement Qa
Energy requirement H
P
kWh
in kWh/a a
Annual heating performance
Share of HP
Annual energy factor β
e.g. 97%
Annual energy requirement Qa
Oil consumption l
additional heating a
kWh
( 1 - fm )
a Part of heating with oil (e.g. 10%)
Lower heating Annual utilisation
value Hu level
Cost calculation l € €
Oil costs ala
Oil requirement
Oil price
Oil costs additional kWh € €
heating bivalent ax l a
mode
Oil cinsumption additional heating Oil price
Energy requirement
Energy costs
kWh €
€€
system bivalent =
a kWh
aa
mode
Pompe à chaleur Power price Oil costs for
Energy requirement additional heating
kWh
€€
a kWh a
Oil costs Energy costs system
=
kW
Heat requirement =
m
2
*
kW*
=
=
=
= x
x
=
=
=
x
-
=
= =x
=
=
x
- =
Savings
+x
=