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ExamplE 2: aIr | watEr HEat pUmp
Diagram system expenditure of energy value ep
System description
Air | water heat pump wPl with 200
litre buffer cylinder and 300 litre DHw
cylinder
DHW heating
Centralised provision; no DHw
circulation; distribution outside the
thermal envelope; indirectly heated
cylinder; installation outside the
thermal envelope; heating heat pump
brine | water powered by electricity;
peak load: electric heater rod.
Ventilation
no mechanical ventilation.
Central heating
integral heating surface (e.g.
underfloor heating system);
individual room regulation with
two-point controller, switching
differential Xp=2 K; heating system
design 35/28 °C; centralised system;
horizontal distribution outside the
thermal envelope, lines running
internally; regulated pump; buffer
cylinder installed; installation outside
the thermal envelope; heating
heat pump air | water powered by
electricity. electric heater rod.
Example:
Annual heat demand
60 kwh/m² p.a.
Heated living space 200 m²
Result:
system expenditure of energy value =
1.31
System layout
Diagram system expenditure of energy value e
p
Annual
heating
demand
Heated available area in A
n
in m²
kwh/m² p.a.
100
200
300
400
500
40
1.72
1.44
1.35
1.30
1.27
50
1.60
1.37
1.29
1.25
0.23
60
1.52
1.31
1.25
1.23
1.20
70
1.46
1.28
1.22
1.20
1.17
80
1.41
1.25
1.20
1.18
1.16
90
1.37
1.23
1.18
1.16
1.14
Underfloor heating
system
Air
Heated available area in An in m²
sys
tem e
xpendit
ur
e of ener
gy
v
alue e
p
Summary of Contents for Heat pumps
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