STIEBEL ELTRON Heat pumps, Technical Manual

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ExamplE 1: brInE | watEr HEat pUmp
Diagram system expenditure of energy value ep
System description
brine | water heat pump wPF with 100
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.
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
brine | water powered by electricity.
Example:
Annual heat demand
60 kwh/m² p.a.
Heated living space 200 m²
Result:
system expenditure of energy value =
1.04
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 1.42 1.17 1.08 1.04 1.01
50 1.31 1.09 1.02 0.98 0.96
60 1.22 1.04 0.98 0.95 0.92
70 1.16 1.00 0.94 0.93 0.90
80 1.11 0.96 0.91 0.89 0.87
90 1.07 0.94 0.89 0.87 0.86
Underfloor heating
system
Ground
Heated available area in An in m²
sys
tem e
xpendit
ur
e of ener
gy
v
alue e
p