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sizing example
Example:
Air | water heat pump sizing. the
illustration shows the relationship
between the heat demand and the
heating output of the heat pump. the
intersection of the curves provides the
dual-mode point (start of the second
heat source). the dual-mode point
in mono-energetic operation should
lie between an outside temperature
of –3 °C and –7 °C to cover a large
proportion of the annual heat demand
with the heat pump (see table).
Sizing example
the example is a house with a
heat demand of 11.0 kw. the heat
distribution system comprises low
temperature radiators, designed for
55/45 (55 °C flow temp. at –14 °C
outside temperature). the dual-mode
point should be between –3 °C and
–7 °C.
Result:
the required heating output of the
heat pump for an underfloor heating
system and six hours power-oFF
(factor 1.1)
11.0 kw x 1.1 = 12.0 kw.
the wPl 18, that independently covers
a heat demand down to –7 °C outside
temperature and an annual heating
proportion of 98%, was selected.
Annual coverage by the heating heat pump
Dual-mode
point
Parallel (mono-energetic) operation; coverage according to climate zone
°C
–10 °C
–12 °C
–14 °C
–16 °C
–18 °C
– 12
1.00
1.00
1.00
0.99
0.98
– 10
1.00
1.00
0.99
0.98
0.97
– 8
1.00
0.99
0.98
0.97
0.96
– 6
0.99
0.99
0.98
0.97
0.95
– 4
0.99
0.98
0.97
0.95
0.93
– 2
0.98
0.96
0.94
0.92
0.90
0
0.96
0.93
0.90
0.87
0.85
+ 2
0.92
0.88
0.85
0.81
0.77
+ 4
0.87
0.83
0.79
0.74
0.69
+ 6
0.81
0.77
0.72
0.67
0.62
+ 8
0.75
0.71
0.65
0.59
0.52
Air inlet temperature °C
He
ating output (k
w
)
Air | water heat pump sizing, with inverter technology
Air inlet temperature °C
He
ating output (k
w
)
Air | water heat pump sizing, with
inverter technology
these heat pumps are operated in
mono-mode. regulating the speed
matches the heat pump heating
output to the heating load of the
building.
Summary of Contents for Heat pumps
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