Siemens LMU64 Series - Heating curves

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Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en
HVAC Products 3 Functions 07.11.2002
20
30
40
50
60
70
80
90
Sth=2
Sth=10
Sth=20
-20 -15 -10 -5 0 5 10 15 20
Heating curves (standard Siemens), TrSoll = 20 °C
Flow temperature setpoint TvSoll
Composite outside temperature TaGem
7494d14e/0201
Heating curves of LMU...-internal weather compensation (impact of slope)
TvSoll: Flow temperature
TaGem: Composite outside temperature
Sth: Heating curve slope (parameter)
The heating curve describes radiator systems with a radiator exponent of n =1.3 at a
room temperature setpoint of 20 °C. For other systems with n = 1.1, for example, or
different nominal flow / return temperatures, the slope can be appropriately adjusted.
In the case of room temperature setpoint changes, the heating curve is shifted on a 45 °
axis in relation to TvSoll = f (TaGem) graph.
TrSoll = 20 °C
TrSoll = 10 °C
TrSoll = 30 °C
20
30
40
50
60
70
80
90
-20 -15 -10 -5 0 5 10 15 20
Heating curves (standard Siemens), Sth = 15
Flow temperature setpoint TvSoll
Composite outside temperature TaGem
7494d15e/0201
Heating curves of LMU...-internal weather compensation (impact of room temperature setpoint)
Heating curves
Legend