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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 9 Function block: Space heating 15.03.2011
9.5.2 Room influence
The room temperature is included in the control process. Required for that purpose
is a room sensor or room unit.
A gain factor for the room temperature’s influence on flow temperature control can
be adjusted. This gain factor indicates to what extent deviations of the current room
temperature from the room temperature setpoint have an impact on flow tempera-
ture control:
0 = no impact of room temperature deviation on the generation of setpoint
20 = maximum impact of room temperature deviation on the generation of setpoint
The room temperature setpoint change T
Rw
is calculated according to the follow-
ing formula:
VF
T
Rw
[K] = ————— * ( T
Rw
- T
Rx
)
2
T
Rw
T
R
T
Rw
The flow temperature setpoint change T
Vw
resulting from the change of room
temperature setpoint is calculated as follows:
T
Vw
[K] = T
Rw
*
( 1 + s )
s Heating curve slope
T
Rw
Room temperature setpoint
T
Rw
Change of room temperature setpoint
T
Rw
Reduction of room temperature setpoint
+T
Rw
Increase of room temperature setpoint
T
Rx
Actual value of room temperature
T
R
Deviation of room temperature (T
Rw
- T
Rx
)
T
Vw
Change of flow temperature setpoint
VF Gain factor
9.6 Heating curve
9.6.1 Purpose
With space heating systems, flow temperature control is always weather-
compensated. The heating curve assigns the flow temperature setpoint to the pre-
vailing outside temperature.
9.6.2 Settings
The heating curve settings are made via 2 operating lines.
The following settings are required:
Flow temperature setpoint at an outside temperature of 5 °C
Flow temperature setpoint at an outside temperature of 15 °C
38


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