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Siemens
Basic Documentation RVP360
CE1P2546en
Building Technologies
9 Function block: Space heating
2017-07-24
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
Room temperature setpoint change
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