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Siemens Building Technologies Basic Documentation RVD110, RVD130 CE1P2381E
HVAC Products 11 Function block Space heating 27.05.2004
T
A
(B9)
2381B04
T
A
T
AD
T
AM
25 / 50 %
75 / 50 %
k
t
= 21 h
Generation of composite and attenuated outside temperature
0
5
10
15
20
25
T
AD
T
AM
t
2522D17
T
A
T
A
Progression of actual, composite and attenuated outside temperature
T
A
Actual outside temperature
T
AD
Attenuated outside temperature
k
t
Building time constant
T
AM
Composite outside temperature
t Time
11.2.2 Room temperature
The room temperature is considered by the control as follows:
• With room temperature-compensated flow temperature control, the deviation of the
actual room temperature from the setpoint is the only compensating variable
• With weather-compensated control with room temperature influence, the room tem-
perature is an additional compensating variable
It is possible to adjust a gain factor for the influence of the room temperature (operating
line 70). This gain factor indicates to what extent a room temperature deviation will
affect the room temperature setpoint, thereby acting indirectly (via the heating curve
slope) on the flow temperature control:
0 = no effect of the room temperature deviation on generation of the setpoint
20 = maximum effect of the room temperature deviation on generation of the setpoint
For that purpose, a room temperature sensor (room unit) must be present.
2462D05
w
R
- x
R
E
Gain factor of room temperature deviation
–∆w
R
Reduction of room temperature setpoint
+
∆w
R
Increase of room temperature setpoint
E Authority
w
R
-x
R
Setpoint minus actual value (room temperature)
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