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Siemens Building Technologies
Basic Documentation RVD230
CE1P2383en
HVAC Products
12 Function block Space heating
27.05.2004
0
5
10
15
20
25
T
AD
T
AM
t
25
22
D1
7
T
A
T
A
Progression of the actual, composite and attenuated outside temperature
TA
Actual outside temperature
T
AD
Attenuated outside temperature
T
AM
Composite outside temperature
t Time
12.2.2 Room
temperature
The room temperature is included in the control process as follows:
•
With room temperature-compensated flow temperature control, the deviation of the
actual room temperature from the room temperature setpoint is the only compensating
variable
•
With weather-compensated flow temperature control with room temperature influence,
it is an additional compensating variable
The gain factor for the room temperature influence can be adjusted (operating line 70).
This factor indicates to what extent a deviation in the room changes the room tempera-
ture setpoint, thus having an indirect impact (via the slope) on the flow temperature
control:
0 = room temperature deviations have no impact on the generation of the setpoint
20 = room temperature deviations have a maximum impact on the generation of the
setpoint
A room temperature sensor is mandatory (room unit).
246
2
D
05
w
R
- x
R
E
Gain factor of room temperature deviation
–
∆
w
R
Decrease of room temperature setpoint
+
∆
w
R
Increase of room temperature setpoint
E Effect
w
R
-
x
R
Setpoint minus actual value (room temperature)
The setpoint change
∆
w
R
is calculated in the static state according to the following
formula:
Room influence factor E
∆
w
R
=
2
× (w
R
-
x
R
)
