Table of Contents
Advertisement
Siemens Building Technologies
HVAC Products
T
A
25
20
T
AD
15
10
5
0
Progression of the actual, composite and attenuated outside temperature
T
Actual outside temperature
A
T
Attenuated outside temperature
AD
T
Composite outside temperature
AM
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 compensat-
ing variable
• With weather-compensated flow temperature control with room temperature influ-
ence, 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).
Gain factor of room temperature deviation
∆
–
w
Decrease of room temperature setpoint
R
∆
+
w
Increase of room temperature setpoint
R
E
Effect
w
Setpoint minus actual value (room temperature)
–x
R
R
∆
The setpoint change
w
mula:
Factor of room influence E
∆
w
=
R
2
Basic documentation RVD240
12 Function block Space heating
T
A
E
w
- x
R
R
is calculated in the static state according to the following for-
R
× ( w
- x
)
R
R
T
AM
t
41/126
CE1P2384en
27.05.2004
Advertisement
Table of Contents
