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8.4.2. Fundamentals
8.4.2.1. With a room temperature sensor
8.4.2.2. Without a room temperature sensor
8.4.3. Process
8.4.4. Room model temperature
Siemens Building Technologies
Landis & Staefa Division
It is possible to select or set:
•
The type of optimization: either with a room temperature sensor/room unit or based on
the room model
•
The maximum limit value for the heating-up time
•
The maximum limit value for optimum shutdown
•
Quick setback: yes or no
To perform the optimization function, the controller makes use of the actual room tem-
perature – acquired by a room temperature sensor or room unit – or the room model.
Using a room temperature sensor or room unit, it is possible to have optimum start con-
trol and optimum stop control. To be able to optimally determine the switch-on and
switch-off points, optimization needs to "know" the building's heating up and cooling
down characteristics, always in function of the prevailing outside temperature. For this
purpose, optimization continually acquires the room temperature and the respective
outside temperature. It captures these variables via the room temperature sensor and
the outside sensor and continually adjusts the forward shift of the switching points. In
this way, optimization can also detect changes made to the building and to take them
into consideration.
The learning process always concentrates on the first heating period per day.
When no room temperature sensor is used, the room model only allows optimum start
control.
Optimization operates with fixed values (no learning process), based on the set maxi-
mum heating up time and the room model.
T
Rw
T
Rw
T
Rw
T
Rw
Hp
Heating program
t
Time
t1
Forward shift for early shutdown
t2
Forward shift for start of heating-up
t3
Quick setback
T
Setpoint
Rw
To ascertain the room temperature generated by the room model, a distinction must be
made between two cases:
Basic Documentation RVL470
Function block "Space heating"
T
Rx
T
Room temperature setpoint of NORMAL heating
Rw
T
Room temperature setpoint of REDUCED heating
Rw
∆T
Setpoint boost (only with boost heating)
Rw
T
Actual value
Rx
TR
Room temperature
HP
CE1P2522E / 30.03.2000
21/68
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