Room Temperature Control And Actuating Variables; Control Algorithms, Control Circuits And Calculation Of Actuating Variable - Gira 2100 Series Manual

instabus KNX/EIB System
Sensor
2.3

Room temperature control and actuating variables

2.3.1

Control algorithms, control circuits and calculation of actuating variable

A comfortable temperature control for a living space requires a special control algorithm which controls the
installed heating or cooling systems. By considering the setpoint temperatures as well as the actual room
temperature, the controller determines the actuating variables controlling the heating or cooling system.
The control system (control circuit) consists of the room temperature controller, the servo drive or the switching
actuator (for the use of electro-thermal drives), the actual heating or cooling element (e.g. heaters or cooling
ceiling) and the room. This results in the following control process:
Room temp. controller
Set value
+
temperature
-
The controller measures the actual temperature (determined room temperature) and compares it with the given
setpoint temperature. The control algorithm calculates the actuating variable from the difference between actual
and setpoint temperature. This enables the controller to compensate for actual/setpoint temperature differences in
the control circuit caused by external influences (e.g. strong exposure to sun or varying outside temperatures) by
regularly readjusting the actuating variable. In addition, the flow temperature of the heating and cooling circuit
affects the control process making it necessary to adapt the actuating variables.
The room temperature controller allows the option between a continuous or switching proportional/integral control
(PI) or a switching 2-state control.
36/82 Page 2100-xx/2101 xx
Control Actuator/
algorithm ETA
Sun radiation,
outside temperature, ...
Radiator/
cooling Room
ceiling
07 /17
Subject to change without notice
Room
temperature