The most common building automation control strategy is the use of feedback control loops. This strategy involves constantly monitoring the conditions in a building, such as temperature and humidity and comparing them to a setpoint. If the conditions deviate from the setpoint, the building automation system (BAS) will adjust the mechanical and electrical systems to bring the conditions back to the setpoint.
For example, in the case of HVAC control, if the temperature in a room is too high, the BAS will turn on the air conditioning to cool the room down. Once the temperature reaches the setpoint, the air conditioning will turn off. This process is known as a ""closed-loop"" control, as the system is constantly monitoring the conditions and making adjustments based on the feedback it receives.
This type of control strategy is widely used and adopted due to its efficiency and flexibility in handling multiple variables and achieving the desired results.
However, depending on the complexity and specific requirements of the building, other control strategies such as predictive control or model predictive control may also be used.