Room Controls Flashcards
A simple controller has three input/output signals. Describe these three signals.
Setpoint (SP) or Reference Signal:
Description: This is the desired value or target that the system aims to achieve. It represents the optimal condition or value the controller is trying to maintain.
Process Variable (PV) or Measured Signal:
Description: This is the current value of the system parameter being controlled. It is obtained from sensors or measurement devices.
Control Output (CO) or Manipulated Signal:
Description: This is the signal sent from the controller to the actuator or control element to influence the process.
What is the difference between a CAV and a VAV-system?
CAV:
Air flow: Constant
Operation: Constant, regardless of thermal flow
Less energy efficient
Suitable for medium to small spaces with a homogenous heating/cooling demand
Simple controls
VAV:
Air flow: Variable
Operation: Varying air volume and air temp depending on demands.
More energy efficient
Suitable for larger spaces with zones with varying heating/cooling demands
More complex controls and sensors
What is the purpose of an occupancy sensor?
An occupancy sensor is a device used in building automation systems to detect the presence or absence of people within a space. The primary purposes of an occupancy sensor are:
Energy conservation (due to better control of things like lighting and HVAC)
Convenience and comfort (due to automatization of things like lighting and HVAC)
Better operation (for example, operational schedules for HVAC based on occupancy data)
