Systems and methods for flow control in an hvac system

A heating, ventilation, and air conditioning (HVAC) system comprising:

• a coil that facilitates heating or cooling;
• a valve that controls flow of a liquid through the coil;
• a pump that provides the liquid at an inlet of the valve;
• an actuator that controls a position of the valve;
• and
• a controller comprising a processor and a memory, the memory comprising a control application that, when executed by the controller, causes the controller to:
• receive a first temperature measurement associated with an inlet of the coil;
• receive a second temperature measurement associated with an outlet of the coil;
• calculate a difference between the first temperature measurement and the second temperature measurement;
• determine that the difference between the first temperature measurement and the second temperature measurement is below a threshold;
• and
• adjust a setpoint associated with the valve.

A flow control device for use in a heating, ventilation, and air conditioning (HVAC) system, the device comprising:

• a valve that controls flow of a liquid through a coil;
• an actuator that controls a position of the valve, the actuator comprising a processor and a memory, the memory comprising a control application that, when executed by the actuator, causes the actuator to:
• receive a first temperature measurement associated with an inlet of the coil;
• receive a second temperature measurement associated with an outlet of the coil;
• calculate a difference between the first temperature measurement and the second temperature measurement;
• determine that the difference between the first temperature measurement and the second temperature measurement is below a threshold;
• and
• adjust a setpoint associated with the valve.