Systems and methods for flow control in an hvac system

A method for controlling flow of a fluid through a heat exchanger in a heating, ventilation, or air conditioning (HVAC) system, the method comprising:

• obtaining a temperature differential of the fluid across the heat exchanger;
• comparing the temperature differential to a threshold;
• and
• responsive to the temperature differential being less than the threshold:
• calculating an adjusted setpoint for a flow control device as a function of both the temperature differential and the threshold;
• and
• operating the flow control device to adjust the flow of the fluid through the heat exchanger in accordance with the adjusted setpoint.

A system for controlling flow of a fluid through a heat exchanger in a heating, ventilation, or air conditioning (HVAC) system comprising:

• a pump operable to circulate the fluid within a fluid circuit through the heat exchanger;
• temperature sensors positioned to obtain a temperature differential of the fluid across the heat exchanger;
• and
• a controller configured to:
• compare the temperature differential to a threshold;
• and
• adjust a setpoint for the pump to reduce the flow of the fluid through the heat exchanger responsive to the temperature differential being less than the threshold.