Systems and methods for controlling a refrigeration system

A refrigeration system, comprising:

• a heat exchanger configured to place a cooling fluid in a heat exchange relationship with a working fluid;
• a free-cooling circuit comprising a pump, wherein the pump is configured to circulate the working fluid through the heat exchanger and a coil of the free-cooling circuit;
• a sensor configured to detect a temperature of the working fluid or an ambient temperature;
• and
• a controller configured to:
• receive, from the sensor, temperature data indicative of the temperature of the working fluid or the ambient temperature;
• and
• ensure that the temperature of the working fluid is maintained above a threshold temperature at which the working fluid would cause the cooling fluid to freeze by adjusting, based on the temperature data, a speed of the pump of the free-cooling circuit.

A refrigeration system, comprising:

• a heat exchanger configured to place a cooling fluid in a heat exchange relationship with a working fluid;
• a free-cooling circuit comprising a valve, wherein the valve is configured to control a first flow rate of the working fluid directed to a coil of the free-cooling circuit or a second flow rate of the working fluid that bypasses the coil of the free-cooling circuit;
• a sensor configured to detect a temperature of the working fluid or an ambient temperature;
• and
• a controller configured to:
• receive, from the sensor, temperature data indicative of the temperature of the working fluid or the ambient temperature;
• and
• ensure that the temperature of the working fluid is maintained above a threshold temperature at which the working fluid would cause the cooling fluid to freeze by adjusting, based on the temperature data, a position of the valve.