Thermosyphon coolers for cooling systems with cooling towers

A cooling system, comprising:

• a cooling fluid loop configured to circulate a cooling fluid therethrough;
• a thermosyphon cooler disposed along the cooling fluid loop and configured to transfer heat from the cooling fluid to ambient atmosphere through dry cooling, wherein the thermosyphon cooler comprises a refrigerant, wherein the refrigerant is configured to absorb heat from the cooling fluid and to transfer heat to the ambient atmosphere, and wherein the cooling fluid and the refrigerant are not in fluid communication with one another;
• a cooling tower disposed downstream of the thermosyphon cooler along the cooling fluid loop and configured to transfer heat from the cooling fluid to the ambient atmosphere through evaporative cooling;
• and
• a controller configured to:
• receive feedback indicative of a temperature of the cooling fluid exiting the thermosyphon cooler from a temperature sensor;
• compare the temperature of the cooling fluid exiting the thermosyphon cooler to a cooling temperature set point;
• reduce a fan speed of one or more fans of the thermosyphon cooler when the temperature of the cooling fluid exiting the thermosyphon cooler is less than the cooling temperature set point;
• determine an economic efficiency of operation of the one or more fans of the thermosyphon cooler based on a water cost, or an electricity cost, or both when the temperature of the cooling fluid exiting the thermosyphon cooler equals or exceeds the cooling temperature set point;
• increase the fan speed of the one or more fans of the thermosyphon cooler when the economic efficiency of operation of the one or more fans of the thermosyphon cooler exceeds a threshold and when the temperature of the cooling fluid exiting the thermosyphon cooler equals or exceeds the cooling temperature set point;
• and
• reduce the fan speed of the one or more fans of the thermosyphon cooler and initiate operation of the cooling tower when the economic efficiency of operation of the one or more fans of the thermosyphon cooler is less than the threshold and when the temperature of the cooling fluid exiting the thermosyphon cooler equals or exceeds the cooling temperature set point.