Evaporative cycles of concentration control

A cycles of concentration (COC) control process for an evaporative media cooling system having a storage tank in fluid communication with a drain valve and a refill valve, the COC control process including the steps of:

• a) initially filling the storage tank with water to a first level, the water containing non-evaporative solids at a first concentration;
• b) setting a target cycles of concentration setpoint;
• c) setting a refill valve counter value to a zero value;
• d) detecting that some of the water has evaporated from the storage tank down to a second level below the first level, wherein the water has an increased non-evaporative solids concentration as compared to the concentration at initial filling of the storage tank;
• e) refilling the storage tank back to the first level by executing a discrete refill event thereby reducing the non-evaporative solids concentration of the water in the storage tank, the discrete refill event including opening and closing the refill valve to add make-up water to the storage tank;
• f) incrementing upwardly the refill valve counter value by a value of one;
• g) repeating steps d) to f) until the refill valve counter value equals or exceeds the target cycles of concentration setpoint;
• h) executing a discrete drain event in response to determining that the refill valve counter value is greater than or equal to the target cycles of concentration setpoint, the discrete drain event including opening and closing the drain valve to drain water from the storage tank;
• and
• i) subtracting the target cycles of concentration setpoint from the refill valve counter value upon the occurrence of the drain event and returning to step e).