Watch the fan exhaust. A healthy winter plume is wispy and dissipates quickly. A dangerous plume is thick, heavy, and drifts horizontally without rising. This indicates the water is entering the cold air basin at a temperature too low to melt the ice forming upstream.
Respect the cold. Your tower will thank you in July. cooling tower handbook
Most operators assume that cold weather is a blessing for cooling. After all, if it’s freezing outside, the tower doesn’t have to work as hard to shed heat, right? This is the single most dangerous misconception in wet cooling tower management. Watch the fan exhaust
As ambient temperature drops, the cooling tower’s capacity for heat rejection actually skyrockets. A tower designed to cool 100°F water down to 85°F on a 95°F summer day can easily overcool that same water to 40°F or lower on a 20°F winter night. While this sounds like a performance gain, it leads to the "Ice Paradox": The better the tower performs thermally, the faster it self-destructs structurally. This indicates the water is entering the cold
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