Why Does New Cooling Tower Fill Have Dry Areas After Installation?

Seeing dry areas shortly after installing new cooling tower fill can be confusing. The fill itself may be new and undamaged, yet some sections are not becoming evenly wetted during operation.

Check Water Distribution Before Blaming the Fill

Film fill requires reasonably uniform water coverage to use its available heat-transfer surface. If some areas remain dry, inspect the distribution system first.

Possible causes include partially blocked nozzles, incorrect water flow, damaged distribution pipes, or uneven water coverage across the fill.

Check Fill Installation and Arrangement

Fill blocks should be installed according to the intended arrangement and supported correctly. Incorrect positioning, excessive gaps, or displaced sections can change the designed water and airflow paths.

Compare Wet and Dry Sections

During an inspection, compare a dry area with a normally wetted section. Look for differences in nozzle coverage, fill position, support condition, and water flow.

Why This Matters for Cooling Performance

A dry section means part of the available fill surface is not being effectively used. At the same time, areas receiving excessive water may not compensate for the loss of effective contact area.

Research has also shown that the interaction between fill arrangement and non-uniform water distribution can influence wet cooling tower performance.

When the Fill Is Not the Root Cause

If the new fill dimensions and installation are correct but dry areas remain, the distribution system should be investigated before ordering another batch of fill.

Our team can review installation photos, existing fill dimensions, tower drawings, and water distribution conditions to help determine whether the issue is related to the fill or the cooling tower distribution system. For projects using different tower configurations, TRIPLE-SPAN UNIVERSAL COOLING TOWER INFILL FOR CROSS & COUNTER CURRENT can be considered when the fill arrangement and tower design are compatible.

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