Cooling-Tower Approach Temperature

What this topic covers

Why cold-water temperature is compared with entering-air wet-bulb temperature.

Core thermal ideas

Evaporative cooling is constrained by wet-bulb temperature rather than dry-bulb temperature alone.

Approach is the difference between leaving tower water temperature and entering-air wet-bulb temperature.

A smaller approach generally requires more tower capability or favourable operating conditions.

System tradeoffs

Wet-bulb temperature constrains evaporative cooling, while airflow, fill condition and water distribution affect approach.

What to monitor

Water treatment, biological control and drift management are specialist programs and chemical recipes are intentionally excluded.

Lifecycle perspective

Resource performance should consider fan power, pump power, water makeup and blowdown together.