Cooling Towers Part 2: Measuring Performance with Range and Approach

There are two terms you need to understand if you want to sound somewhat competent when describing a tower’s performance: Approach and Range.

Range is the temperature difference between the inlet water and the outlet water.

The formula is EWT (95℉) – LWT(85℉) = Range (10℉)

The higher the range, the more efficient the tower.

Approach is the difference between the outlet water temperature and the entering air wet bulb temperature.

The Higher the approach the less efficient the tower.

The formula is LWT (85℉) – WBT (78℉) = Approach (7℉)

Range Approach

Patrick is Zen HVAC’s diagnostic and training guy. Patrick started in the trade the day he left technical school and never looked back. He's served in various technical and training roles in the HVAC industry but specializes in system troubleshooting and diagnostics, retro commissioning, and technical training. His moto: If I can understand it, anybody can. Patrick uses the Zen common sense approach to teach Patrick’s Likes- His Wife, kids and dog. Old pickup trucks. Hiking. The industrial Revolution. Patrick’s Dislikes- Taking work too seriously. Anything unintuitive. Emoticons :( Patrick’s Favorite famous person- Theodore Roosevelt “I am only an average man, But I work harder at it than the average man" Famous Patrick Quote- “Well, that was stupid of me”

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