Cooling Tower Complete Calculations Package With Examples

Cooling Tower Design 101 All Calculations in One Place

Perfect for engineers working in pharma, chemical, HVAC, or utilities - here's your complete cheat sheet

1. Range

Formula: Range = Hot water temp - Cold water temp

Example: 42°C 32°C = 10°C

2. Approach

Formula: Approach = Cold water temp - Wet bulb temp

Example: 32°C - 29°C = 3°C

3. Cycle of Concentration (COC)

Formula: COC = TDS in circulating water / TDS in

makeup water

Example: 1800 ppm / 600 ppm = 3

4. Evaporation Loss

Formula: Evap = 0.00085 × Circulation Rate × Range

For 500 m³/hr and 10°C

Evap = 0.00085 x 500 x 10 = 4.25 m³/hr

5. Blowdown Loss

Formula: Blowdown = Evaporation / (COC - 1)

4.25/(3-1) = 2.125 m³/hr

9. Sump Volume (Water Level)

Formula: Sump = Retention Time (min) x Flow Rate ÷

60

5x50060 = 41.67 m³

10. Cooling Tower Capacity

Formula: Flow (m³/hr) = TR x 0.154

For 760 TR 760 x 0.154 = 117.04 m³/hr

Quick Summary Table

Parameter Formula / Value Example Value

Range: Hot temp - Cold temp 10°C

Approach: Cold - Wet bulb temp 3°C

COC: TDS ratio 3

Evaporation: 0.00085 × Flow × Range 4.25 m³/hr

Blowdown: Evap / (COC-1) 2.125 m³/hr

Drift Loss: 0.001 x Flow0.5 m³/hr

Side Stream Filter: 5% of Flow 25 m³/hr

Backwash: 3% of Side Stream0.75 m³/day

Sump Volume: (5 min x Flow) / 60 41.67 m³

Cooling Capacity: TR × 0.154 117.04 m³/hr.

Engineers, let's move beyond theory and apply these in real-world systems.

Drop a if you've used these in your plant!

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