Wet-bulb is the ceiling?

Yes — evaporative cooling cannot reduce inlet air below the outside wet-bulb temperature. In humid climates the ΔT achievable is smaller than in dry climates.

3 L/min per m² of pad is typical operating flow; you'll also carry bleed-off for water quality management.

Cooling

Evaporative cooling — pad and water sizing.

Compute pad face area, indicative water flow and expected ΔT from tunnel-fan cfm and outside conditions.

Inputs

Total tunnel cfmPad thickness (inches)Outside dry-bulb (°C)Outside wet-bulb (°C)Wet-bulb sets minimum achievable inlet air temperature.

Results

Pad face area: 220.2 m²
Pad efficiency: 75%
Inlet air ΔT: 10.5 °C
Water flow: 661 L/min

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FAQ

Common questions

Wet-bulb is the ceiling?: Yes — evaporative cooling cannot reduce inlet air below the outside wet-bulb temperature. In humid climates the ΔT achievable is smaller than in dry climates.
Water use?: 3 L/min per m² of pad is typical operating flow; you'll also carry bleed-off for water quality management.