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LoadCairn / Cooling & Airflow

Humidification Load

Estimate the water rate needed to bring outdoor ventilation air to an indoor design humidity target. Edit any condition to recalculate the planning estimate in your browser.

Design inputs

Outside-air flow has no preset value. Enter a design CFM to calculate the result.

Required. Enter the design ventilation airflow; no flow value is assumed.

Outdoor design condition

Outdoor air temperature at the selected design condition.

Enter relative humidity from 0 to 100 percent.

Indoor target condition

Desired indoor air temperature.

Enter relative humidity from 0 to 100 percent.

Browser calculation · works offline after the page is cached

Live planning estimate

Required humidification water

Enter outside-air flow in CFM to calculate the water rate.

Water required
—
lb/hr
Equivalent flow
—
gal/hr
Daily equivalent
—
gal/day

Assumptions & limits

  • Sea-level pressure: 101,325 Pa.
  • Ventilation air only — infiltration and internal moisture gains/losses excluded.
  • Standard-air density basis: 0.075 lb/ft³.

Estimates for planning only, not a substitute for a licensed engineer's design or manufacturer data.

The inputs and calculation run locally in your browser. No network calculation service is used; the installed app can recalculate after this page has been cached.

Method / transparent calculation

Step-by-step trace

Enter a valid outside-air flow to see the input values and step-by-step calculation.