Factory Utilities
Every kilogram of water the plant evaporates also removes about 2,450 kJ from the air. Humidification is a cooling system whether it was sized as one or not.
— L/h
Moisture the air must actually absorb
Saturation humidity is strongly temperature dependent, so take it from a psychrometric chart at the actual dry bulb rather than a nominal figure. Machine heat, lighting and solar gain all add to the load the same plant has to absorb, and none of them appear in a pure moisture balance.
Textile HVAC Humidification Water & Air Ratio Calculator — free, with the formula and a worked example, at Textile School.