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How much air is needed to evaporate 80 kg of water per hour

To evaporate 80 kg of water per hour by heating outside air from 15 °C to 60 °C with an outlet at 70 %, about 870 kg of air per hour (about 830 m³/h) and about 69 kW of heat are needed, of which about 54 kW goes into the evaporation itself.

Parameters

Result

Approximate calculation using a simplified model: for designing equipment and process modes, consult a technologist.

Calculation example

What we calculate
Air and heat for drying
Outside air temperature
15 °C
Outside air humidity
70 %
Dryer temperature
60 °C
Air humidity at the dryer outlet
70 %
Water to evaporate
80 kg/h
Air required
826 m³/h
Air required (dry mass)
865 kg/h
Thermal power (heating and evaporation)
69,1 kW
Air per 1 kg of water
10,8 kg
Heat per 1 kg of water
0,86 kWh

Frequently asked questions

How to reduce heat consumption for drying?
Recirculate part of the air, preheat fresh air with exhaust heat and raise the temperature if the product allows it.

The calculations are approximate: they help to assess the process and compare options, but do not replace a process design and trials on a specific raw material. This section is for reference only and contains no commercial offers.