Air Heater — Condensate Load

The steam demand, condensate load and trap capacity of a steam-to-air coil.

Unit system

Inputs

Air flow (at inlet conditions)

The fan rating is usually at inlet conditions; the calculation converts it to mass.Air pressure (absolute)

Air inlet temperature

Air outlet temperature

Specific heat of air

Steam pressure (absolute)

Heat transfer efficiency

Safety factor

A factor of 2 is common for air coils, because of freezing and maldistribution risk.

Steam demand = condensate load

217.4kg/h

Heat duty

130.7kW

Trap capacity (with safety factor)	434.8 kg/h
Air mass flow	12,690 kg/h
Inlet air density	1.269 kg/m³
Volume flow at outlet	11,258 m³/h
Steam temperature	133.5 °C
Assessment	Inlet air is above freezing; a standard coil arrangement is adequate.

Only SENSIBLE heat is involved: air being heated does not condense its moisture, and the dew point is unchanged.
Air is treated as an ideal gas. At atmospheric and low pressures the deviation is a fraction of a per cent.

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Results are for engineering pre-assessment and are not a product selection commitment. Final responsibility rests with the user.