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# Steam Heating Air

## Calculate steam heated air systems.

Steam is often used to heat air. Steam condensing rate for air heating equipment can be calculated as

ms = q dt cp ρ / he                               (1)

where

ms = rate of condensation, steam consumption (kg/s)

q = volumetric air flow rate (m3/s)

dt = temperature difference in air flow (oC)

cp = specific heat of air (kJ/kg oC)

ρ = density air (kg/m3)

he = specific enthalpy of evaporating (condensation) steam (kJ/kg)

### Example - Heating Air with Steam

1 m3/s of air is heated from 10oC to 30oC with steam condensing at atmospheric pressure. The steam consumption can be calculated as

ms = (1 m3/s) ((30oC) - (10oC)) (1.0 kJ/kg oC) (1.204 kg/m3) / (2257 kJ/kg)

= 0.011 kg/s

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Temperature

oC
oF

Length

m
km
in
ft
yards
miles
naut miles

Area

m2
km2
in2
ft2
miles2
acres

Volume

m3
liters
in3
ft3
us gal

Weight

kgf
N
lbf

Velocity

m/s
km/h
ft/min
ft/s
mph
knots

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O

Flow

m3/s
m3/h
US gpm
cfm

3 30