Steam Heating Air
Calculate steam heated air systems.
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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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