# Heating Air with Steam

## Calculate air heating with steam

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

*m _{s} = q dt c_{p} ρ / h_{e} (1)*

*where *

*m _{s} = rate of condensation, steam consumption (kg/s)*

*q = volumetric air flow rate (m ^{3}/s)*

*dt = temperature difference in air flow ( ^{o}C)*

*c _{p} = specific heat of air (kJ/kg ^{o}C)*

*ρ* = density air (kg/m^{3})

*h _{e} = specific enthalpy of evaporating (condensation) steam (kJ/kg)*

### Example - Heating Air with Steam

*1 m ^{3}/s* of air is heated from

*10*to

^{o}C*30*with steam condensing at atmospheric pressure. The steam consumption can be calculated as

^{o}C*m _{s} = (1 m^{3}/s) ((30^{o}C) - (10^{o}C)) (1.0 kJ/kg ^{o}C) (1.204 kg/m^{3}) / (2257 kJ/kg)*

* = 0.011 kg/s*