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)
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)
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
Thermodynamics of steam and condensate systems.
Basic air changing state processes - heating, cooling, mixing, humidifying and dehumidifying by adding steam or water - psychometric diagrams and the Mollier charts.
Air can be humidified by adding water or steam.
Estimate the amount of steam required (lb/h in 100 cfm) in humid air.
Using steam to humidify air.
Air in the steam will lower the surface temperatures in heat exchangers - and less heat will be transferred.
Air heating buildings - heat supply vs. air flow and temperature.
Heat transfer when steam condensates.
Latent and sensible cooling and heating equations - imperial units.
Latent and sensible cooling loads to consider when designing HVAC systems.
Calculating steam and condensate loads in steam heated systems.
Enthalpy change and temperature rise when heating humid air without adding moisture.
Saturated Steam Table with steam properties as specific volume, density, specific enthalpy and specific entropy.
Steam table with sensible, latent and total heat, and specific volume at different gauge pressures and temperatures.
Saturated Steam Table with properties like boiling point, specific volume, density, specific enthalpy, specific heat and latent heat of vaporization.
Steam consumption rates for typical steam heated consumers in industries like bakeries, breweries, paper factories etc.
Calculating the amount of steam in non-flow batch and continuous flow heating processes.
Steam systems carries heat through pipes from the boiler to consumers as heat exchangers, process equipment etc.
An introduction to the basic design of steam heating systems.