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Enthalpy Calculator
Calculate the total energy content of moist air — specific enthalpy, humidity ratio, specific volume, and vapor pressure. Enter dry-bulb temperature plus relative humidity, wet-bulb, or dew point.
Enter Your Values
Your Results
Enter dry-bulb temperature and one
humidity value to see all properties.
The Total Energy Your Air Carries
Enthalpy is the single number HVAC engineers use to size systems and compare humidification methods. It tells you how much heat the air holds — and how much your humidifier is adding to it.
Specific enthalpy is the total energy content of moist air per kilogram of dry air, combining the sensible heat of the air with the latent heat of its water vapor. Engineers use it to size air handlers, calculate cooling and heating loads, and — critically — to compare the energy cost of different humidification methods.
How much a humidifier changes enthalpy depends on the process. Steam adds moisture and heat, spiking enthalpy. Adiabatic humidification like Smart Fog's dry fog adds moisture while absorbing heat, so net enthalpy barely moves.
T = dry-bulb temp (°C)
W = humidity ratio (kg water / kg dry air)
1.006 = specific heat of dry air
2501 = latent heat of vaporization at 0°C
This calculator derives every psychrometric property from dry-bulb temperature plus your choice of relative humidity, wet-bulb temperature, or dew point — the three ways moisture is measured in the field — at standard sea-level pressure (101.325 kPa).
Humidify Without Inflating Your Energy Bill
Every humidifier changes your air's enthalpy — the question is how much. Steam injects high-energy vapor that your cooling system then has to remove. Smart Fog's adiabatic dry fog adds moisture by evaporation, absorbing heat instead of adding it, so net enthalpy barely moves.
Near-Zero Enthalpy Gain
Evaporation absorbs heat as it humidifies — your cooling system isn't fighting the humidifier.
Up to 60% Less Energy
No boiler, no steam generation — dramatically lower operating cost than isothermal systems.
Smaller HVAC Spec
Because the humidifier adds no heat load, you can specify smaller, cheaper cooling capacity.
Where Enthalpy Control Pays Off
Energy-intensive, humidity-critical environments where adiabatic humidification cuts load and cost.
Common Questions
Everything you need to know about moist air enthalpy and humidification energy.
Still have questions? Ask an expertCut Humidification Energy Costs
Get a custom enthalpy and energy analysis for your facility from a Smart Fog engineer — no obligation.