Steam and Vapor Enthalpy Calculator

Calculate enthalpy properties of steam and vapor including saturated water, saturated steam, superheated steam, and evaporation energy.

Steam and Vapor Enthalpy Calculator

Calculate various enthalpy properties for steam and water vapor systems.

Key Concepts

  • Sensible Heat: Heat required to change temperature
  • Latent Heat: Heat required for state change (evaporation)
  • Enthalpy (H): H = m × h (mass × specific enthalpy)
  • Specific Enthalpy (h): h = u + pv (internal energy + pressure × volume)
Calculator

Inputs

Results

Specific Enthalpy of Saturated Water (hf)-- kJ/kg
Specific Enthalpy of Evaporation (he)-- kJ/kg
Energy to Evaporate Water (Q)-- kJ
Specific Enthalpy of Superheated Steam (hs)-- kJ/kg
Total Enthalpy (H = m × h)-- kJ

Formulas Used

Specific Enthalpy of Saturated Water (hf):

  • hf = cw × (tf - t₀)

Specific Enthalpy of Evaporation (he):

  • he = hg - hf

Energy to Evaporate Water (Q):

  • Q = he × m

Specific Enthalpy of Superheated Steam (hs):

  • hs = hg + cps × (ts - tf)

Total Enthalpy (H):

  • H = m × h

Where:

  • hf = specific enthalpy of saturated water (kJ/kg)
  • hg = specific enthalpy of saturated steam (kJ/kg)
  • he = specific enthalpy of evaporation (kJ/kg)
  • hs = specific enthalpy of superheated steam (kJ/kg)
  • cw = specific heat of water = 4.19 kJ/kg·°C
  • cps = specific heat of steam at constant pressure = 1.86 kJ/kg·°C
  • m = mass (kg)
  • tf = saturation temperature (°C)
  • ts = superheated steam temperature (°C)
  • t₀ = reference temperature (°C)