Enthalpy of Wet Steam

Sponsored Links

The actual enthalpy of evaporation of wet steam is the product of the dryness fraction - ζ - and the specific enthalpy - h_s - from the steam tables. Wet steam have lower usable heat energy than dry saturated steam.

h_t = h_s ζ + (1 - ζ) h_w         (1)

where

h_t = enthalpy of wet steam (kJ/kg, Btu/lb)

h_s = enthalpy of steam (kJ/kg, Btu/lb)

ζ = dryness fraction

h_w = enthalpy of saturated water or condensate (kJ/kg, Btu/lb)

The dryness fraction can be expressed as

ζ = w_s / (w_w + w_s)         (2)

where

ζ = dryness fraction

w_w = mass of water (kg, lb)

w_s = mass of steam (kg, lb)

Sponsored Links

Related Topics

• Thermodynamics - Thermodynamics of steam and condensate applications

Related Documents

• Mollier Diagram for Water-Steam - Enthalpy-entropy diagram for water and steam
• Properties of Saturated Steam - Pressure in Bar - The Saturated Steam Table with properties as boiling point, specific volume, density, specific enthalpy, specific heat and latent heat of vaporization
• Properties of Saturated Steam - SI Units - A Saturated Steam Table with steam properties as specific volume, density, specific enthalpy and specific entropy
• Specific Volume of Wet Steam - Wet steam an specific volume
• Steam and Vapor Enthalpy - Introduction and definition of vapor and steam enthalpy - specific enthalpy of saturated liquid, saturated vapor and superheated vapor
• Wet Steam Quality and the Dryness Fraction - An introduction and definition of vapor or steam quality and dryness fraction. Includes formulas for calculating wet steams enthalpy and specific volume