Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Wet steam, dryness fraction and enthalpy.
The actual enthalpy of evaporated wet steam is the product of the dryness fraction -
ζ - and the specific enthalpy - h - from the s steam tables. Wet steam has less usable heat energy than dry saturated steam.
h t = h s ζ + (1 - ζ) h w (1)
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)
ζ = dryness fraction
w w = mass of water (kg, lb)
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