Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Wet Steam - Enthalpy

Wet steam, dryness fraction and enthalpy.

Sponsored Links

The actual enthalpy of evaporated wet steam is the product of the dryness fraction - ζ - and the specific enthalpy - hs - from the steam tables. Wet steam has less usable heat energy than dry saturated steam.

ht = hs ζ + (1 - ζ) hw                    (1)


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

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

ζ = dryness fraction

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

The dryness fraction can be expressed as

ζ = ws / (ww + ws)                      (2)


ζ = dryness fraction

ww = mass of water (kg, lb)

ws = mass of steam (kg, lb)

Sponsored Links

Related Topics

Related Documents

Sponsored Links


Search is the most efficient way to navigate the Engineering ToolBox.

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about


This page can be cited as

  • The Engineering ToolBox (2008). Wet Steam - Enthalpy. [online] Available at: [Accessed Day Month Year].

Modify the access date according your visit.

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Unit Converter


Sponsored Links