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Thermos Index

Thermodynamics - Steam tables Index.


The pages linked provide steam table data including temperature-pressure referenced specific volume, internal energy, enthalpy and entropy values.  The information is listed in SI units

A typical plot which can be produced using the tables is shown below for the T vs h.  Similar plots could be produced for v. s. and u.  The critical point C at which the there is no difference between the liquid and gaseous phase is at 221.2 bar and 374.15 oC.

The Triple point at which solid ,liquid and gas phases can all exist together is at 0.0061 bar and 0.01 oC.   This triple point is used as the zero datum for specific enthalpy, entropy, and internal energy.

Saturated Steam-Pressure Saturated Steam-Temperature Superheated steam ( 150oC-160oC-180oC )
Superheated steam (200oC-220oC-250oC ) Superheated steam (300oC-350oC-400oC ) Superheated steam ( 450oC-550oC-650oC )

Note: As stated above 0.1o C is the datum (zero) point for enthalpy, entropy, and internal energy values

  • P = Absolute pressur (bar) - conditions in steam tables are directly related to the pressure
  • t s = Saturation temperature (boiling point) in deg Celsius at pressure P
  • v f = Specific volume of saturated liquid (No gas content but at the temperature of evaporation)..m3/kg
  • v g = Specific Volume of dry saturated gas (No liquid content-but no superheat)..m3
  • u f = Specific Internal Energy of saturated liquid ....(units kJ/kg)
  • u fg = Specific Internal Energy of change of phase form liquid to gas at stated condions ..kJ/kg
  • u g = Specific Internal Energy of dry saturated gas (No liquid content-but no superheat)..kJ/kg
  • h f = Specific Internal Energy of saturated liquid ..kJ/kg
  • h fg = Specific Latent heat or Enthalpy of change of phase..kJ/kg
  • hg = Specific Enthalpy of dry saturated gas (No liquid content-but no superheat) ..kJ/kg
  • s f = Specific Entropy of saturated liquid ..kJ/kg.K
  • s fg = Specific Entropy of change of phase form liquid to gas at stated condions ..kJ/kg.K
  • s g = Specific Entropy of dry saturated gas (No liquid content-but no superheat)..kJ/kg.K

When using steam tables it is often necessary to determine to property of a steam/water mixture.  In this case the quality (x) of the steam is used. This is defined as the mass of steam per unit mass of the mixture.  The following relationships apply.

Thermodynamic /Heat Transfer Links Steam Table Links
  1. Thermodynamic Properties of Water (steam Tables)..Very useful and convenient calculator
  2. Efunda Steam Properties..Useful calculator .. Limited access before membership required
  3. NIST/ASME Steam Properities Database..Steam data software download -($50) Based on International Association for the Properties of Water and Steam (IAPWS)
  4. WASP water and steam properties..Steam and Water properties calculator - very conveniet

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Thermos Index

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Last Updated 27/01/2013