Basic Mechanical Engineering (3110006)

BE | Semester-1   Summer-2020 | 11-06-2020

Q3) (b)

Write the uses of Steam Tables.

  • A saturated steam table is an indispensable tool for any engineer working with steam.
  • It is quite cumbersome to calculate each time, the value and relation between various properties.
  • So, these are experimentally determined and presented in the form of tables showing value of each property w.r.t either saturation temperature or saturation pressure.
  • It is typically used to determine saturated steam temperature from steam pressure, or the pressure from saturated steam temperature.
  • In addition to pressure and temperature, these tables include other related values such as specific enthalpy (h) and specific volume (v), and specific entropy (s).
  • All the properties are vary with the change in saturation pressure and for a particular saturation pressure there is a fix value of saturation temperature.
  • These properties are required in thermo dynamic calculations where steam is used as working medium.
  • The value of properties of saturated steam and superheated steam are given separately.
  • If any given pressure falls in between two values given in table then value of concerned property on this pressure may be calculated by interpolation.
  • The column in the steam table showing properties of saturated stream are as given below:


Absolute Pressure in bar (  P  Saturated Temperature in °C  t  Specific Volume in m3/kg Specific Enthalpy in kJ/kg Specific Entropy in kJ/Kg K
Water vf Steam vg Water hf Evaporation hfg Steam hg Water sf Evaporation sfg Steam sg