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Superheated Steam - Entropy

The entropy of steam superheated to temperatures above saturation points.

The entropy of superheated steam at different pressures and temperatures are indicated below:

For full table  - rotate the screen!

Superheated Steam - Entropy vs. Pressure
Absolute PressureSaturation TemperatureEntropy (kJ/kgK)
Steam Temperature (oC)
(kPa)(bar)
(oC)
120150180200230250280
150 1.5 111.4 7.239 7.419 7.557 7.644 7.767 7.845 7.957
200 2 120.2 7.279 7.420 7.507 7.631 7.710 7.822
250 2.5 127.4 7.169 7.311 7.400 7.525 7.604 7.717
350 3.5 138.9 6.998 7.146 7.237 7.364 7.444 7.558
400 4 143.6 6.929 7.079 7.171 7.299 7.380 7.495
500 5 151.8 6.965 7.059 7.190 7.272 7.388
600 6 158.8 6.869 6.966 7.100 7.183 7.300
700 7 165.0 6.786 6.886 7.022 7.107 7.225
800 8 170.4 6.712 6.815 6.954 7.040 7.156
900 9 175.4 6.645 6.751 6.893 6.980 7.101
1000 10 179.9 6.584 6.692 6.838 6.926 7.049
1100 11 184.4 6.638 6.787 6.876 7.001
1200 12 188.0 6.587 6.739 6.831 6.956
1400 14 195.0 6.494 6.653 6.748 6.877
1600 16 201.4 6.577 6.674 6.806
2000 20 212.4 6.440 6.546 6.685
2500 25 223.9 6.292 6.407 6.558
3500 35 242.5 6.173 6.349

If saturated steam is exposed to a surface with a higher temperature the temperature of the steam will increase above the evaporating temperature. The steam is then described as superheated by the temperature degrees above saturation temperature.

  • Note! Steam cannot be superheated whilst it is still in the contact with water, because additional heat will evaporate more water, cooling down the superheated steam.

Superheated steam is produced by passing saturated steam through an additional heat exchanger.

Superheated steam is also called

  • surcharged steam
  • anhydrous steam
  • steam gas

Related Topics

  • Steam and Condensate

    Design of steam & condensate systems with properties, capacities, sizing of pipe lines, system configuration and more.

  • Thermodynamics

    Calculate heat, work, temperature and energy. The thermodynamics of steam and condensate systems. Water and Ice properties.

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