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Entropy of Superheated Steam

Entropy of steam superheated to temperatures above saturation point

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

Entropy of Superheated Steam (kJ/kgK)
Absolute PressureSaturation TemperatureSteam Temperature (oC)
(kN/m2)(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
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