Entropy of Superheated Steam
A table with the entropy of steam superheated to temperatures above the boiling point with corresponding temperatures
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The table below can be used to find superheated steam entropy at different pressures and temperatures.
| Entropy of Superheated Steam (kJ/kgK) | |||||||||
| Absolute pressure | Saturation temperature (oC) |
Steam Temperature (oC) | |||||||
| (kN/m2) | (bar) | 120 | 150 | 180 | 200 | 230 | 250 | 280 | |
| 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, its temperature 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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