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Superheated Steam - Entropy

The entropy of steam superheated to temperatures above saturation points.

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

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Entropy of Superheated Steam (kJ/kgK)
Absolute Pressure		Saturation Temperature	Steam Temperature (^oC)
(kPa)	(bar)	(^oC)	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

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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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