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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:

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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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Related Topics

Steam and Condensate - Steam & condensate systems- properties, capacities, pipe sizing, systems configuration and more
Steam Thermodynamics - Thermodynamics of steam and condensate applications

Related Documents

2nd Law of Thermodynamics - Entropy and disorder
Compressible Gas Flow - Entropy - Calculating entropy in compressible gas flow
Enthalpy of Superheated Steam - Enthalpy of steam superheated to temperatures above boiling point
Properties of Saturated Steam - Pressure in Bar - Saturated Steam Table with properties like boiling point, specific volume, density, specific enthalpy, specific heat and latent heat of vaporization
Properties of Saturated Steam - SI Units - A Saturated Steam Table with steam properties as specific volume, density, specific enthalpy and specific entropy
Standardized Enthalpies and Entropies - Standardized enthalpies and entropies for some common substances
Steam and Vapor Enthalpy - Introduction and definition of vapor and steam enthalpy - specific enthalpy of saturated liquid, saturated vapor and superheated vapor
Steam Entropy - Basic steam thermodynamics and the entropy diagram
Steam Viscosity - Absolute viscosity of steam at pressure ranging 1 - 10000 psia
Vapor and Steam - Introduction to vapor and steam
Water vs Steam - Critical and Triple Point - Critical point is where vapor and liquid are indistinguishable and triple point is where ice, water and vapor coexist in thermodynamic equilibrium
Young's Modulus of Elasticity for Metals and Alloys - Elastic properties and Young's modulus for metals and alloys like cast iron, carbon steel and more

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