Pipeng Toolbox : Steam Isentropic Calculators Login
Short Cuts
GO
Main ±
Beams ±
References ±
Fluid Flow ±
Fluid Properties ±
Maths ±
Materials ±
Pipelines ±
Soils ±
Subsea ±
Data ±
Units ±
Help ±
Demo

IAPWS R7-97 Steam Isentropic Constant Entropy

Calculate IAPWS R7-97 constant entropy isentropic steam temperature from initial entropy and final pressure.

For an isentropic process the entropy is constant. Initial entropy can be calculated from the steam table or user defined. The anomaly zone is set to region 2 (region 3 does not converge properly).

Note : For an isentropic process the stagnation enthalpy is constant (ho = h + 1/2 V^2). The stagnation enthalpy can be used to calculate the steam velocity.

Use the Result Plot option to plot final (isentropic) steam properties versus initial entropy.

Note : There is an anomaly in the steam calculation for region 3 between the saturated vapour line, the region 2/3 boundary, and the critical pressure. Refer to the region 3 anomaly help page for more details (click the utility button on the data bar). IAPWS R7-97 is intended for industrial use, and is a simplified version of IAPWS R6-95 for scientific use. IAPWS R7-97 was developed as an improvement of the IFC-67 model.

Reference : IAPWS R7-97 Industrial Formulation for thermodynamic Properties of Water and Steam

Change Module :

[FREE] tools are free in basic mode with no login (no plots, tables, goal seek etc). Login or Open a free account to use the tools in plus mode (with plots, tables, goal seek etc).
[PLUS] tools are free in basic CHECK mode with Login or Open a free account (CHECK values no plots, tables, goal seek etc). Buy a Subscription to use the tools in plus mode (with plots, tables, goal seek etc).
Try plus mode using the Plus Mode Demo tools with no login.   Help Using The Pipeng Toolbox (opens in the popup workbook)

Links : ±
CALCULATOR : IAPWS R7-97 Saturated Steam [FREE]   ±

Calculate steam saturation pressure and temperature (IAPWS R7-97 section 8).

The saturation point can be calculated from either the saturation temperature, or the saturation pressure. The calculation is valid between 273.15 K, and the critical point, 647.096 K. Use the Result Plot option to plot the steam temperature and pressure and steam properties versus either temperature or pressure.

Note : The speed of sound is not calculated for liquid vapour mixtures.

Tool Input

  • anomtype : Region 2/3 Anomaly Type
  • proptype : Steam Phase
    • Xu : User Defined Saturated Steam Quality
  • sattype : Saturation Pressure Type
    • Psu : User Defined Saturation Pressure
    • Tsu : User Defined Saturation Temperature

Tool Output

  • ρ : Density
  • Cp : Specific Heat Constant Pressure
  • Cp-Cv : Delta Specific Heat (Cp - Cv)
  • Cp/Cv : Specific Heat Ratio
  • Cv : Specific Heat Constant Volume
  • Ps : Saturation Pressure
  • Ts : Saturation Temperature
  • Vc : Speed Of Sound
  • Z : Compressibility Factor
  • cvg : Convergence Check
  • h : Enthalpy
  • s : Entropy
  • u : Internal Energy
  • vg : Mole Specific Volume
  • vm : Specific Volume
  • wv : Specific Weight
CALCULATOR : IAPWS R7-97 Steam Table [FREE]   ±

Calculate steam table from temperature and pressure (IAPWS R7-97 Steam Table).

Steam table values can be calculated for water and steam, saturated water, saturated steam, saturated water and steam, metastable water, and metastable steam. The calculations for water and steam are valid between 273.15 K and 1073.15 K (0 to 100 MPa), and between 1073.15 K and 2273.15 K (0 to 50 MPa).

The saturated water and steam calculations are valid between 273.15 K and 647.096 K.

The metastable calculation is valid between 273.15 K and 647.096 K, and for pressure from the saturated vapour line to the 5% equilibium moisture line (user defined). Use the Result Plot option to plot the steam properties versus temperature and pressure.

Tool Input

  • anomtype : Region 2/3 Anomaly Type
  • proptype : Steam Phase
    • Pu : User Defined Pressure
    • Tu : User Defined Temperature
    • Xu : User Defined Saturated Steam Quality

Tool Output

  • ρ : Density
  • Cp : Specific Heat Constant Pressure
  • Cp-Cv : Delta Specific Heat (Cp - Cv)
  • Cp/Cv : Specific Heat Ratio
  • Cv : Specific Heat Constant Volume
  • P : Pressure
  • T : Temperature
  • Vc : Speed Of Sound
  • Z : Compressibility Factor
  • cvg : Convergence Check
  • h : Enthalpy
  • s : Entropy
  • u : Internal Energy
  • vg : Mole Specific Volume
  • vm : Specific Volume
  • wv : Specific Weight
CALCULATOR : IAPWS R7-97 Steam Isentropic Constant Entropy [FREE]   ±

Calculate isentropic constant entropy steam properties from initial steam entropy and final pressure (IAPWS R7-97 steam table).

For an isentropic process, the initial steam entropy is equal to the final steam entropy. The initial steam entropy can either be calculated from the steam temperature and pressure, or user defined. The final temperature is calculated from the final pressure for constant entropy, or isentropic process. The anomaly zone is set to region 2 (region 3 does not converge properly). Use the Result Plot option to plot final (isentropic) properties and temperature versus initial entropy.

Tool Input

  • proptype : Initial Steam Phase
    • Piu : User Defined Initial Pressure
    • Tiu : User Defined Initial Temperature
    • Xiu : User Defined Initial Steam Quality (Saturated Liquid And Vapour)
    • siu : User Defined Initial Entropy
  • P : Final Pressure

Tool Output

  • ρ : Final Density
  • Cp : Final Specific Heat Constant Pressure
  • Cp-Cv : Final Delta Specific Heat (Cp - Cv)
  • Cp/Cv : Final Specific Heat Ratio
  • Cv : Final Specific Heat Constant Volume
  • T : Final Temperature
  • Vc : Final Speed Of Sound
  • X : Final Steam Quality (Saturated Liquid And Vapour Only)
  • Z : Final Compressibility Factor
  • cvg : Convergence Check
  • h : Final Enthalpy
  • s : Final Entropy
  • si : Initial Entropy
  • u : Final Internal Energy
  • vg : Final Mole Specific Volume
  • vm : Final Specific Volume
  • wv : Final Specific Weight
pipeng.com 2025 (2,040 μs : 7 ms : 1.250 MB) Pengu CMS ©