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IAPWS R7-97 Steam Adiabatic Constant Enthalpy

Calculate IAPWS R7-97 constant enthalpy adiabatic steam temperature from initial enthalpy and final pressure.

For an adiabatic process the enthalpy is constant. Initial enthalpy 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 : The steam is assumed to be stationary at the initial and final conditions. For moving steam use the constant entropy calculator for constant stagnation enthalpy (ho = h + 1/2 V^2).

Use the Result Plot option to plot final (adiabatic) properties versus initial enthalpy.

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

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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 Adiabatic Constant Enthalpy [FREE]   ±

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

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

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)
    • hiu : User Defined Initial Enthalpy
  • 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
  • hi : Initial Enthalpy
  • s : Final Entropy
  • u : Final Internal Energy
  • vg : Final Mole Specific Volume
  • vm : Final Specific Volume
  • wv : Final Specific Weight
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