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IAPWS R7-97 Steam Quality

Calculate IAPWS R7-97 wet saturated steam quality from throttling calorimeter outlet temperature.

The steam expansion through the calorimeter is assumed to be adiabatic. The outlet pressure is normally atmospheric. The calculation is only valid for dry steam at the outlet of the calorimeter. Wet steam will give an incorrect result.

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 Saturated Steam Quality From Calorimeter Temperature [FREE]   ±

Calculate either saturated steam quality from calorimeter outlet temperature, or calorimeter outlet temperature from saturated steam quality. (IAPWS R7-97 Steam Table).

Steam quality is equal to the mass fraction of steam (the ratio of steam mass to total mass). Dry steam has a quality of 100%. Liquid has a quality of 0%. The saturation properties can be calculated from either the saturation temperature, or the saturation pressure. The calorimeter outlet is usually at atmospheric pressure (101.4 kPa). The calculation is most suitable for saturation pressure and temperature less than or equal to 3 MPA or 500 K, and steam quality greater than or equal to 93-95%. The calculation is less valid at higher saturation pressure and temperature. There is a very narrow range of calorimeter temperatures for saturation temperatures above 500 K.

The region 2 calculation is used in the anomaly zone. Use the Result Plot option to plot the saturation steam properties and temperature verus either saturation temperature, or saturation pressure.

Tool Input

  • sattype : Saturated Steam Pressure Type
    • Psu : User Defined Saturated Steam Pressure
    • Tsu : User Defined Saturated Steam Temperature
  • proptype : Steam Meaurement Type
    • Tou : User Defined Calorimeter Outlet Temperature
    • xu : User Defined Saturated Steam Quality
  • Po : Calorimeter Outlet Pressure

Tool Output

  • ρ : Saturated Steam Density
  • Cp : Saturated Steam Specific Heat Constant Pressure
  • Cp-Cv : Saturated Steam Delta Specific Heat (Cp - Cv)
  • Cp/Cv : Saturated Steam Specific Heat Ratio
  • Cv : Saturated Steam Specific Heat Constant Volume
  • Ps : Saturated Steam Pressure
  • To : Calorimeter Outlet Temperature
  • Ts : Saturated Steam Temperature
  • Z : Saturated Steam Compressibility Factor
  • cvg : Convergence Check
  • h : Saturated Steam Enthalpy
  • s : Saturated Steam Entropy
  • u : Saturated Steam Internal Energy
  • vg : Saturated Steam Mole Specific Volume
  • vm : Saturated Steam Specific Volume
  • wv : Saturated Steam Specific Weight
  • x : Saturated Steam Quality