Steam Plot
for iPad 
Steam Plot for iPad
App Store - Steam Plot

REQUIREMENTS

  • Requires iOS 12.1 or later. Compatible with iPad.

FEATURES

  • Implements the mathematical formulation from the IAPWS-IF97 to calculate the properties of steam.
  • Calculates 20 thermodynamic and transport properties of steam and 10 partial derivatives.
  • Generates 4 Diagram Plot types with isolines calculated all over the IAPWS-IF97 range.
  • Calculations are all over the range of the IAPWS-IF97, or just the two-phase region including liquid and vapor saturation states. Calculations can be saved to a database.
  • It allows for 14 combinations of thermodynamic properties to be entered.
  • Validates each calculation informing the user of the range of values to be entered in case of an invalid input.
  • It manages and converts results and inputs between the SI (metric) and I-P (English) System of Units.
  • Results can be sent by email along with a comma-separated value (CSV) file. Diagram Plots can be saved a projects and send as high-resolution pdf files.

DOWNLOADS

Steam Plot performs calculations and generates diagram plots of thermodynamic and transport properties of steam based on the latest IAPWS-IF97 Formulation and IAPWS releases.

Given a combination of two thermodynamic properties out of 14 different possible combinations, it calculates 20 thermodynamic and transport properties of steam and 10 partial derivatives.

Calculates and plots isolines of pressure, temperature, specific enthalpy, specific entropy, specific volume and vapor fraction for 4 different plot diagrams.

The numerical results and plots obtained are suitable for engineering, scientific, industrial or academic use.

MAIN FEATURES

  • Performs all the calculations implementing the latest mathematical formulations from the IAPWS (International Association for the Properties of Water and Steam) Industrial formulation (Revision 2007):
    • Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam.
    • Properties of steam, water and ice from the Industrial Formulation IAPWS-IF97, the Scientific Formulation IAPWS-95, IAPWS Formulation 2008 and IAPWS Formulation 2006. Properties of dry air are from the NIST Reference equation of Lemmon et al.

  • Calculations operate in two modes:
    • General Properties: Input and Output values are all over the range of the IAPWS-IF97 Formulation.
    • Saturation Properties: Input and Output values are on the range of the two-phase region (region 4) of the IAPWS-IF97 Formulation, including saturation values of liquid and vapor.

  • Allows for 14 different combinations of thermodynamic properties to be entered as input parameters:
    • Temperature / Pressure
    • Temperature / Specific Enthalpy
    • Temperature / Specific Internal Energy
    • Temperature / Specific Entropy
    • Temperature / Specific Volume
    • Temperature / Vapor Fraction
    • Pressure / Specific Enthalpy
    • Pressure / Specific Internal Energy
    • Pressure / Specific Entropy
    • Pressure / Specific Volume
    • Pressure / Vapor Fraction
    • Specific Enthalpy / Specific Entropy
    • Specific Enthalpy / Specific Volume
    • Specific Internal Energy / Specific Volume

  • Supports input parameters and calculation results in both the SI (metric) and the I-P (English) system of units.

  • For each combination of input thermodynamic properties, it calculates and provides the user with information about the appropriate input values in the valid range of computations.

  • Results can be sent by email in an HTML file along with a comma-separated value (CSV) file.

  • Generates 4 Diagram Plot types with isolines calculated all over the IAPWS-IF97 range in both the SI (metric) and I-P (English) system of units:

    • Temperature - Specific Entropy
      • Pressure
      • Specific Enthalpy
      • Specific Volume
      • Vapor Fraction
    • Specific Enthalpy - Specific Entropy
      • Pressure
      • Temperature
      • Specific Volume
      • Vapor Fraction
    • log Pressure - Specific Enthalpy
      • Temperature
      • Specific Entropy
      • Specific Volume
      • Vapor Fraction
    • Pressure - Temperature
      • Specific Enthalpy
      • Specific Entropy
      • Specific Volume

  • Steam points calculated can be stored in a database for later retrieval. Plot diagrams can be zoomed or displaced on a particular region of interest and saved as individual projects por each type of diagram and units.

  • Plot diagrams can be sent by email as high-resolution PDF files.

SYSTEM OF UNITS

Thermodynamic variables in the SI (metric) system of units can be entered and/or the calculation results can be displayed in the following units:

  • Pressure: Pa, kPa, bar, mmHg
  • Temperature: °C, K
  • Specific Enthalpy: kJ/kg, J/kg, kcal/kg
  • Specific Entropy: kJ/(kg·K), J/(kg·K), kcal/(kg·K)
  • Specific Internal Energy: kJ/kg, J/kg, kcal/kg
  • Specific Volume: m³/kg, cm³/g, l/kg
  • Density: kg/m³, g/cm³, kg/l
  • Speed of Sound: m/s, km/h
  • Dynamic Viscosity: Pa·s, kg/(m·s), P
  • Kinematic Viscosity: m²/s, St
  • Thermal Conductivity: W/(m·K), kcal/(m·s·K)
  • Thermal Diffusivity: m²/s, m²/h

Thermodynamic variables in the I-P (English) system of units can be entered and/or the calculation results can be displayed in the following units:

  • Pressure: psi, inHg, inH2O, atm
  • Temperature: °F, °R
  • Specific Enthalpy: Btu/lbm, ft lbf/lbm
  • Specific Entropy: Btu/(lbm·°R), ft lbf/(lbm·°R)
  • Specific Internal Energy: Btu/lbm, ft lbf/lbm
  • Specific Volume: ft³/lbm, in³/lbm, gal(US)/lbm
  • Density: lbm/ft³, lbm/in³, lbm/gal(US)
  • Speed of Sound: ft/s, mile/h
  • Dynamic Viscosity: lbm/(ft·s), lbf·s/ft²
  • Kinematic Viscosity: ft²/s, ft²/h
  • Thermal Conductivity: Btu/(ft·h·°R), W/(in·°F)
  • Thermal Diffusivity: ft²/s, ft²/h

Output variables

  • Vapor Fraction
  • Temperature
  • Pressure
  • Specific Volume
  • Density
  • Specific Enthalpy
  • Specific Entropy
  • Specific Internal Energy
  • Isobaric Heat Capacity
  • Isobaric Cubic Expansion Coefficient
  • Isentropic Exponent
  • Isothermal Compressibility
  • Thermal Conductivity
  • Thermal Diffusivity
  • Dynamic Viscosity
  • Kinematic Viscosity
  • Prandtl Number
  • IAPWS-IF97 Region

Partial derivatives:

  • Derivate of volume on pressure with constant temperature - (dvdP)T
  • Derivate of internal energy on pressure with constant temperature - (dudP)T
  • Derivate of entropy on pressure with constant temperature - (dsdP)T
  • Derivate of enthalpy on pressure with constant temperature - (dhdP)T
  • Derivate of volume on temperature with constant pressure - (dvdT)P
  • Derivate of internal energy on temperature with constant pressure - (dudT)P
  • Derivate of entropy on temperature with constant pressure - (dsdT)P
  • Derivate of enthalpy on temperature with constant pressure - (dhdT)P
  • Derivate of pressure on temperature with constant specific volume - (dPdT)v
  • Derivate of pressure on specific volume with constant temperature - (dPdv)T

Steam points in the Two-phase Properties tab outputs all the properties shown above for results in region 4 of the IAPWS-IF97 Formulation (excluding partial derivatives), and the same properties for the Saturated Liquid State and Saturated Vapor States.


Range of Input/Output Variables (SI)

Property

Valid range

Units

Temperature

0 ≤ T ≤ 2000

°C

Pressure

610 ≤ P ≤ 100.0E6

Pa

Specific Enthalpy

-41.5878 ≤ h ≤ 2810.0E3

J/kg

Specific Internal Energy

-282.7252 ≤ u ≤ 6327.862E3

J/kg

Specific Entropy

-8.5823 ≤ s ≤ 13905.8727

J/(kg·K)

Specific Volume

1.00007E-4 ≤ v ≤ 1719.8658

m³/kg

Vapor Fraction

0 ≤ x ≤ 1.0

kg/kg


Range of Input/Output Variables (I-P)

Property

Valid range

Units

Temperature

32.0 ≤ T ≤ 3632.0

°F

Pressure

0.088473 ≤ P ≤ 1450.4

psi

Specific Enthalpy

-0.0178795 ≤ h ≤ 3171.5306

Btu/lbm

Specific Internal Energy

-0.12155 ≤ u ≤ 2720.491

Btu/lbm

Specific Entropy

-0.0020498 ≤ h ≤ 3.32136

Btu/(lbm·°R)

Specific Volume

1.601958E-2 ≤ v ≤ 27549.6

ft³/lbm

Vapor Fraction

0 ≤ x ≤ 1.0

lb/lb


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Steam Plot - Calculator Mode (4:11)

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Steam Plot - Diagram Plot Mode (7:26)


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