Compressible Flow Gas Property

Calculate gas properties for common gases: argon Ar, n-decane C10H22, ethylene C2H4, ethyl chloride C2H5Cl, ethane C2H6, propene C3H6, propane C3H8, iso-butane C4H10, n-butane C4H10, iso-pentane C5H12, n-pentane C5H12, n-hexane C6H14, n-heptane C7H16, n-octane C8H18, n-nonane C9H20, methyl chloride CH3Cl, methane CH4, chlorine Cl2, carbon monoxide CO, carbon dioxide CO2, hydrogen H2, steam H2O, hydrogen sulphide H2S, hydrogen chloride HCl, helium He, krypton Kr, nitrogen N2, air N2+O2, ammonia NH3, oxygen O2, sulphur dioxide SO2, xenon Xe.

Properties include specific heat constant pressure, specific heat constant volume, specific heat ratio, molar mass, gas constant, gas specific gravity, critical point temperature, critical point pressure, and accentric factor.

Use the Result Table option to display a table of properties versus gas type.

Tool Input

• fluidtype : Fluid Type
  • Cpu : User Defined Specific Heat Constant Pressure
  • Cvu : User Defined Specific Heat Constant Volume
  • γu : User Defined Specific Heat Ratio
  • SGu : User Defined Specific Gravity
  • Pcu : User Defined Critical Point Pressure
  • Tcu : User Defined Critical Point Temperature
  • ωu : User Defined Accentric Factor

Tool Output

• γ : Specific Heat Ratio
• ω : Accentric Factor
• Cp : Fluid Heat Capacity Constant Pressure
• Cv : Fluid Heat Capacity Constant Volume
• Pc : Critical Point Pressure
• R : Gas Constant
• SG : Gas Specific Gravity Relative To Air
• Tc : Critical Point Temperature
• mm : Fluid Molar Mass

Calculate steam compressibility factor and density from steam temperature and pressure.

The gas compressibility factor is calculated from the critical point temperature, critical point temperature, and the accentric factor using either the Peng Robinson, Soave, Redlich Kwong or Van Der Waals equations of state (EOS). The compressibility factor calculation is valid for vapour phase only. Use the Result Plot option to plot compressibility factor versus pressure and temperature, compressibility factor versus pressure and equation of state type, or compressibility factor versus temperature and equation of state type.

Tool Input

• eostype : Equation Of State Type
  • Zu : User Defined Gas Compressibility Factor
• P : Fluid Pressure
• T : Fluid Temperature

Tool Output

• ρ : Fluid Density
• ω : Accentric Factor
• Pc : Critical Point Pressure
• Rg : Specific Gas Constant
• SG : Gas Specific Gravity
• Tc : Critical Point Temperature
• Vm : Molar Volume
• Z : Compressibility Factor
• cvg : Convergence Check
• mmg : Gas Molar Mass

Calculate steam table properties 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.

Note : There is an anomaly in the steam calculation for region 3 between the saturated vapour line, the regions 2/3 boundary, and the critical pressure. Select either region 2 or region 3 for calculations in the anomaly zone.

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

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