Free iPhone Apps

Alph is a process calculator for the iPhone and iPod Touch based on the world class thermodynamic and physical properties calculations of VMGThermo, which is the Virtual Materials Group package that powers their comprehensive process simulator VMGSim.

Two and three phase flash calculations are supported, along with two phase envelopes and hydrate temperature and pressure prediction, with or without inhibitors. Alph also has a simple formula system, which allows fluids to be defined in terms of one another, allowing for surprisingly sophisticated calculations. See the web page tutorial where a dew point control gas plant, including refrigeration and stabilizer is calculated.

Alph comes standard with VMG's Advanced Peng-Robinson for Natural Gas package and ten light hydrocarbons (C1-C10). A package of additional compounds important to gas processing can be purchased in an a store right in Alph.

These compounds are: iC4, nC4, CO2, H2S, N2, O2, H2O, H2, He-4, methanol, ethanol, ethylene glycol, diethylene glycol, triethylene glycol, methyl mercaptan, ethyl mercaptan, carbonyl sulfide, carbon disulfide, dimethyl sulfide and dimethyl disulfide.

An option to add custom hydrocarbon compounds, such as heavier fractions can also be purchased in the application, as can a rigorous distillation tower tool and a steam table property package. See the Alph web site for details.

An instructional version called Alph Jr. is also available. It has all the capabilities of Alph and even includes the distillation tower as a standard feature, but does not have the store and cannot be extended with additional compounds or property packages. This is suitable for becoming familiar with Alph's capabilities and for instructional and learning purposes.

Properties Alph can Calculate

• Molar vapour fraction (phase fraction when viewing phases)
• Temperature
• Pressure
• Molar flow rate
• Specific molar enthalpy
• Specific molar entropy
• Energy flow
• Molecular weight
• Compressibility factor
• Specific molar volume
• Mass density
• Standard liquid density
• Viscosity
• Kinematic viscosity
• Thermal conductivity
• Surface tension
• Constant pressure specific molar heat capacity
• Constant volume specific molar heat capacity
• Exergy
• Gibbs free energy
• Lower heating value
• Higher heating value
• Mass flowrate
• Specific mass enthalpy
• Specific mass entropy
• Constant pressure specific mass heat capacity
• Constant volume specific mass heat capacity
• Correction to enthalpy to calculate heats of reaction
• Composition in mole fractions
• Composition in mass fractions
• Compound molecular weight

? 2009 RedTree Development Inc.