I am afraid revenue generated from Alph has not proven to be sufficient to justify its continued sale. I greatly appreciate the support of the folks who have purchased Alph in the past and hope that it will continue to serve you well in the future.
This and related pages will be maintained for archival purposes only.
Alph - A Little Process Helper
The base version of Alph can be purchased for $19.99 (or currency equivalent) in the Apple App Store. It contains all the features listed below and has VMG'sAdvanced Peng-Robinson for Natural Gas property package and a selection of basic compounds used in natural gas processing:
C1-C10, iC4, iC5, H2O, CO2, H2S and N2
Additional compounds and property package options can be added by means of purchases made right in the program in the Alph Store.
Most of these options are quite inexpensive, but the Alph Professional option, which includes over 5600 compounds and the NRTL property package, is $499.99. This may seem expensive for an IOS device, but it is a fraction of the price of anything remotely comparable on a PC.
There is also a separate free version called Alph Jr available in the Apple App Store. This has all the features of Alph, but is limited to just 10 compounds, C1-C10, and does not have the in application store for purchasing additional options. This is intended both as a free introduction to Alph's features and for instructional and learning purposes.
Calculate Fluid Properties
Alph can perform two and three phase flashes for either normal or retrograde conditions. The types of flashes available are:
Temperature - Pressure
Temperature - Enthalpy
Temperature - Vapour fraction
Pressure - Enthalpy
Pressure - Entropy
Pressure - Vapour fraction
Bubble Point Temperature
Bubble Point Pressure
Dew Point Temperature
Dew Point Pressure
Two phase envelopes can be calculated with optional quality lines. The graph can be zoomed in and out by pinching and dragged around to display the temperature and pressure under the cross hairs.
Hydrate formation temperature or pressure can be calculated with the this tool. If water is not present in the fluid (note water is not available in the base version or Alph Jr), then free water will be assumed. If water is present, its quantity will be taken into account as will the presence of alcohol or glycol inhibitors.
Solves single or multiple formulas, including array formulas, which represent f(x)=0 are solved with x being the output values of the tool. This allows both simple single value adjustments as well as complex multiple recycle problems to be addressed.
Alph has a simple formula system, which allows fluids to be defined in terms of one another, allowing for surprisingly sophisticated calculations. The fluid in the screen shot is being defined with its pressure being equal to the feed fluid minus two times a pressure drop variable (Alph has three main types of objects: fluids, variables and tools). The flow and composition are being set equal to the feed fluid vapour phase.
You can save and load cases from the paste board, which allows you to mail cases to other Alph users. You can also save and mail yourself spreadsheet reports and phase envelope results. Alph also supports transferring cases to your PC using iTunes File Sharing.
Case files are in human readable JSON, while reports are either tab or comma separated (CSV).
Alph can calculate the following fluid properties:
Molar vapour fraction (phase fraction when viewing phases)
Molar flow rate
Specific molar enthalpy
Specific molar entropy
Specific molar volume
Standard liquid density
Constant pressure specific molar heat capacity
Constant volume specific molar heat capacity
Gibbs free energy
Lower heating value
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