Added: section 2.10: Does ChemApp require a hardware key, like FactSage and ChemSheet do? Added: section 6.4: ChemApp is fast, but I need it to be even faster, what can I do? Added section 5.6: I would like to use data from my FactSage databases with ChemApp. Does ChemApp require direct access to the FactSage databases, i.e. does […]
10.1 V 5.0, 14 April 2003 Read More »
This problem is very likely not related to ChemApp, but to an incorrect setup of support for precompiled header files in your project. One remedy is to open your “Project Settings” dialog, tab “C/C++”, category “Precompiled Headers”, and choose either “Not using precompiled headers” or “Automatic use of precompiled headers”. Both settings should work.
The undefined symbols reported by the linker usually start with one or two underscores, and reported to be first referenced in the ChemApp library. This happens during the linking of any ChemApp application program, even the demo programs (e.g.cademo1) included with the ChemApp distribution. Solution: The cause of this error is typically related to the
Both TQSTSC (Get – Stoichiometry – System – Component) and TQSTPC (Get – Stoichiometry – Phase – Constituent) return a molecular mass via the parameter WMASS. If you did not change the mass unit using TQCSU (Change – System – Unit), it remains set to the default unit, which is ‘mol’. The molecular mass is
8.1 Why do TQSTSC and TQSTPC always return a molar mass of 1.0? Read More »
If an error occurs (error no. 103 or 102) while reading the thermodynamic data-file using TQRFIL (Read – File), the reason is typically one of the following: The file has not been opened properly. This can especially happen when the subroutine TQOPEN (Open – File) is used (i.e. when programming in languages other than FORTRAN)
8.2 ChemApp does not read a data-file properly, how do I find out what is wrong? Read More »
If ChemApp indicates that it cannot calculate an equilibrium, typically returning error numbers 701 or 702 after a call to TQCE (Calculate – Equilibrium) or TQCEL (Calculate – Equilibrium – List – Results), check the conditions which are active for the equilibrium calculation in question using TQSHOW (Show – Present – Settings). Then check the
8.3 ChemApp says it cannot calculate an equilibrium, what is wrong? Read More »
Both TQGETR (Get – Results) and TQGDPC (Get – Thermodynamic – Data – Phase – Constituent) allow you to retrieve the values for these thermodynamic functions for phase constituents. The difference is that TQGETR retrieves these values for the previously calculated equilibrium state. The values retrieved with TQGDPC, on the other hand, have nothing to do
8.4 I want to retrieve Cp/H/S/G for a phase constituent, do I use TQGETR or TQGDPC? Read More »
The answer in short: Perform a target calculation with volume as target and pressure as target variable instead. When calculations are made under constant product volume by using the option ‘VT’ of the subroutines TQSETC (Set – Equilibrium – Condition) or TQSTEC (Set – Equilibrium – Condition – When – Stream – Input), ChemApp will
For users of ChemApp versions prior to 3.2.0: The values returned by TQSTXP (Get – Thermodynamic – Property – Of – A – Stream) always refer to the last calculated equilibrium state. If TQSTXP is called before the first equilibrium calculation has been performed using TQCE (Calculate – Equilibrium) or TQMAP (Calculate – One –
8.6 Why do the results I retrieve with TQSTXP look wrong or are all zero? Read More »
A set of subroutines to do exactly that will be included in the next release of ChemApp/ChemApp light (version 3.3.x).
8.7 How do I get information about the individual sublattices in a SUBL phase? Read More »
