An assigned enthalpy and pressure problem is a combustion problem that requires an assigned enthalpy for the total reactant mixture, a set of assigned final pressures, and an estimated final temperature for the first pressure.   The enthalpy value is held constant resulting in an adiabatic flame temperature as well as other equilibrium mixture properties and composition.

The program will try to converge with only the possible gaseous products and then check on possible condensed products.   Sometimes the program cannot converge with gases alone because the temperature is driven to a very low value in an effort to obtain convergence.   This is usually remedied by adding one or two possible condensed products to the initial estimated composition by including an Insert dataset.   This inclusion of condensed species keeps the temperature in the range of the data.   The program can then find the correct condensed species and equilibrium composition.

Note that the Problem and Reactant datasets must be completed before using the Insert tab.

Refer to examples 3 and 5.

PRESSURE UNIT
The user has four choices for pressure units: bar (default); atm; psia; and mmHg.

PRESSURE VALUES
Up to 16 pressure values may be entered in the table.

Use the ENTER, RETURN, or TAB key or click on the next empty cell after each table entry.

OPTIONS
The default estimated temperature is 3800 Kelvin.   The user has the option of changing it.   Normally, the program will calculate the total reactant enthalpy from the reactant data but the user has an option to override this value.   This value is divided by universal gas constant R resulting in h/R units of (g-mol)K/(g of mixture).

HELP
The Help button displays the help menu for the Assigned Enthalpy and Pressure (hp) Problem.

SAVE
The Save button saves the data and returns to the Problem dataset.

RESET
The Reset button resets the data to the default settings.