button
of the Components
toolbar (or use the corresponding Insert
menu item). Next, in the Object Properties Window for the added component,
you will need to select a substance and set its percentage content.GERG-2008
This library is intended for a precise calculation of properties and phase equilibria of natural gas of various compositions using the GERG-2008 method. The advantage of this library compared to the "Properties" and "STARS" libraries (which can also be used to model natural gas) is the higher accuracy of gas calculations at high pressures (over 7-8 MPa).
When using the "GERG-2008" library, it is necessary to enter the molar or mass composition of natural gas (which is indicated using the corresponding switch in the Object Parameters Window for the product); the composition is specified component by component.
To add a fluid component, select
the fluid (or any already existing component of this fluid) in the project
tree and click the button
of the Components
toolbar (or use the corresponding Insert
menu item). Next, in the Object Properties Window for the added component,
you will need to select a substance and set its percentage content.
Substances are selected from a drop-down list, they can be "searched by first letters" - to do this, place the cursor in the drop-down list and start entering its name. As you type, the list will scroll to the first component that matches the name. After selecting a component, its code will be displayed in the corresponding field, which, if necessary, allows you then to switch the method for calculating fluid properties to some other library without re-entering the components (of course, only if this library contains all the components entered).
Then, in the corresponding field, you must enter the percentage content of the selected component in the mixture. Please note that the calculation of the properties of oil fractions and fuel oils using the "GERG-2008" library is not performed. The full list of available substances in this library can be found here.
Checking the phase state at calculations using the "GERG-2008" library is optional; you can enable/disable it by going to the "GERG-2008" tab of the Object Parameters window for the product:
Information on methods of calculating natural gas according to the library "GERG-2008" can be found here.