Elevation in VentSim (density)

[Customer]

Hi, 

The elevation in my model does not represent the real elevation. How can VentSim calculate the correct densities?

 

[Florian Michelin]

Hi,

There is 2 elevations not to confuse:

• The one used in the model. If the model has been started with a DXF, the elevation will be correctly set according to the DXF. This is not necessarily (very rarely) the real elevation.
• The real elevation, cannot be seen easily in VentSim however needs to be set properly to calculate the densities and heat through the model.

 To set the elevation go to settings>settings>simulation>environvement. There is 2 values to set (see screenshot), which represent the elevation of a reference point on the surface (the portal for exemple).

• Surface Datum Elevation Above Sea Level: the altitude of the point above sea level (red).
• Surface Datum of Mine Grid: the elevation of the same point in VentSim (green).

An alternative to setting the elevation is to set the atmospheric pressure at that point or the density at that point. Elevation, pressure and density are all calculated from each other.

Those values are important to calculate the densities and rock temperatures in the mine.