|
|
|
The design of CFAST
uses a series of differential equations to move gases and physical properties
such as temperature, pressure, etc through the portals into adjoining
volumes.
|
|
|
|
The simulator uses
the following parameters for its physical properties:
|
|
•Gas concentration for each type of gas such as oxygen,
carbon dioxide, carbon monoxide
|
|
•Raw fuel density which can burn
|
|
•Combustion byproducts
|
|
•Atmospheric pressure and temperature
|
|
•Wall, ceiling, and floor temperatures
|
|
|
|
Volumes are
represented by floor to ceiling height and the distance between the
walls. A precise position in space is
irrelevant for the calculations. This
is different than the Architectural model which assumes an X-Y-Z coordinate
for each room.
|
|
|
|
Similarly, the shape
of the vent is entered, but the only other relevant factor that influences
the flow of the gases and fire is whether the position of the vent is
horizontal or vertical.
|
