The Room element allows you to define a specific area inside the building (room, corridor, vestibule, etc.).
The volume of the room is the space limited by the room’s perimeter and a height equal to the floor height on which the room is located. This means that if an area inside the building is not marked as a room, its initial temperature is equal to the ambient temperature (the value specified in the Temperature field of the Fire Simulation Parameters). By default, the temperature in rooms is equal to the ambient temperature.
If the “Account for Temperature” option is enabled in the room properties, this value is used when simulating the fire development dynamics instead of the default initial temperature value for all rooms.
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In the FDS file, a code similar to the following will appear:
&INIT XB=-4,1,-1,3,0,3 TEMPERATURE=30/
Here, the INIT parameter group sets the initial temperature specified by the TEMPERATURE parameter in the area of space limited by the coordinates specified by the XB parameter.
If the room has a non-rectangular shape and/or is not oriented along the X and Y axes, it is represented by several INIT groups in the FDS file.
Note that this only concerns the initial air temperature in the specified volume. It can change later according to the processes in the scenario.