Use registering devices to monitor changes in fire hazards in the Fenix+ 3 application. You can place the registering devices anywhere, primarily along the proposed escape routes.
There are several ways to place registering device:
- Freestanding registering device
- Registering device in the Door (mark the door as “With registering device”).
- Registering device on Stairs or a Ramp (mark the stairs or ramp as “With registering device”).
Freestanding registering device
By default, freestanding registering devices are positioned at a height of 1.7 m from the floor level. The user can set any desired level.
Fire hazard control is conducted at one or several control points, evenly spaced along the registering device. The distance between the control points must not exceed 1 m.
If the registering device is shorter than 1.5 m, fire hazard measurements are taken at a single control point in the middle of the registering device.
The following physical values are measured at each control point:
- Temperature
- Visibility range
- Oxygen concentration
- Carbon dioxide concentration
- Carbon monoxide concentration
- Hydrogen chloride concentration
- Thermal radiation flux
The radiation flux at each control point is measured in two directions perpendicular to the registering device axis and lying in the horizontal plane.
To measure each hazardous fire factor at each control point, sensors are created in the FDS model using the DEVC parameter group. For each control point, lines in the model appear as follows:
&DEVC ID='1' QUANTITY='TEMPERATURE' XYZ=1, 0.5, 1.7/
&DEVC ID='2' QUANTITY='VISIBILITY' XYZ=1, 0.5, 1.7/
&DEVC ID='3' QUANTITY='DENSITY' SPEC_ID='OXYGEN' XYZ=1, 0.5, 1.7/
&DEVC ID='4' QUANTITY='DENSITY' SPEC_ID='CARBON DIOXIDE' XYZ=1, 0.5, 1.7/
&DEVC ID='5' QUANTITY='DENSITY' SPEC_ID='CARBON MONOXIDE' XYZ=1, 0.5, 1.7/
&DEVC ID='6' QUANTITY='DENSITY' SPEC_ID='HYDROGEN CHLORIDE' XYZ=1, 0.5, 1.7/
&DEVC ID='7' QUANTITY='RADIATIVE HEAT FLUX GAS' XYZ=1, 0.5, 1.7 ORIENTATION=1,0,0/
&DEVC ID='8' QUANTITY='RADIATIVE HEAT FLUX GAS' XYZ=1, 0.5, 1.7 ORIENTATION= −1,0,0/
The sensor coordinates (XYZ=…) are transferred to the FDS model as is, without approximating or aligning them to the cell size. Unlike walls, coordinates of which are aligned.
The ‘RADIATIVE HEAT FLUX GAS’ sensor includes a direction parameter (ORIENTATION), which means it measures heat flux from a specific direction. Registering devices are typically placed on proposed escape routes. Because of that the default perpendicular directions of the heat flux sensors allow for monitoring thermal radiation crossing the escape route from both sides. If you need to measure radiation flux from a specific direction at a particular point, place a separate registering device perpendicular to the desired direction at that point.
Registering device in the door
The registering device in the door is always located at a height of 1.7 m from the lower level of the door where it is placed.
Door openings are particularly important points of escape routes, which is why in Fenix+ 3 every door can be equipped with registering device. Registering devices are automatically placed on both sides of the door, allowing for hazardous fire factor assessment from both sides, regardless of which side the fire occurres.
When placing a door with registering devices, registering devices with a length equal to the width of the door opening are placed on both sides of the door. To avoid cluttering the scene, these registering devices are not displayed, but in reality, sensors are present and are positioned at a distance equal to half the size of the cell in the calculation area where the door is located (see the blue arrows in the picture). The number of control points depends on the length of the registering device (door width) in the same way as for a simple registering device.
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Registering device on Stairs or Ramp
When the “With registering device” property is enabled, a registering device is placed at a height of 1.7 m at the beginning and end of the stair flight.
