The Pathfinder calculation of Fractional Effective Dose (FED) uses the equations described in the SFPE Handbook of Fire Protection Engineering, 5th Edition, Vol 3, Chapter 63, pages 2308-2428 ( SFPE 2016), shown below in Fractional Effective Dose Equations. Background for Calculation of Fractional Effective Dose To calculate FED during evacuation, the required data must be saved during the PyroSim simulation and this data must be accessed as part of the Pathfinder simulation. Using Fire Results to Calculate FED During Evacuation
You can offset the PyroSim results display time in the FDS Preferences dialog on the Analysis menu. If the user only wants to display the PyroSim and Pathfinder results simultaneously, run the Results Viewer and open both the Pathfinder results (*.PFR file) and the PyroSim results (*.SMV file). Simultaneous Display of Evacuation (Pathfinder) and Fire (PyroSim) Results Fractional Effective Dose (FED) calculation for occupant that delayed 90 seconds before evacuation 2. The Fractional Effective Dose (FED) for one of the occupants that delayed 90 seconds before evacuation is shown below in Figure 1. Two occupants wait 90 seconds before evacuating. They first meet in the conference room and then exit the building.įED is calculated for selected occupants as they evacuate. The video below displays fire, smoke, and the evacuating occupants. See the post Manually Coupling FDS and Pathfinder to Respond to Smoke for instructions on how to link fire simulation output with evacuation simulation movement. In this post, we demonstrate the capability currently available in Pathfinder 2018.1 and PyroSim 2017.2. We have also completed limited capability to calculate the Fractional Effective Dose (FED) as occupants move through changing CO, CO2, and O2 concentrations.įuture development will use PyroSim results to alter occupant movement and decision making within the Pathfinder simulation.
The first major task was to create a Results Viewer that could merge and display PyroSim and Pathfinder results simultaneously. We have begun coupling PyroSim fire results with Pathfinder movement. Created with software version: 2020.1 Table of Contents
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