A Member Only Benefit
The member only webinars with Professional Development Hours (PDH) credits: an exclusive series of online technical webinars focused on helping SFPE members strengthen professional skills and stay on top of industry trends. Professional expert speakers will lead the webinars, highlighting top technical content that is essential for keeping your skills up to par.
Earn Continuing EducationProfessional Development Hours (PDHs) are only granted to individuals who attend the live webinar and are logged in for 50 minutes longer.
Recordings of previous webinars are available to members here
Monday, November 27, 2017 11:00 am Eastern Time (-05:00 GMT)
A Study of Reproducibility of a Full-Scale Multi-Room Compartment Fire Experiment
Presented by Nils Johansson, Ph.D., Associate Senior Lecturer, Lund University
A study of 45 full-scale compartment fire tests will be presented. All tests were conducted in the same experimental setup but with four different ventilation scenarios. The experimental setup consisted of a three-room compartment connected to a stairway. The tests were conducted during a six-year period under slightly different ambient conditions. The purpose of the study was to quantify the reproducibility of these tests with the aim to illustrate the degree of variability that can be expected in this type of experiment and how the variability is affected by different ventilation scenarios.
The 95% confidence interval of the measured temperature rise in the tests covered ±7-35% around the mean, depending on place of measurement and studied scenario. The variation in the results is due to both the variation of different weather conditions and other unknown parameters. It has not been possible to statistically distinguish between these two sources of variation in this work. The variation gives an estimate of the random error that can be expected in this type of experiment, which is something that is considered important for fire engineers to keep in mind when analyzing or referring to fire tests. The link to register is available here.
Monday, December 18, 2017 11:00 am Eastern Time (-05:00 GMT)
Modeling Gas Release from Lithium-Ion Batteries during Thermal Runaway Using FDS
Presented by Gerard Back (Jerry), CFEI, CVFI, Senior Fire Protection Engineer, Jensen Hughes
The results of an extensive full-scale lithium-ion battery thermal runaway tests series was used to generate input data for the Fire Dynamics Simulator (FDS) model, and to calibrate and verify the accuracy of the model predictions. The FDS model was found to be able to accurately predict the internal temperature rise as well as the external skin temperature of the Unmanned Underwater Vehicle (UUV) caused by the hot gas released during a thermal runaway reaction. Additionally, the FDS model predicted that the adjacent battery modules inside the UUV would not reach thermal runaway, agreeing with the test results.
Using the predictive abilities of the FDS model, additional battery configurations were evaluated to determine the level of fire hazard. Due to the high cost of the batteries and the UUV hardware it was not possible to perform these tests at full scale, but the FDS model simulations provide insight into the extent of the thermal runaway reactions in larger battery configurations. FDS was also used to assess the effectiveness and optimize the design of different ventilation system configurations installed in the UUV storage/shipping container.
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