Interflam 2016
It was great to attend to Interflam 2016 at Royal Holloway College, UK on 4 - 6 July 2016. The participation was great and so it was the level of the presentations. I was on the session "Predictions of Soot Generation & Visibility" together with Jason Floyd (Jensen Hughes, USA), Jason Huczek and Marc Janssens (SwRI - Southwest Research Institution, USA). I presented something similar to presented last May in Warsaw but with a different focus: the ASET (Available Safe Egress Time) and the influence of the soot yield in it (through smoke visibility).
I will share my presentation soon but for the time being I just want to share this new findings, i.e. how the ASET changes when changing the soot yield.
As can be seen in the table using a chemical reaction with a soot yield value of 0.02 g/g it takes roughly 300 s for the visibility (for reflecting signs) to reach 10m, whilst with a soot yield value of 0.04 g/g, would take approximately 68 s and just 16 s with a soot yield of 0.10 g/g. This means that for the same fire scenario the implications of choosing a reaction instead of another can lead to a huge over prediction of the Available Safe Egress Time and therefore a huge under estimation of the Fire Safety of the building.
I also show you some pictures of the tests we uses, performed by Wojciech Węgrzyński (coauthor of all this work).
I will share my presentation soon but for the time being I just want to share this new findings, i.e. how the ASET changes when changing the soot yield.
Soot Yield (g/g)
|
0.01
|
0.02
|
0.03
|
0.04
|
0.05
|
0.06
|
0.07
|
0.08
|
0.09
|
0.10
|
Time to reach 10m Visibility (s) – FDS*
|
600
|
300
|
138
|
68
|
42
|
26
|
24
|
20
|
20
|
16
|
Time to reach 10m Visibility (s) – Fluent*
|
600
|
267
|
99
|
34
|
24
|
21
|
18
|
17
|
16
|
16
|
Soot Yield (g/g)
|
0.11
|
0.12
|
0.13
|
0.14
|
0.15
|
0.16
|
0.17
|
0.18
|
0.19
|
0.20
|
Time to reach 10m Visibility (s) – FDS*
|
16
|
16
|
14
|
12
|
12
|
10
|
8
|
8
|
8
|
8
|
Time to reach 10m Visibility (s) – Fluent*
|
15
|
15
|
13
|
12
|
12
|
10
|
9
|
9
|
9
|
8
|
As can be seen in the table using a chemical reaction with a soot yield value of 0.02 g/g it takes roughly 300 s for the visibility (for reflecting signs) to reach 10m, whilst with a soot yield value of 0.04 g/g, would take approximately 68 s and just 16 s with a soot yield of 0.10 g/g. This means that for the same fire scenario the implications of choosing a reaction instead of another can lead to a huge over prediction of the Available Safe Egress Time and therefore a huge under estimation of the Fire Safety of the building.
I also show you some pictures of the tests we uses, performed by Wojciech Węgrzyński (coauthor of all this work).
Comparison of methanol (Ys = 0,001), iso-propanol (Ys = 0,015), heptane (Ys = 0,044) and toluene (Ys = 0,178 g/g) fires |
Great post!
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