Fire Extinguishing Coefficient

[Martin]

Hello FDS Users,

 

I modeled a fire with a specific spread rate and HRR on a Vent. Above the Fire there are Sprinklers installed. Bryan Klein from PyroSim recommended me to diminish the Fire by using the Fire Extinguishing Coefficient. In that way the scenario might be more realistic. Apparently I can't find any values for that coefficient. Can anyone tell me if he/she has already gathered experiences with the Fire Extinguishing Coefficient?!

 

Best regards

 

Martin Rudert

 

 

[Kevin]

There is virtually no data for this parameter. You would need to run experiments of your own to estimate it.

[max3...@googlemail.com]

Any news on that one? Would be interesting to know

[Randy McDermott]

I do not see the post you are talking about.  Please post the original question again.

On Tue, Nov 10, 2015 at 8:07 AM, <max3...@googlemail.com> wrote:

Any news on that one? Would be interesting to know

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[max3...@googlemail.com]

Martin

10/23/12

[dr_jfloyd]

There are very few published tests where there was a quantitative measurement of the impact of sprinklers on the heat release rate.   The routine in FDS is based on the work described here: 

http://fire.nist.gov/bfrlpubs/fire93/PDF/f93014.pdf

[Kevin]

E_COEFFICIENT was a concept I introduced in FDS even before it was FDS. We needed something to model fire suppression. At the time, there was some research in developing empirical models of suppression, all of which involved some sort of exponential decay assumption. There is some physical validity to this assumption, but the concept of E_COEFFICIENT (and all other suppression models) never really gained traction.

If you want to model suppression of a real fire burning real stuff, I strongly suggest that you get some real stuff and burn it under a calorimeter with different amounts of water applied. I cannot imagine how you could determine an appropriate E_COEFFICIENT any other way. It is a value that would be very difficult to tabulate in a handbook.