How to model flame detector UV/IR

[togersen]

Is there anybody who has tried to model a flame detector UV/IR in FDS? I am working on a case with atrium sprinkling where I need to find the activation time. The atrium sprinkling is activated by flame detector. If it’s not possible is there some kind of “workaround”

/Michael 

[togersen]

No body who has some creative ideas?

[Sean McCready]

I don't think FDS has spectrum analysis.  If you want to get creative, create a flame front vdieo in smoke view, with the proper viewing angle that the device has through the focal length camera options.  I'm sure this would be a fairly easy manual evaluation if the manufacturer could give some sort of threshold of detection.  That will probably be the challenging part.

SJM

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[Ben Ralph]

Could you use radiation as a surrogate for IR/UV sensitivity for a typical carboniferous flaming fire via an empirical relationship provided by the manufacturer? You'd have to GREATLY increase your radiation angles and have a very well resolved flaming/burning zone.

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[dr_jfloyd]

The manufacturer literature probably indicates a fire size and distance that the detector will detect. You could use the point source approximation to scale the fire size to the distance in the atrium and just assume detection when the fire reaches that size.

On Friday, April 13, 2018 at 4:43:45 AM UTC-4, Ben Ralph wrote:

Could you use radiation as a surrogate for IR/UV sensitivity for a typical carboniferous flaming fire via an empirical relationship provided by the manufacturer? You'd have to GREATLY increase your radiation angles and have a very well resolved flaming/burning zone.

On 13 April 2018 at 07:40, Sean McCready <ness...@gmail.com> wrote:

I don't think FDS has spectrum analysis.  If you want to get creative, create a flame front vdieo in smoke view, with the proper viewing angle that the device has through the focal length camera options.  I'm sure this would be a fairly easy manual evaluation if the manufacturer could give some sort of threshold of detection.  That will probably be the challenging part.

SJM

On Fri, Apr 13, 2018 at 2:28 AM, togersen <toge...@gmail.com> wrote:

No body who has some creative ideas?

onsdag den 11. april 2018 kl. 15.36.08 UTC+2 skrev togersen:

Is there anybody who has tried to model a flame detector UV/IR in FDS? I am working on a case with atrium sprinkling where I need to find the activation time. The atrium sprinkling is activated by flame detector. If it’s not possible is there some kind of “workaround”

/Michael 

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