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Topics - Big Al

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PyroSim / Gas phase device or smoke detector?
« on: September 22, 2021, 04:57:31 am »
Would it be acceptable to use gas phase devices that reads optical density through soot to determine the detection time in an Aset/Rset analysis?

If it is acceptable why?

What are the advantages and disadvantages of using a gas phase detector over a smoke detector that is built into FDS.

Any information is greatly appreciated.

PyroSim / Convective or total hrr
« on: February 12, 2015, 02:15:48 pm »
Can someone please explain if I should use the total hrr or the convective hrr when designing a model. It is my understanding you should use the total hrr. I also understand that properties are assigned to surfaces and materials, therefor FDS will perform the required calculations and predict the difference between the total and convective hrr.
In my opinion if you use convective hrr FDS will predict more favourable conditions than the conditions predicted if total hrr is used.

PyroSim / Error Message
« on: May 03, 2013, 04:25:54 am »
When I run  a model under fds5 and fds6 I get an error message relating to holes and boundries(please see the attached file), in the model there are no holes near the boundries, please help.

PyroSim / Multi Mesh Models
« on: September 20, 2011, 06:28:50 am »
I apologise if this topic has been covered before. When using multiple meshes should all the mesh boundaries be open; or should it just be the external boundaries that are open and the mesh boundaries that are adjacent to each other remain closed or deleted.

PyroSim / Composite Door
« on: August 18, 2011, 03:23:08 pm »
Please can someone help, I want to construct a composite door i.e. Upvc outer panel - polyurethane foam inner - Upvc outer panel.
Any help would be appreciated thanks in advance.

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