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How to tell CFAST how much material to burn is there? #2052

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KathMich93 opened this issue May 25, 2023 · 13 comments
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How to tell CFAST how much material to burn is there? #2052

KathMich93 opened this issue May 25, 2023 · 13 comments
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@mcgratta

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@KathMich93
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I have a question: How can I tell CFAST how much burning fuel there is for the fire? I only know about the chemical atoms C, H, O, N and CL, but that is not the material which burns? I would like to tell CFAST how much material is there which can burn. Or do I have to say it with the walls? But we don't have a weight or a mass for the walls, only measures?
Thank you.
@KathMich93
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Might the amount of burning fuel be the area of the fire? As anything which is on the ground of the fire is what burns somewhen?

@mcgratta mcgratta self-assigned this May 25, 2023
@mcgratta
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You specify the heat release rate as a function of time. If you know the heat of combustion, this will enable you to specify the total mass of fuel that is burning.

Also, use the Discussion Group for this kind of question. The Issue Tracker is for bug reports.

@preneke
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preneke commented May 25, 2023 via email

@KathMich93
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Thank you. Where do I find the discussion group? I haven't seen it so far. Yes, the HRR shows how much of the fuel burns. But what does show how much fuel actually is there which can burn?

@drjfloyd
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https://groups.google.com/g/cfast

How much fuel is there is an input that you provide. As the model user, it is up to you to determine what fuel load is appropriate for analysis.

@KathMich93
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Thank you. In the example case, I read a column with Fuel, but there is only the chemical formula like C9H6O2N2. How can I increase or decrease it? Wouldn't it become a different chemical thing if I change the amount of molecules? For example, if I want to have wood or concrete as burning material. How can I describe that as burning fuel? For example, if I have 2kg of it. How can I describe that?

@drjfloyd
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drjfloyd commented May 25, 2023 •
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Please use the forum for questions on using CFAST.

@KathMich93
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I filled in a request to take part in the group.

@KathMich93
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As Katharina Michaelis.

@KathMich93
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KathMich93 commented May 25, 2023 via email

@drjfloyd
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Use a PC to connect to the group or if on your phone choose to load the full web version. The mobile version of groups sometimes has issues.

@KathMich93
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KathMich93 commented May 25, 2023 via email

@mcgratta
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We are going to stop using Google Groups within the year, so if it gives you trouble, you can continue to use the Issue Tracker.

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@mcgratta @drjfloyd @preneke @KathMich93