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Author Topic: HRR curve definition  (Read 2852 times)

Lishi

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HRR curve definition
« on: September 27, 2014, 10:05:54 pm »

Excuse me,

I want to define the HRR curve like I show in the figure, but i don't know how can I do it in Pyrosim.  :(
I know that i must define the HRRPUA, and I select rump-up time: t^2, and define a time, but, What is the meaning of this time? How know I Which is the duration that the program considered to the constant part? When is it start?.

Thanks.
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Dave McGill

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Re: HRR curve definition
« Reply #1 on: September 28, 2014, 05:47:30 am »

Hi,

The product of HRRPUA and area of the fire must equal 10,000 kW (10 MW) and the t^2 ramp-up time should be 180 s (3 min). The fire will start at t=0, will reach 10,000 kW at t=180 s and will remain there. (This assumes that there is enough oxygen present to support the fire and that nothing else is burning.)

Dave
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Dave McGill
firemodel.ca

Lishi

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Re: HRR curve definition
« Reply #2 on: September 28, 2014, 11:24:02 am »

Thanks a lot Dave.

Your help has been very useful.
The key was in the mount of oxygen.

Thanks again, have a good day!.




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