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Old   February 3, 2005, 21:57
Default heat release calculation
  #1
caty
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Hello everybody,

I need to model a fire that has a heat release of 100 kW and i don't know how to calculate the velocity that must be set at the inlet to coresspond to a heat release of 100 kw.

Can you help me with this?

Thnak you, Caty
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Old   February 4, 2005, 10:28
Default Re: heat release calculation
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Baris
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I hope i don't confuse what you mean, but follow following steps and see if it is the thing what you ask. you have a source with 100KW.let us use newton's law of cooling 1- Q=m*cp*DeltaT. I assume you have fluid domain since you ask a velocity and this forum is CFD forum. am i right? and i assume you know the Cp of your fluid.

2- take your deltaT to be flame temperature of the fire. 1300~1500 K is flame temperature of the CO and H2.

3. now rest is one equation with one unknown. mass flow rate (kg/s), known inlet size and density from ideal gas let you to calculate velocity?.

if it is not the thing that you asked, then please clearify your question.
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