Basement ventilation problem

[Javed Iqbal]

Hi,

 I am trying to model Basement Exhaust for 10X10X3m room. It works fine and  cross checked through smokeview on the volumetric flow rate (m3/sec) by extending computational domain up (refer pics). i have following doubts:

1. How can i exhaust the smoke out in ambiance/outdoor?

2. Is it possible to stop the fire at some point and exhaust should work continuous to take out stale air outside the computational domain.

Thanks in Advance!

--

Javed Iqbal, LEED AP, CEA

Energy Analyst   

[Dave McGill]

Hi Javed,

...

1. How can i exhaust the smoke out in ambiance/outdoor?

It appears that the smoke is accumulating in the space above your exhaust vent. If you place OPEN vents on the domain boundaries above the vent, then the smoke will dissipate into the atmosphere. As an alternative, if you placed your existing vent on the outer wall, the same thing would happen.

In either case, you should consider adding a source of make-up air to your basement.

2. Is it possible to stop the fire at some point and exhaust should work continuous to take out stale air outside the computational domain.

Yes, you can control the fire and the exhaust independently.

Dave

[Mohamed ASSAL]

Hi Javed

Is it possible to stop the fire at some point and exhaust should work continuous to take out stale air outside the computational domain.

Use the RAMP Option to stop the Fire, 

Mohamed

[Javed Iqbal]

Thanks Dave. I followed your instruction and made required changes as per your advice. After making these changes exhaust fan is not getting activated:( i tried with everything but not able to make it activated. please find an input file for the same.

Any help would be highly appreciated!

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[dr_jfloyd]

Please review the User's Manual and carefully review your input file:

Section 7.2.1 Basics:

If two obstructions overlap at one or more faces, the one listed last in the input file takes precedence over
the one listed first.

Your input file:
&OBST XB=8.5,9.5,8.5,9.5,4.0,4.0, SURF_ID='FAN'/ Obstruction
&OBST XB=0.0,10.0,0.0,10.0,4.0,4.0, SURF_ID='INERT'/ Obstruction

Also your input file contains a few lines later:
&VENT SURF_ID='OPEN', XB=8.5,9.5,8.5,9.5,4.0,4.0/ Vent

so even if you hadn't replaced your FAN with the INERT OBST line, this VENT line replaces it with OPEN.

On Monday, July 16, 2012 4:26:49 PM UTC-4, jd wrote:

Thanks Dave. I followed your instruction and made required changes as per your advice. After making these changes exhaust fan is not getting activated:( i tried with everything but not able to make it activated. please find an input file for the same.

Any help would be highly appreciated!

On Mon, Jul 16, 2012 at 7:53 AM, Dave McGill <> wrote:

Hi Javed,

...

1. How can i exhaust the smoke out in ambiance/outdoor?

It appears that the smoke is accumulating in the space above your exhaust vent. If you place OPEN vents on the domain boundaries above the vent, then the smoke will dissipate into the atmosphere. As an alternative, if you placed your existing vent on the outer wall, the same thing would happen.

In either case, you should consider adding a source of make-up air to your basement.

2. Is it possible to stop the fire at some point and exhaust should work continuous to take out stale air outside the computational domain.

Yes, you can control the fire and the exhaust independently.

Dave

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[Javed Iqbal]

Thanks for your valuable feedback. I will proceed as per your guidance.

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[Mohamed ASSAL]

Hi Javed I will send you the input this weekend.

Mohamed


2012/7/16, Javed Iqbal <eee....@gmail.com>: