Basement ventilation problem: Fan problem

[Javed Iqbal]

Hi All,

I am trying to model Basement ventilation and vector slices shows outward flow but it seems smoke is not getting out. Any input will be highly appreciated. I can share my input file if someone wants to have a look into.

Thanks in Advance!

On Tue, Jul 17, 2012 at 3:01 PM, Mohamed ASSAL <assa...@gmail.com> wrote:

Hi Javed I will send you the input this weekend.

Mohamed


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

> 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 <dwt.m...@gmail.com> 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
>>>
>>  --
>> You received this message because you are subscribed to the Google Groups
>> "FDS and Smokeview Discussions" group.
>> To view this discussion on the web visit
>> https://groups.google.com/d/msg/fds-smv/-/RpC69_sfcywJ.
>> To post to this group, send email to fds...@googlegroups.com.
>> To unsubscribe from this group, send email to
>> fds-smv+u...@googlegroups.com.
>> For more options, visit this group at
>> http://groups.google.com/group/fds-smv?hl=en.
>>
>
>
>
> --
>
>
> Javed Iqbal, LEED AP, CEA
> Energy Analyst
>
> --
> You received this message because you are subscribed to the Google Groups
> "FDS and Smokeview Discussions" group.
> To post to this group, send email to fds...@googlegroups.com.
> To unsubscribe from this group, send email to
> fds-smv+u...@googlegroups.com.
> For more options, visit this group at
> http://groups.google.com/group/fds-smv?hl=en.
>
>

--
You received this message because you are subscribed to the Google Groups "FDS and Smokeview Discussions" group.
To post to this group, send email to fds...@googlegroups.com.
To unsubscribe from this group, send email to fds-smv+u...@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/fds-smv?hl=en.

--

Javed Iqbal, LEED AP, CEA

Energy Analyst   

[Dave McGill]

I'll have a look if you supply the file.

[Javed Iqbal]

Dear Dave,

Please find the same.

Thanks!

On Wed, Jul 25, 2012 at 4:55 PM, Dave McGill <dwt.m...@gmail.com> wrote:

I'll have a look if you supply the file.

--

You received this message because you are subscribed to the Google Groups "FDS and Smokeview Discussions" group.
To post to this group, send email to fds...@googlegroups.com.
To unsubscribe from this group, send email to fds-smv+u...@googlegroups.com.

To view this discussion on the web visit https://groups.google.com/d/msg/fds-smv/-/buHAceO6nkoJ.
For more options, visit https://groups.google.com/groups/opt_out.
 
 

[Dave McGill]

Hi Javed,

There are a few things to consider. You created an exhaust fan. It draws air out of the room, and it is assumed to disappear into the wall, as if into a duct. I assume you want to see the smoke appearing on the other side of the wall. See section 9.1.5 Jet fans. In the attached file, I have changed your exhaust fan into a jet fan.(In PyroSim, when you are defining the SURF select fan instead of exhaust.) I have also disabled all of your obstructions imported from CAD. They make it very difficult to sort out the surfaces.

I've also added a velocity slice file perpendicular to the jet fan. That is an easy way to see if it is working. I moved your flow measuring device so that it is flush with and covers the face of the jet fan. I've attached a simplified version of the file.

Dave

[Javed Iqbal]

Thanks a Ton Mr. Dave. Much appreciated. It is working fine and fan shows the desired volumetric flow of 14 m3/sec. I have used Ramp function and want to see how much time does jet fan take to pump out smoke after 20 seconds of burning. I can only see smoke  running around in computational domain. How can i visualize this.

Thank you once again for your help!

--
You received this message because you are subscribed to the Google Groups "FDS and Smokeview Discussions" group.
To post to this group, send email to fds...@googlegroups.com.
To unsubscribe from this group, send email to fds-smv+u...@googlegroups.com.

For more options, visit https://groups.google.com/groups/opt_out.
 
 

[Derwin Parkin]

So, what would you all do in this situation, now that Pyrosim no longer supports fan surfaces?

Is starting an HVAC module the only option?

[dr_jfloyd]

FDS 6 no longer contains the POROUS SURF construct that was used in FDS 5.  That capability is now handled with the HVAC subroutines.