[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [EnergyPlus_Support] Design Volume Flow Rate
I am not an expert in this area, perhaps someone else can comment on
approximations that they use for this situation. You may be able to find some
suggestions in an HVAC handbook. Based on my limited understanding, the value
you suggest, wind speed times opening area would be the maximum possible value.
There are many factors that will reduce the flow below this limit: resistance
due to opening size, wind direction (if it is not normal to the opening), if
there are equal opening areas on opposite sides of the building, etc.
If this is a critical aspect of your design, you may find it useful to model
each opening in detail using the Airflownetwork:* objects.
Mike
On 13 Dec 2007 at 14:23, Tasos Ioannou wrote:
> Hi Mike,
>
> Yes I see... the Infiltration object is for small portions of air sneaking
> from small small cracks in the doors and windows. So if I use Ventilation
> object, there is still the Design Volume Flow Rate field. Have you any idea how
> this can be calculated. Can I assume that door is completely open and multiply
> the surface of the door (m2) with the wind speed, is this scientifically solid
> way to calculate the Design Volume Flow Rate? And if this is correct then to
> find the Flow rate for the whole Zone I have to add all the calculations from
> each door and window that belong to the Zone? Thank you for spending some of
> your time for my questions.
>
> Tasos Ioannou
>
> On Dec 12, 2007 10:49 PM, Michael J. Witte <mjwitte@xxxxxxxx> wrote:
>
> > INFILTRATION is normally used to represent airflow through cracks in the
> >
> > building envelope and airflow which occurs from occasional opening of
> > doors.
> > The air which enter the house when all windows and doors are open would be
> >
> > better modeled using VENTILATION, or in more details using
> > AirflowNetwork:*.
> >
> > Mike
> >
> > On 12 Dec 2007 at 14:39, tasos.ioannou wrote:
> >
> > > Dear Forum,
> > > I am modeling a Mediteranean house, located in Athens, Greece. I would
> > > like to ask you how can I find values for Design Volume Flow Rates.
> > > This is a field for the INFILTRATION object. The Input/Output reference
> > > document says that this is the maximum infiltration value expected in design
> > > conditions. Does this mean the amount of air that enters the house when all
> > > windows and doors are open? And if you please have any idea for standar
> > > values, or how I could calculate this value for a specific place, in my case
> > > Athens, this would be very helpfull. I hope for an answer, thank you in
> > > advance.
> > >
> > > Best regards
> > >
> > > Tasos Ioannou
> > >
> > >
> > >
> > > The primary EnergyPlus web site is found at:
> > > http://www.energyplus.gov
> > >
> > > The group web site is:
> > > http://groups.yahoo.com/group/EnergyPlus_Support/
> > >
> > > Attachments are not allowed -- please post any files to the appropriate
> > folder
> > > in the Files area of the Support Web Site.
> > >
> > > EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the
> > > Documentation link and press the "search" button.
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> >
> > ========================================================
> > Michael J. Witte, GARD Analytics, Inc.
> > EnergyPlus Testing and Support
> > EnergyPlus-Support@xxxxxxxx <EnergyPlus-Support%40gard.com>
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>
>
>
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
>
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
>
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
>
> EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the
> Documentation link and press the "search" button.
>
> Yahoo! Groups Links
>
>
>
>
>
========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/EnergyPlus_Support/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/EnergyPlus_Support/join
(Yahoo! ID required)
<*> To change settings via email:
mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx
mailto:EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx
<*> To unsubscribe from this group, send an email to:
EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/