[Equest-users] wwr calculation

[Pasha Korber-Gonzalez]

Do they provide mechanical cooling for your garage at work?   or does it
have windows with no roof area....I'm sure your garage at work is not
considered a "regularly occupied, fully conditioned (i.e. T-stat controlled)
space".

Pasha

On Thu, Oct 20, 2011 at 4:51 AM, James Hansen <JHANSEN at ghtltd.com> wrote:

> I model garages all the time.  I haven't done a building in a while that
> didn't have some sort of conditioned space in the garages that needed an
> adjacent unconditioned space (but without exterior walls) to properly
> analyze.  Plus for LEED these days, they want all of your building areas in
> the model to match those entered by the architect in the PI forms.  So you
> are supposed to model garage elevator lobbies, semi-heated mechanical
> spaces, main electric rooms, unheated garage space, etc.  ****
>
> ** **
>
> Also, my garage at work has windows :)****
>
> ** **
>
> -James****
>
> ** **
>
> *From:* Pasha Korber-Gonzalez [mailto:pasha.pkconsulting at gmail.com]
> *Sent:* Thursday, October 20, 2011 6:33 AM
> *To:* deepika khowal
> *Cc:* James Hansen; equest-users at lists.onebuilding.org
>
> *Subject:* Re: [Equest-users] wwr calculation****
>
> ** **
>
> I disagree with both of you.
>
> First of all, who models Garages in their models anyway?  What a waste of
> time.---this scews the gross floor area, and nothing in a parking garage
> impacts the HVAC equipment loads of the conditioned spaces....you can always
> input your garage vent fans and lighting as single exterior load input
> numbers in your model which simplifies the whole modeling project and
> billable time spent WITHOUT compromising on the calculations of energy
> use....
>
> Second of all---poor example for offering windows in a parking garage--this
> is never real life, and a non-applicable example doesn't "hold water".   At
> least give an example that is comparable to real life situations...  Parking
> garages are either open air, or underground (without fenestration...)   Have
> you ever had a project where Mechanical cooling needed to be provided to a
> parking garage?  I hope not because these are considered transient space
> types.
>
> If you are modeling your LEED buildings according to appendix G --90.1 you
> do not include the above grade garage wall area in your gross building WWR
> calculation.
>
> FOURTH---Deepika---you are modeling a residential home from your picture
> you sent us.   YOU CANNOT USE ASHRAE STANDARD 90.1 TO MODEL LOW-RISE
> RESIDENTIAL BUILDINGS!
>
> You are using and interpreting the wrong standard, you need to use ASHRAE
> Standard 90.2 for Non-commerical Residential buildings.    You will need to
> use this new reference as everything you are referring to does not apply for
> your project or your project model.
>
> The real answer to your question is the Nebraska Cornhusker football team
> IS BETTER than the Virgina Tech Hoakies!     GO BIG RED!!!!
> Pasha****
>
> On Wed, Oct 19, 2011 at 3:15 PM, deepika khowal <deepika.khowal at gmail.com>
> wrote:****
>
> I agree with James .****
>
> if its unconditioned space, we should not claim the window area . that way
> we can have higher WWR for rest of conditioned spaces.****
>
> ** **
>
> ** **
>
> On Wed, Oct 19, 2011 at 1:56 PM, James Hansen <JHANSEN at ghtltd.com> wrote:*
> ***
>
> I don't think I agree with this advice****
>
>  ****
>
> Under ASHRAE 90.1-2007, Section 5.2.1, part of the requirements for the
> PRESCRIPTIVE method requires that "the vertical fenestration area does not
> exceed 40% of the gross wall area for each *space-conditioning category*".
> ****
>
>  ****
>
> The definition for "space conditioning category" simply says:****
>
>  ****
>
>                 non-residential conditioned space,****
>
>                 residential conditioned space, and****
>
>                 nonresidential and residential semiheated space****
>
>  ****
>
> It doesn't list unconditioned space.  Now I know this info is listed in the
> prescriptive requirements, but if it was my model, and I had a garage that
> had 100% window area, there is no way I would count that towards the gross
> WWR, particularly if I was applying for LEED, and these inconsequential
> windows pushed my WWR above 40% and thus penalized my proposed building.  In
> fact, I might not even model the windows, unless I felt they were going to
> superheat the garage and start impacting adjacent space cooling loads.****
>
>  ****
>
> Just my opinion...****
>
>  ****
>
> *GHT Limited
> **James Hansen, P.E., LEED AP*
> Senior Associate
> 1010 N. Glebe Road, Suite 200
> Arlington, VA  22201-4749
> 703-243-1200 (office)****
>
> 703-338-5754 (cell)
> 703-276-1376 (fax)****
>
> www.ghtltd.com****
>
>  ****
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *PKConsulting
> *Sent:* Wednesday, October 19, 2011 4:04 PM
> *To:* deepika khowal
> *Cc:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] wwr calculation****
>
>  ****
>
> It doesn't change for unconditioned or conditioned.  It is only a function
> of gross wall area (ft2) and window area (ft2).   Don't think too hard about
> this.  You are looking for a needle in the wrong haystack.   This one is
> straight forward with no tricks...****
>
>  ****
>
> WWR is for whole bldg not space by space.****
>
>
> Pashalu****
>
>
> On Oct 19, 2011, at 12:20 PM, deepika khowal <deepika.khowal at gmail.com>
> wrote:****
>
> Thanks Pasha****
>
>  ****
>
> yes , i have been using LV-d report.****
>
>  ****
>
> Am confused how it work for an unconditioned space.****
>
> Thanks****
>
> On Wed, Oct 19, 2011 at 11:01 AM, PKConsulting <
> pasha.pkconsulting at gmail.com> wrote:****
>
> It should be the gross wall area for everything above ground.  Use the lv-d
> report to find the numbers to calculate the overall WWR for your entire
> bldg.   There is a summary page at the end of the lv-d report.  Look for the
> line called-'all walls'.  You can use those numbers to calc WWR percentage.
>
> Pashalu****
>
>
> On Oct 19, 2011, at 11:39 AM, deepika khowal <deepika.khowal at gmail.com>
> wrote:
>
> > Hi all
> >
> > I have a question about calculating WWR.
> > for example, if the south wall area is 700sf and total window area is
> 70sf then the WWR should be 10%.
> > but if 50% of south wall is part of a garage and is unconditioned, then
> in calculating WWR , should I include only the wall area for conditioned
> space or it should include complete facade?
> > Thanks
> >
> > Deepika
> >
> >
> >
> >****
>
> > <image.png>
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> ** **
>
> ** **
>
> ------------------------------
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> communication or any part thereof is strictly prohibited and may be
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