[Equest-users] wwr calculation

[deepika khowal]

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
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> 703-243-1200 (office)****
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>
> *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
> >
> >
> >
> >****
>
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