[Equest-users] Modifying existing historic windows

[Morteza Kasmai via Equest-users]

Thank you Nick,

Your recommendations are very helpful as usual. I am trying to get more
accurate numbers from the manufacturer, just wanted to be sure that
assuming the selected values are valid, the calculation would be acceptable.

Thanks again for your kelp

Morteza




On Thu, Sep 7, 2017 at 6:02 PM, Nicholas Caton <
Nicholas.Caton at schneider-electric.com> wrote:

> The “assembly 0.67” for a single layer of glass leaves me a little
> uncertain – I think if you dig deeper you might find the manufacturer may
> have some helpful context around that figure.  Do they suggest the net
> impact of the low-e glass, associated framing, trapped air layer, and
> conductive transfer of the seals in contact with the existing assembly nets
> an effective U-0.67 for a given/standard window size?  If so, your math
> looks pretty okay for the assumptions stated (just expand on what that 0.67
> means in documenting your approach)!  If not or if this isn’t made very
> clear, you may need to perform a more involved analysis to account for one
> or more of those items.
>
>
>
> For savings accuracy with existing/historical window retrofits (not always
> a priority with LEED certification, understandably), I might also be
> interested (resources permitting) to test a mockup installation before &
> after to explore the impact on infiltration reduction in your model.  That
> may more fully capture the cost:benefit ratio if the value of the measure
> is under active consideration.
>
>
>
> ~Nick
>
>
>
> *Nick Caton, P.E., BEMP*
>
>   Senior Energy Engineer
>   Regional Energy Engineering Manager
>
>   Energy and Sustainability Services
>   Schneider Electric
>
> D  913.564.6361 <(913)%20564-6361>
> M  785.410.3317 <(785)%20410-3317>
> F  913.564.6380 <(913)%20564-6380>
> E  nicholas.caton at schneider-electric.com
>
> 15200 Santa Fe Trail Drive
> <https://maps.google.com/?q=15200+Santa+Fe+Trail+Drive+%0D+Suite+204+%0D+Lenexa,+KS+66219+%0D+United+States&entry=gmail&source=g>
> Suite 204
> Lenexa, KS 66219
> United States
>
>
>
>
>
> *From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] *On
> Behalf Of *Morteza Kasmai via Equest-users
> *Sent:* Thursday, September 07, 2017 4:44 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Modifying existing historic windows
>
>
>
>
> Dear all,
>
> I am modeling a historic building and the scope of work is to modify the
> existing windows by adding a storm window to the existing industrial steel
> sash windows. The storm window is one layer Low-E glass with aluminum
> framing with brake (assembly U-0.67).
> Assuming the existing one layer clear glass window has U-value of 5.8, can
> I assume the assembly R-value of the window system as the total R-values of
> both of the windows as following, and would it be acceptable by the LEED
> reviewer?
>
> Total R-Value: 1/5.8 + 1/0.67 = 0.172 + 1.49 = 1.662
> U-Value = 1/1.662 = 0.6
>
> I would appreciate your help in this matter,
> Morteza
>
>
>
>
>
>
>
>
> ______________________________________________________________________
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