[Equest-users] building shade effect

[R B]

Have not followed the thread in detail - but here are some things I have
found about windows - first off not a whole lot of saving at the
yearly-building level. If you look at the peak breakdown for a window - the
U-value related conductance is 2/3rds vs the solar radiation (1/3rd) -
atleast for the one model that I was looking at. As others have noted,
almost 40-50% of the energy consumption is from lights/plug loads.

You might want to look at just the perimeter zones and see what happens to
the energy consumption reduction in just those zones?

You can also look at just the LS-D reports to see what the % savings are.
Sometimes it helps in saying that reductions are x% of the cooling load
(without considering the HVAC inefficiencies) - which will be a higher
number.




On Thu, May 31, 2012 at 9:16 AM, Nick Caton <ncaton at smithboucher.com> wrote:

>  Feeling confident in your modeling approach is very much important, but
> before running deep into alternate methods, I would seek perspective on
> what % improvement is even feasible.  Perhaps a 1% net improvement is quite
> impressive, all things considered?  Considering static shades can be
> simultaneously helpful and harmful thermally over a year, a few iterations
> exploring different transmittance values may be enlightening.****
>
> ** **
>
> Doing so, you might be able to establish a ceiling for maximum possible
> improvement with such shades, and suggest a more optimized exoskeleton
> spacing or similar.****
>
> ** **
>
> There may also be a lesson in here about how to present results in a
> fashion that both informs and appeases the design team.  Perhaps the shades
> may not have an impressive net annual baseline % improvement, but
> significant thermal comfort and glare issues are averted, and cooling plant
> capacities can be lowered by slicing the summertime solar loads…. I would
> also caution to check the solar loads are indeed cutting down as
> anticipated if you aren’t sure of your approach.****
>
>   ****
>
> Best of luck!****
>
> ** **
>
> ~Nick****
>
> ** **
>
> [image: cid:489575314 at 22072009-0ABB]**
>
> * *
>
> *NICK CATON, P.E.***
>
> SENIOR ENGINEER****
>
> ** **
>
> Smith & Boucher Engineers****
>
> 25501 west valley parkway, suite 200****
>
> olathe, ks 66061****
>
> direct 913.344.0036****
>
> fax 913.345.0617****
>
> www.smithboucher.com* *****
>
> ** **
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Umesh Atre
> *Sent:* Thursday, May 31, 2012 8:30 AM
> *To:* Bobby Sy; equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] building shade effect****
>
> ** **
>
>  ****
>
> Bob,****
>
> What is the project location and how is the building oriented? Do these
> louvers run across the entire height of the building?****
>
> If you have a heavily internal load dominated (office) building, the
> building skin effect might be minimal, but then again the shading design**
> **
>
> you have in this project looks pretty dense and assuming you have a need
> for cooling, my gut feeling is that 1% is on the lower side. ****
>
>  ****
>
>  ****
>
>  ****
>  ------------------------------
>
> *From:* equest-users-bounces at lists.onebuilding.org [
> mailto:equest-users-bounces at lists.onebuilding.org<equest-users-bounces at lists.onebuilding.org>]
> *On Behalf Of *Bobby Sy
> *Sent:* Wednesday, May 30, 2012 10:19 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] building shade effect****
>
> Hello everyone!****
>
>  ****
>
> I am working on a project, a high rise office building. The architect
> added louvers as part of the design which I admire for sophistication.
> Attached is a picture that shows the louvers outside for shading. But, when
> I did the initial run, the effect of the louvers is only around 1% energy
> improvement from the baseline.****
>
>  ****
>
> Please let me know if there is a better way to do it in eQuest. What I did
> was to measure the louver thickness and proportioned it to the glass area
> that it covers. I put the fraction as "Transmittance:" in Building and
> Fixed Shades properties. Doe 2 help says: ****
> TRANSMITTANCE****
>
> Fraction of incident solar radiation that is transmitted by the shading
> surface. The default value is 0.0, which means the surface is opaque. A
> value greater than 0.0 represents a device that passes some solar
> radiation, such as a tree, lattice, or fabric. Using SHADE-SCHEDULE allows
> seasonal variation in transmittance. Daylighting calculation assumes
> TRANSMITTANCE = 0.****
>
>  ****
>
> The design team quite find it hard to believe that the louvers have very
> minimal effect. I told them to consider the window to wall ratio (almost
> 60%) and that fact that they will be using a clear glass, even with these
> louvers partial UV rays still pass through the gaps that spreads allover
> the glass surface that adds to the heat load for air conditioning. Ive
> noticed to some of my other projects in tropical countries, building shades
> don't have much effect to energy efficiency. Did anyone encounter the same
> result with building shades? ****
>
>  ****
>
>  ****
>
> Thanks,****
>
>  ****
>
> Bob****
>
> _______________________________________________
> Equest-users mailing list
> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
> To unsubscribe from this mailing list send  a blank message to
> EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120531/06c7d2f2/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 1459 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120531/06c7d2f2/attachment-0002.jpeg>