[Equest-users] Daylighting Strategy for different zones

[Carol Gardner]

I agree with Nick. There does seem to be some confusion. Omar, please send
us clarification as you are able. Daylighting is daylighting and there are
inputs within eQUEST to use. I have heard, not remembering where at this
moment, that the only thing to do re daylighting in the wizards is to turn
it on. Say daylighting = yes.

What I read & responded to with the schedule response was on/off control for
bathrooms. That's an occupancy sensor and a schedule modification. Depending
on who you are modeling for, a reduction in schedule is appropriate. View
Oregon SEED Appendix L for info.

In sum, I read Omar's query as a two parter: one part occ sensor, one part
daylighting.

As always, I am available for correction.

Regards,
Carol

On Tue, May 11, 2010 at 1:30 PM, Nick Caton <ncaton at smithboucher.com> wrote:

>  Carol/Omar,
>
>
>
> We should take care to avoid confusion/misunderstanding from mixing similar
> topics – the advice I responded with earlier applies specifically to
> daylighting controls, where Carol’s applies to occupancy sensor controls.
>
>
>
> I would personally consider modeling on/off daylighting controls using a
> schedule, when the daylighting control inputs are easy to specify with
> greater resulting model accuracy over a modeled year, to be a somewhat
> “contrived” and time-inefficient solution.  That’s not to say this would be
> necessarily inappropriate – there are many cases where modeling daylight
> controls requires a “contrived solution,” as there are definite limitations
> to what can and can’t be modeled explicitly for hourly daylight controls
> behavior within eQuest.
>
>
>
> To be blunt:  If someone is using a schedule to model daylighting control
> behavior in eQuest, it means either
>
> (A) they do not understand the tools available to them, and/or
>
> (B) they understand the limitations in eQuest’s daylighting inputs /
> modeled behavior and are compensating for such shortcomings as they may
> apply, and/or
>
> (C) they’re using a more specialized program outside of eQuest to determine
> such hourly fractional figures.
>
>
>
> As with many things, note there are limitations to what you can really do
> in the wizards.  Detailed mode allows for multiple and distinct daylighting
> control schemes per space/shell as needed, with all the wizard preset
> behaviors available as well as the ability to tweak them or define your own
> dimming/switching behaviors.
>
>
>
> ~Nick
>
> [image: cid:489575314 at 22072009-0ABB]**
>
> * *
>
> *NICK CATON, E.I.T.***
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> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Carol Gardner
> *Sent:* Tuesday, May 11, 2010 10:54 AM
> *To:* Omar Katanani
> *Cc:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Daylighting Strategy for different zones
>
>
>
> Omar,
>
> Some of what you want to do e.g. on/off using an occupancy is best done
> using a schedule. A 15 % reduction is always acceptable, and you could argue
> for more if the case can be made for it. For instance if your schedule value
> for noon is .80 just reduce it by (.80*(1-.15)). If you know that the
> reduction should be more than 15 % and can clearly state why then you
> should.
>
> I use specify exact site coordinates, on screen 1 of 25 in the DD wizard,
> so that I am sure the polygon I am creating is where I want it, I set it to
> 0,0,0 for the 1st polygon, lower left corner, and go from there. Try putting
> in the exact coordinates for the lower left corner of each space.
>
> Regards,
> Carol
>
> On Tue, May 11, 2010 at 2:18 AM, Omar Katanani <omar at ecoconsulting.net>
> wrote:
>
> Dear all,
>
>
>
> I was wondering whether I can change the daylighting strategy for each zone
> alone. For example, on/off for the bathrooms, dimming for the kitchen…etc.
>
>
>
> Moreover, can someone please explain to me more about the “specify exact
> site coordinates” ? Is there a global reference, or the second shell has the
> origin of coordinates that of the first shell?
>
>
>
> Many thanks,
>
> ___________________________
>
> Omar Katanani
> Sustainable Design Engineer
>
> Email: omar at ecoconsulting.net
>
>
>
> EcoConsulting (Lebanon)
> Chawkatly Building (Valli & Valli), 6th floor
>
> Charles Helou Street, Saifi District
>
> Beirut, Lebanon
> Mobile:    +961 (0) 3 045 045
>
>
>
> EcoConsulting (UK) Ltd
> 28 Marshalsea Road
> London, SE1 1HF
> Tel:  +44 (0) 207 939 0989
> Fax:  +44 (0) 207 939 0981
>
> Website: www.ecoconsulting.net
>
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