[Equest-users] Daylighting Strategy for different zones

[Nick Caton]

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

 

 

NICK CATON, E.I.T.

PROJECT ENGINEER

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

Check out our new web-site @ www.smithboucher.com 

 

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 <http://www.ecoconsulting.net/> 

 

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