[Equest-users] Above Roof Canopy Modeling

[reniel barroso]

Hi!

Thanks for your replies.
It helps us a lot.

On the model that we're working on,
We already did what everyone suggested.
We modeled the canopy as fixed shading.

To double check if the model is running as what we're expecting based on cooling load fundamentals,
We modeled full opaque canopy (0 transmittance) and 1.0 transmittance for comparison purposes only.

After running the model, we had weird results:

0 transmittance
Chilled Water - 104.05 MBTU
Space Heating - 74.8 kwh (X000)

1.0 transmittance
Chilled Water - 109.9 MBTU
Space Heating - 96.2 kwh (X000)

Am I modeling it wrong?
Am I missing something?
Are we having the same results especially with the heating consumption?
What are the areas that I should check first before concluding?
Note that we modeled the systems for both as AUTOSIZING.

Thanks for your assistance.


Reniel

 



________________________________
From: "Shinn, Kim" <kim.shinn at tlc-eng.com>
To: Nick Caton <ncaton at smithboucher.com>; Dakota Kelley <dakotak at teliospc.com>; reniel barroso <renielbarroso at yahoo.com>; "equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org>
Sent: Wednesday, February 17, 2010 21:44:23
Subject: RE: [Equest-users] Above Roof Canopy Modeling


At the risk of piling on more information than you really wanted:
 
App G allows you to take advantage of shading – so, remove shading from your 90.1 baseline.
 
You can assign schedules, transparency and reflectance to shades.  If you want to model the effect of deciduous trees planted near the building, for instance, you can use a schedule to have greater transparency in the winter (for passive solar heating) and less transparency in the summer for shading.
 
Kim E Shinn, PE, LEED AP BD+C, CxA
Senior Sustainability Consultant
 
From:Nick Caton [mailto:ncaton at smithboucher.com] 
Sent: Wednesday, February 17, 2010 11:29 AM
To: Dakota Kelley; Shinn, Kim; reniel barroso; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Above Roof Canopy Modeling
 
Thanks Dakota!
 
This is good to know as I have a situation where it would probably be less work to explore some specific overhang/fin options within my complex eQuest model vs. trying to build a separate model through my more usual daylight analysis workflows.
 
Bonus points for your response being 10x more clear than my question =)!
 
~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:Dakota Kelley [mailto:dakotak at teliospc.com] 
Sent: Wednesday, February 17, 2010 11:16 AM
To: Nick Caton; Shinn, Kim; reniel barroso; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] Above Roof Canopy Modeling
 
Window shades only shade their parent window, not the walls.  Building shades will shade everything in their shadow, and they rotate with the building if the azimuth is changed.  Fixed shades also shade everything in their shadow, but they do not rotate with the building.
 
                                
                        DAKOTA KELLEY                                                              
                                Project Designer
 
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http://www.teliospc.com          3535 Travis St. Suite 115 
dakotak at teliospc.com             Dallas, TX 75204 
 
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From:Nick Caton [mailto:ncaton at smithboucher.com] 
Sent: Wednesday, February 17, 2010 11:10 AM
To: Shinn, Kim; reniel barroso; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Above Roof Canopy Modeling
 
Here is another illustration shading a courtyard of sorts.  You’re looking at the dark grey rectangle in both examples.
 
I have a followup actually for others familiar with creating building shades – are they any different in behavior from a window shade, or are they the same thing simply defined in different ways?  More specifically, do window shades shade buildings and can I define building shades as a means of modeling multiple vertical fins/horizontal light shades per window?  
 
 
~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 Shinn, Kim
Sent: Wednesday, February 17, 2010 9:03 AM
To: reniel barroso; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Above Roof Canopy Modeling
 
Reniel:
 
What you need is an exterior shade.
 
In detailed edit mode, go to Building Shell and select Fixed Shades (or a Building Shade, depending on whether you want the shade to be attached to the building – as it rotates, for instance).  A fixed shade remains fixed in space.  This is a good way to model adjacent buildings.
 
 
Right click on Fixed Shade and go through the dialog boxes.
 
Kim E Shinn, PE, LEED AP BD+C, CxA
Senior Sustainability Consultant
 
From:reniel barroso [mailto:renielbarroso at yahoo.com] 
Sent: Wednesday, February 17, 2010 8:22 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Above Roof Canopy Modeling
 
Hi to All,
 
We are modeling 3 buildings interconnected with each other.
A large canopy is covering the roof of the buildings and partially shading the courtyard within these buildings.
 
Can we model this canopy in eQuest? How?
Can we model its effect on the cooling load of spaces facing the courtyard?
We are expecting that solar heat gain will be lower on fenestrations of the rooms/spaces facing courtyard due to shading compared to perimeter spaces facing outside the development.
 
Thanks in advance.
 
 
Reniel
 
 
 
 

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