[Equest-users] how to model 40% glazing on baseline

[Nick Caton]

There's a few opinions on "best" approach... every case is unique, but
here's general my take:

 

-          Figure out your gross window-wall-ratio (WWR) for the whole
building.   Let's say it's 60% for illustration.

-          If the WWR < 40%, your baseline can simply use the same
window layout defined in the proposed model, and this would be a moot
concern

-          If the WWR > 40%, divide the two to figure a window area
"correction factor:"  40%/60% = .6667

-          Assuming you're post-wizards and in detailed edit mode:
You'll multiply the height dimension of all windows in your proposed
model by that correction factor...  (width works too, but height is
generally better - I'll explain)

o   Highlight a window under the Building shell tab

o   Switch to spreadsheet view

o   Highlight the column containing the window heights (use shift+arrow
keys here)

o   Ctrl+c

o   Open excel

o   Ctrl+v in A1

o   In B1:  =A1*.6667

o   Drag that down to get all your new values

o   Rearrange your windows on your computer screen so you can see the
excel column and the equest column side-by-side

o   You probably are using a common height for many/most windows.  Right
click any value -> edit user default - click the radio button that lets
you define a number, and input that most common (reduced) value in your
"factored" excel column

o   Right click any equest cell and press 'r' to restore default - value
will turn blue to represent a 'user-default' (instead of a green DOE2
default)

o   Ctrl+c that defaulted cell

o   Now start from the top and play accountant:  enter the value, press
the down arrow key, rinse and repeat.  Anytime you see the common
default value, just ctrl+v.

-          Once you're done, the WWR of your baseline will be adjusted
down to match 40%, and you'll have maintained the same WWR on each
orientation as your proposed model.

 

If you're building your baseline from the wizards on up, you could also
achieve uniform bands on each face totaling 40% net by playing with the
inputs in the right shell screens.  This was once a prescribed approach
that was removed from Appendix G's wording in 90.1-2007, but it remains
a viable approach as well.  The potential disadvantage to this approach
is you're changing the individual WWR for each individual space (perhaps
adding windows where there were none) - this may result in less of an
"apples to apples" comparison between the models, which may help/hurt
your relative performance.

 

Cautionary note I throw out to those finding very large WWR's: opaque
spandrel glass constructions are not "vertical fenestrations" per the
definitions in 90.1.

 

Best of luck!

 

~Nick

 

 

 

NICK CATON, E.I.T.

PROJECT ENGINEER

Smith & Boucher Engineers

25501 west valley parkway

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 Syed,
Fareed
Sent: Friday, February 18, 2011 3:11 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] how to model 40% glazing on baseline

 

Hello All,

 

Can anyone please let me know how to model 40% glass on the baseline
design?

 

In my proposed design I used customized glass as there is 100% glass on
north and south.

 

Thanks in advance.

 

 

 

Fareed Syed EIT LEED(r) AP

Analytics Specialist

 

Halcrow Yolles

One South Dearborn

21st Floor

Chicago, IL 60603

 

tel:       +1 312 212 4430

fax:      +1 312 212 4206

www.halcrowyolles.com <http://www.halcrowyolles.com/> 

 

Sustaining and improving the quality of people's lives

 

 

 

 

Visit our website at http://www.halcrow.com <http://www.halcrow.com/> 

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