[Bldg-sim] Modelling 90.1 Baseline Envelope for Existing + Additions

[Nick Caton]

Proposed and Baseline areas/layouts matching works perfectly until you exceed either 40% for vertical or 5% for skylights.  See Table G3.1.5, baseline items c. and d.  This might be coincidence, but just to be cover all bases: 28% + 12% = 40% is an incorrect reading - the skylight and vertical fenestration thresholds are independent.

I think you are to leave the vertical fenestrations alone (being under the 40% threshold) and you need to proportionally lower the area of the skylights in the baseline model to get back to 5%.  Proposed model needs to match actual design so it's skylights remain the same.

I'm not certain how or if the project being a major renovation has any bearing on the matter.

Are you making the case that the existing skylights are envelope components not being touched, and so should remain equal in area between the models despite exceeding the 5% threshold?  Do you have additional new skylights complicating the matter?

~Nick

[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: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Santiago Velez
Sent: Monday, November 04, 2013 3:20 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Modelling 90.1 Baseline Envelope for Existing + Additions

Dear forum users, I have modelled a project following Appendix G. and have received a review regarding my interpretation of % glazed area on the baseline.

The project is a mayor renovations + Additions (existing conditioned warehouse + New office building attached). There were no modification on % area of vertical and horizontal glazing on the existing bit of the building.

My approach was to model existing envelope, shape and fenestration, exactly the same in both proposed and baseline. The addition was modelled following the "maximum 40% for vertical fenestration and 5% for skylight" rule. The result of the whole building for baseline is, 28% vertically glazed and 12% of skylights (the existing bit was very different than 40%, and 5% respectively)
The reviewer states that the end result for the baseline should still be 40% and 5%. It is not very clear to me how would I get there.. Do I have to make the existing fenestration proportionally smaller, just like I would do for the baseline of a completely new building?

Thanks in advance.

Santiago.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20131104/4cce0199/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 1459 bytes
Desc: image001.jpg
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20131104/4cce0199/attachment-0002.jpg>