[Bldg-sim] Easy Question

Vikram Sami vssami at yahoo.com
Tue Apr 13 11:38:15 PDT 2010


Interesting point. I've never noticed this before, but this is different from 2004. 
 
2004 stated :
 
Vertical fenestration areas for new buildings and additions shall equal that in the proposed design or 40% of gross abovegrade wall area, whichever is smaller, and shall be distributed uniformly in horizontal bands across the four orientations.
 
It looks like they have changed it (shall be distributed on each face of the building in the same proportions in the proposed design) to be more representative of the actualy building. I think 2007 is asking you to distibute it by orientation (if you have 40% on the west, 25% south, 20%north and 25% east in your design, you will have 40% on the west, 25% south, 20%north and 25% east in your baseline). This makes sense because otherwise we were doing the striping as well as the 4 rotations which was a little redndant. 
 
(Not so easy question after all, but a good one). 
 

--- On Tue, 4/13/10, Wilson, Luke <LWilson at integral-group.net> wrote:


From: Wilson, Luke <LWilson at integral-group.net>
Subject: Re: [Bldg-sim] Easy Question
To: "Hopf, Johannes" <johannes.hopf at dreso.com>, "bldg-sim at lists.onebuilding.org" <bldg-sim at lists.onebuilding.org>
Date: Tuesday, April 13, 2010, 10:05 AM


ASHRAE 90.1-2007 Table G3.1 reads:
"Vertical fenestration areas for new buildings and additions shall equal that in the proposed design or 40% of gross above-grade wall area, whichever is smaller, and shall be distributed on each face of the building in the same proportions in the proposed design."

I wasn't aware that this requirement had changed in the 2007 version (thanks Cam!).

Luke

-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Hopf, Johannes
Sent: Tuesday, April 13, 2010 12:55 PM
To: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Easy Question

I can't find this section in Table 1.3.? I just find the 40% limitation for
the baseline building. Can you post an excerpt?


Best regards

 
Johannes 

-----Ursprüngliche Nachricht-----
Von: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] Im Auftrag von Wilson, Luke
Gesendet: Dienstag, 13. April 2010 17:18
An: Eurek, John S NWO; bldg-sim at lists.onebuilding.org
Betreff: Re: [Bldg-sim] Easy Question

John,

I'm assuming you are using ASHRAE 90.1-2007 Appendix G for your Baseline?
If so, the way I read it from Table G3.1 is that you should evenly distribute
the WWR of the entire building, not for each floor. Therefore I would use
11.4% for each floor.

Luke

-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Eurek, John S
NWO
Sent: Tuesday, April 13, 2010 10:22 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Easy Question

I have a two story building.  For the baseline I am evenly distributing the
fenestration.

The first floor window area is 462.2 ft^2
The second floor window area is 647.1 ft^2

The first floor wall area is 4858 ft^2
The second floor wall area is 4858 ft^2

In the base line model do I use:

First floor 9.5%
Second floor 13.3%

OR

First floor 11.4%
Second floor 11.4%
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