[Bldg-sim] Easy Question

Hopf, Johannes johannes.hopf at dreso.com
Tue Apr 13 22:45:49 PDT 2010
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Okay know it is clear, 

I think the 2007 way is the more correct one. Why should you make one zone
artificial worse and on better? (If you have different WWR in different
Zones)

 

Johannes

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Von: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] Im Auftrag von Dana Troy
Gesendet: Dienstag, 13. April 2010 21:16
An: bldg-sim at lists.onebuilding.org
Betreff: Re: [Bldg-sim] Easy Question

 

All,

 

As per Addendum A to 90.1-2004, you do NOT need to distribute the baseline
glazing uniformly in horizontal bands across the four orientations. ASHRAE
90.1-2007 is basically 90.1-2004 incorporating the changes made in Addendum
A. All addenda can be found here: http://www.ashrae.org/technology/page/132

 

If you read Table G3.1.5, it only states that the glass must not exceed 40%
and must be distributed by the same proportions as the proposed building.
Therefore, if you have a building with 50% WWR, you just have to reduce each
window by 20%. This will still ensure that you have the same proportions
(e.g. 20% of all of the glass on the north, 30% of all of the glass on the
south, 40% of all of the glass on the east, and 10% of all of the glass on
the west).

 

If your baseline WWR is less than 40%, then leave the window proportions,
shapes, and sizes the same in the baseline and the proposed design.

 

This has all been well documented on the archives as well: 
http://lists.onebuilding.org/htdig.cgi/bldg-sim-onebuilding.org/2007-April/00
4077.html

 

Regards,


Dana Troy
Energy Analyst
LEED® Accredited Professional

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

________________________________

320 SW Washington, Suite 200
Portland, OR 97204-2640
T.  503.227.5280  F. 503.274.7674

Thinking. Inside the building.
www.glumac.com <http://www.glumac.com/>  
 

 

From: Carol Gardner [mailto:cmg750 at gmail.com] 
Sent: Tuesday, April 13, 2010 11:58 AM
To: Rimes, Christie
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Easy Question

 

Perhaps I'm missing something, but didn't he ask us how to calculate the
window to wall ratio? If I'm not missing something, we need to know
specifically, is the wall number wall only or wall + glass. This level of
information is shown on the LV-D report in eQUEST, if he's using eQUEST.
That's why I said, "it depends".

Carol

On Tue, Apr 13, 2010 at 11:45 AM, Rimes, Christie <Christie.Rimes at wspfk.com>
wrote:

For the 90.1-2004 I have always taken it as Luke explained, evenly
distributed the WWR of the entire building.

However for 90.1-2007 I have interpreted the description to mean that the
windows stay in the same location as the proposed building?

 

 

Error! Filename not specified.

 

From: bldg-sim-bounces at lists.onebuilding.org [mailto:
bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Vikram Sami
Sent: Tuesday, April 13, 2010 11:38 AM
To: JohannesHopf; bldg-sim at lists.onebuilding.org; LukeWilson


Subject: Re: [Bldg-sim] Easy Question

 

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
<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim-bounces@lists.onebuild
ing.org>  [mailto:bldg-sim-bounces at lists.onebuilding.org
<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim-bounces@lists.onebuild
ing.org> ] On Behalf Of Hopf, Johannes
	Sent: Tuesday, April 13, 2010 12:55 PM
	To: bldg-sim at lists.onebuilding.org
<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim@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
<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim-bounces@lists.onebuild
ing.org> 
	[mailto:bldg-sim-bounces at lists.onebuilding.org
<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim-bounces@lists.onebuild
ing.org> ] Im Auftrag von Wilson, Luke
	Gesendet: Dienstag, 13. April 2010 17:18
	An: Eurek, John S NWO; bldg-sim at lists.onebuilding.org
<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim@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
<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim-bounces@lists.onebuild
ing.org> 
	[mailto:bldg-sim-bounces at lists.onebuilding.org
<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim-bounces@lists.onebuild
ing.org> ] On Behalf Of Eurek, John S
	NWO
	Sent: Tuesday, April 13, 2010 10:22 AM
	To: bldg-sim at lists.onebuilding.org
<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim@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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