[Bldg-sim] Appendix G - Fan power

Hopf, Johannes johannes.hopf at dreso.com
Wed Mar 9 10:40:12 PST 2011


Thanks Vikram for your help.

I´m gonna search the archive and post were the answer can be found.

 

Johannes

 

 

Von: Sami, Vikram [mailto:Vikram.Sami at perkinswill.com] 
Gesendet: Dienstag, 8. März 2011 19:41
An: Hopf, Johannes
Betreff: RE: [Bldg-sim] Appendix G - Fan power

 

In that case – for the baseline the Fan power limitation – is for the ENTIRE
building – supply and return. You calculate your total allowable and then
break it down based on the ratio in your designed building. Sop for example
if your designed building has a supply to return fan energy ratio of 3:1, you
would first calculate your total allowable fan energy, and then separate it
by supply and return in the ratio of 4:1.

 

There’s been some extensive discussion on this topic in the past on this list
– you could probably find it in the archives somewhere. 

 

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Vikram Sami, LEED AP BD+C

Sustainable Design Analyst

1315 Peachtree St. NE, Atlanta, GA 30309

t: 404-443-7462    f: 404.892.5823       e: vikram.sami at perkinswill.com   
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Von: Andrew Craig [mailto:AndrewC at InterfaceEng.Com] 
Gesendet: Dienstag, 8. März 2011 19:49
An: Hopf, Johannes; bldg-sim at lists.onebuilding.org
Betreff: RE: [Bldg-sim] Appendix G - Fan power

 

This is a good question and isn’t specifically addressed in Appendix G 2007.
It does specify to match the proposed design’s fan arrangement so this can be
used as a starting point.  On a recent job we did with return fans, the
overall fan power was split 70/30 between supply and return.  Another job
that used power exhaust fans split out to 80/20.  As Michael mentioned,
Appendix G 2010 says that they should be proportioned out the same as the
proposed design although that information often needs to be extracted from
the design team.

 

Andrew Craig PE, LEED AP
Project Mechanical Engineer

INTERFACE ENGINEERING
email andrewc at interfaceeng.com <mailto:andrewc at interfaceeng.com> 
direct 503.382.2696

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



 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Hopf, Johannes
Sent: Tuesday, March 08, 2011 10:36 AM
To: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Appendix G - Fan power

 

From time to time we´re asked in LEED-Clarifications to break up the total
fan-power into relief, exhaust, supply etc. Can somebody tell us what to do?

The calculation in the proposed is totally different and for the baseline we
only use the 90.1 equations.

 

 

Johannes

 

Von: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] Im Auftrag von Sami, Vikram
Gesendet: Dienstag, 8. März 2011 17:11
An: bldg-sim at lists.onebuilding.org
Betreff: [Bldg-sim] Appendix G - Fan power

 

Does the dot in the equation indicate multiplication? So should the equation
read CFMS X 0.0013 + A?

 

The reason I am confused is that they use X in other places. 

 

 

Thanks in advance

We've moved!  Please note our new address. 

Vikram Sami, LEED AP BD+C

Sustainable Design Analyst

1315 Peachtree St. NE, Atlanta, GA 30309

t: 404-443-7462    f: 404.892.5823       e: vikram.sami at perkinswill.com   
www.perkinswill.com <http://www.perkinswill.com/> 

Perkins+Will.  Ideas + buildings that honor the broader goals of society

 

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