[Bldg-sim] Apendix G3.1.2.9

Wed Mar 24 06:29:01 PDT 2010

Hi Greg,

My basic question is which cfm do I take to calculate Pfan? Just the
supply to come up with kW/cfm or sum of supply, return, relief, and
exhaust fans?

Thanks,

Fareed Syed EIT, LEED(r) AP

Mechanical Engineer 

1811 4 Mile Rd NE
Grand Rapids, MI  49525

Phone: 616.361.2664 ext. 3247
Direct: 616.447.3447
Fax: 616.361.1493 

syedf at progressiveae.com
www.progressiveae.com <http://www.progressiveae.com/> 

From: Gregg Liddick [mailto:gliddick at theepstengroup.com] 
Sent: Wednesday, March 24, 2010 9:18 AM
To: Kimberly at NorthernArchitects.com; Fareed Syed;
bldg-sim at lists.onebuilding.org
Subject: RE: [Bldg-sim] Apendix G3.1.2.9

Hi Kim,

I'm fairly certain that there's no specific guidance in Appendix G.
What most people do is break it up so that it's proportional to the
proposed case.  For example if the baseline fan power is 34.5 kW and the
actual parameters call for 20 kW supply and 10 kW return you would break
the baseline case up into 23 kW supply and 11.5 kW return.  I hope that
helps.

Gregg Liddick, EIT, LEED(r) AP

The Epsten Group, Inc.

429 Edgewood Avenue

Atlanta GA 30312

Phone: 404-577-0370  ext. 102

Fax: 404-577-1739

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

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From: Kimberly Killian [mailto:Kimberly at NorthernArchitects.com] 
Sent: Wednesday, March 24, 2010 7:36 AM
To: Gregg Liddick; syedf at progressiveae.com;
bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Apendix G3.1.2.9

Gregg,

Is there guidance on what portion of the Pfan goes to each? What
percentage goes to supply, what percentage to return, etc?

Kimberly Killian
Northern Architects, Inc.
207 King Street Suite 3
Burlington VT 05401
T: 802-658-1953
F: 802-658-2975

________________________________

Original message
From: "Gregg Liddick"  
To: syedf at progressiveae.com; bldg-sim at lists.onebuilding.org
Received: 3/23/2010 5:24:39 PM
Subject: Re: [Bldg-sim] Apendix G3.1.2.9

No, you use only the fan supply cfm to calculate the total fan power,
then cut that fan power up into supply, return, etc.

Best Regards,

Gregg Liddick, EIT, LEED(r) AP 

The Epsten Group, Inc. 

429 Edgewood Avenue 

Atlanta GA 30312 

Phone: 404-577-0370  ext. 102 

Fax: 404-577-1739 

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

Please consider the environment before printing this e-mail. 

This transmission is intended exclusively for the individual or entity
to which it is addressed. This communication may contain information
that is confidential, proprietary, privileged or otherwise exempt from
disclosure. If you are not the named addressee, you are NOT authorized
to read, print, retain, copy or disseminate this communication, its
attachments or any part of them. If you have received this communication
in error, please notify the sender immediately and delete this
communication from all computers. This communication does not form any
contractual obligation on behalf of the sender, the sender's employer,
or the employer's parent company, affiliates or subsidiaries. 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Fareed Syed
Sent: Tuesday, March 23, 2010 5:11 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Apendix G3.1.2.9

Hello All,

I am trying to understand the stated appendix for the baseline model. 

When I am calculating the Pfan for a system, do I need add up supply,
return, system and room exhaust cfm's? 

I got this comment from GBCI: "Revise the sum of the supply, return,
exhaust, and relief fans for each HVAC system to be equal to the volume
calculated in G3.1.2.8 and power calculated in G3.1.2.9 (where CFM
refers to supply air volume)." 

Please let me know your input on how to calculate Pfan.

Thanks,

Fareed Syed EIT, LEED(r) AP

Mechanical Engineer 

1811 4 Mile Rd NE
Grand Rapids, MI  49525

Phone: 616.361.2664 ext. 3247
Direct: 616.447.3447
Fax: 616.361.1493 

syedf at progressiveae.com
www.progressiveae.com <http://www.progressiveae.com/> 

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