[Bldg-sim] Apendix G3.1.2.9

Wed Mar 24 13:18:27 PDT 2010

To calculate total bhp, you would use the cfm across each fan and calculate
using the pressure increases across each fan and the efficiency's of each fan
(along with a constant).....then add them all up.  I don't know if this has
anything to do with G3.1.2.9.  Depending on whether your in IP or SI units,
you will come up with hp or kW.  If it was up to me, I would use (bhp or
kW)/(supply cfm) to do an energy analysis.  But, I'm not gbci.

  _____  

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Fareed Syed
Sent: Wednesday, March 24, 2010 9:29 AM
To: Gregg Liddick; Kimberly at NorthernArchitects.com;
bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Apendix G3.1.2.9

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/> 

NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer.
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