[Bldg-sim] Apendix G3.1.2.9

Wed Mar 24 13:19:06 PDT 2010

Fareed,

Set your supply air to room temp delta t equivalent to 20F.  Run the sim, if I am not mistaken this should generate usable airflow quantities to be used in point 9.  Make sure you have oversizing in place before any of this.  I have not been told this but I think G is set up to be done step by step from the beginning.  In some instances you need to update your model in order to proceed with the next step.  Good luck.

Kevin

________________________________
From: Fareed Syed [mailto:syedf at progressiveae.com]
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
[cid:image002.jpg at 01CACB6D.54C48700]
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<mailto: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
[cid:image002.jpg at 01CACB6D.54C48700]
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<mailto:syedf at progressiveae.com>
www.progressiveae.com<http://www.progressiveae.com/>

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