[Bldg-sim] Apendix G3.1.2.9- More questions

Wed Mar 24 14:44:39 PDT 2010

Re: [Bldg-sim] Apendix G3.1.2.9I am working on a model doing the exact same thing for LEEDS baseline.  I have calculated my Pfan but cant seem to input it or get the correct outputs.  

The model wont allow me to enter anything in the kW/cfm screen. My equipment is a PSZ

Should I adjust the Static Pressures and efficiencies to get the same value?

Regards,
W. Peter Anderson, P.E
JP Engineering
41 Mechanic Street
Windsor, CT 06095
Ph: 860/688-5223
Fax: 860/688-5269
  ----- Original Message ----- 
  From: Kevin Kyte 
  To: Fareed Syed ; Gregg Liddick ; Kimberly at NorthernArchitects.com ; bldg-sim at lists.onebuilding.org 
  Sent: Wednesday, March 24, 2010 4:19 PM
  Subject: Re: [Bldg-sim] Apendix G3.1.2.9

  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

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  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® 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

  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® AP

  The Epsten Group, Inc.

  429 Edgewood Avenue

  Atlanta GA 30312

  Phone: 404-577-0370  ext. 102

  Fax: 404-577-1739

  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: 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

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  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® AP 

  The Epsten Group, Inc. 

  429 Edgewood Avenue 

  Atlanta GA 30312 

  Phone: 404-577-0370  ext. 102 

  Fax: 404-577-1739 

  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® 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

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