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

W. Peter Anderson panderson at jpengineer.com
Thu Mar 25 04:51:29 PDT 2010


Re: [Bldg-sim] Apendix G3.1.2.9Excellent, thanks.  Never would have thought of that.

Regards,
Peter
  ----- Original Message ----- 
  From: Andrew Craig 
  To: W. Peter Anderson ; Kevin Kyte ; Fareed Syed ; Gregg Liddick ; Kimberly at NorthernArchitects.com ; bldg-sim at lists.onebuilding.org 
  Sent: Wednesday, March 24, 2010 7:42 PM
  Subject: RE: [Bldg-sim] Apendix G3.1.2.9- More questions


  Peter---

   

  Are you using eQUEST for modeling?   If so, you can right click in the "Static in WG" box and hit "Restore Default".  This will enable the "Design kW/CFM" input field.

   

  Andrew Craig EIT, LEED AP
  Mechanical Designer / Energy Analyst

  INTERFACE ENGINEERING
  email andrewc at interfaceeng.com
  direct 503.382.2696




   

  From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of W. Peter Anderson
  Sent: Wednesday, March 24, 2010 2:45 PM
  To: Kevin Kyte; Fareed Syed; Gregg Liddick; Kimberly at NorthernArchitects.com; bldg-sim at lists.onebuilding.org
  Subject: Re: [Bldg-sim] Apendix G3.1.2.9- More questions

   

  I 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


----------------------------------------------------------------------------

    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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