[Bldg-sim] Minimum Ventilation Air in Proposed and Baseline - Breathing Zone or Outdoor Air Intake

[Aaron Smith]

Scott,

 

Thanks, I see that came out in 2010 so it didn't make it into 90.1-2010.  

 

It allows you to claim credit for having zone effectiveness greater than 1.0
but doesn't allow you to claim system efficiency gains.

 

"Baseline  ventilation  airflow  rates  in  those

zones shall be calculated using the proposed design Ven-

tilation Rate  Procedure  calculation  with  the  following

change only.  Zone air distribution effectiveness shall be

changed to (Ez)=1.0 in each zone having a zone air distri-

bution effectiveness (Ez)>1.0."  

 

So if your Proposed has a DOAS and the Baseline is VAV, the baseline won't
meet Standard 62.

 

Aaron

 

Aaron Smith, P.Eng 

M&R Engineering 

  _____  

From: West, Scott P [mailto:Scott.West at jacobs.com] 
Sent: Friday, December 13, 2013 5:42 PM
To: 'Aaron Smith'; 'bldg-sim at lists.onebuilding.org'
Subject: RE: [Bldg-sim] Minimum Ventilation Air in Proposed and Baseline -
Breathing Zone or Outdoor Air Intake

 

Aaron,

ASHRAE 90.1-2007 Addendum bj allows modelers to take energy savings credit
for HVAC systems that increase air distribution effectiveness and use demand
control ventilation.  This can therefore result in different ventilation
rates between Baseline and Proposed models.  USGBC allows modelers to apply
any ASHRAE Addenda they want for that version of the standard as long as it
is applied uniformly and clearly stated.  

 

Scott P. West, P.E., LEED AP BD+C, BEAP, BEMP | JACOBS | Mechanical Engineer
| Energy & Power Solutions | 817.222.8512 office | 817.897.1882 cell |
scott.west at jacobs.com <mailto:rick.zilar at jacobs.com>  | www.jacobs.com
<http://www.jacobs.com/>  |  <http://www.jacobs.com/energyportfolio>
www.jacobs.com/energyportfolio 

 

From: Aaron Smith [mailto:asmith at mreng.ca] 
Sent: Friday, December 13, 2013 2:08 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Minimum Ventilation Air in Proposed and Baseline -
Breathing Zone or Outdoor Air Intake

 

Hi,

 

We've received a nice boost in some models in Canada lately as the Proposed
and Baseline designs only need to have the same amount of outdoor air in the
breathing zone under CaGBC Rules.  Meaning that if your baseline design is
VAV Reheat and your proposed design is chilled beam and baseboard heating
then your proposed design will have to condition somewhere in the range of
40% less outdoor air due to higher zone effectiveness and system efficiency.
It makes a lot of sense to me and becomes a significant energy savings
measure.  

 

Is this allowed by the USGBC or by ASHRAE?  I just read in 90.1 in G.3.1.2.5
that "Minimum outdoor air ventilation rates shall be the same for the
proposed and baseline designs."  That doesn't specify whether they mean in
the breathing zone or outdoor air intake but I think most assume it to be
the outdoor air intake.

 

Aaron

 


 

Aaron Smith, P.Eng 

LEEDR AP BD+C, M-ASHRAE, BEMP, Mechanical Engineer

 


    



 


 

     t: (902) 422-7393

     f: (902) 423-4945

     e:  <mailto:asmith at mreng.ca> asmith at mreng.ca 

 

 


 

 

 

 

 

 


The electronic message contained herein is private and confidential,
intended only for the recipient(s) specified. If you have received this
message in error, please delete it and notify us immediately.  Any
accompanying files are supplied as a matter of courtesy only.  The data are
without warranty of any kind.  Any person or business making use of the data
is responsible for confirming its accuracy and completeness.  M&R
Engineering Ltd. is not responsible for edited or produced versions of this
digital information. 

 

 

 

  _____  

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.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20131216/3ff0983f/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 2165 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20131216/3ff0983f/attachment-0006.jpeg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 77404 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20131216/3ff0983f/attachment-0007.jpeg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 1849 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20131216/3ff0983f/attachment-0008.jpeg>