RE: [EnergyPlus_Support] Re: ASHRAE Pump modeling approach

[Ivan Mezzacapa <ivan_slip@xxxxxxxxxxx>]

Great question, Fabiano.
I'm thinking about this too, on last week!
Regards
Técg. Ivan Mezzacapa

Projetista  de Ar Condicionado / Consultor em Eficiência Energética



LinkedIN: <http://www.linkedin.com/in/ivanmezzacapa>http://www.linkedin.com/in/ivanmezzacapa
Facebook: http://www.facebook.com/ivan.mezzacapa
Celular: (11)9963-9326



To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx
Date: Mon, 5 May 2014 14:41:02 -0500
Subject: RE: [EnergyPlus_Support] Re: ASHRAE Pump modeling approach


Dear Fabiano,

If your proposed system does not have a chilled water plant, it may not matter how you define the Baseline ? but I am unsure if you mean that there is no cooling in the Proposed system or something else.



I think ?evenly distributed? means 50% of power to both primary and secondary pumps. This seems appropriate only in the absence of good information about the piping systems.  Most primary / secondary systems have equal flow and roughly equal pump efficiency, but very unequal pressure drops.  As a result, the secondary pump normally has a larger motor.  That is probably why the ruling says that power ?may be distributed between the Baseline primary and secondary pumps consistent with the proposed design? (e.g., proportional to actual pressure drops)



James V Dirkes II, PE, BEMP, LEED AP
<http://www.buildingperformanceteam.com/>www.buildingperformanceteam.com
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653



From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of fabianoferreira27@xxxxxxxxxxx
Sent: Monday, May 05, 2014 2:36 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: ASHRAE Pump modeling approach





Hello everyone, 



I've got recently a review comment about the same topic. I've read the LEED Interpretation 10299, which says: 



"For projects registered after the date of this LEED Interpretation, the total Baseline chilled water system pump power shall be 22 W/gpm per ASHRAE 90.1-2007 Section G3.1.3.10; and the Baseline pump power shall be evenly distributed between the Baseline primary and secondary chilled water pumps. Alternatively, if the proposed case has primary/secondary chilled water pumps, the Baseline pump power may be distributed between the Baseline primary and secondary pumps consistent with the proposed design".



Could anyone explain what does it means when it says that the pump power shall be evenly distributed between the Baseline primary and secondary chilled water pumps?  I mean, if the proposed does not have chilled water plant, how should I distribute the pump power?







Regards,



Fabiano Ferreira














__._,_.___

Primary EnergyPlus support is found at:
<http://energyplus.helpserve.com>http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:
<http://www.energyplus.gov>http://www.energyplus.gov

The group web site is:
<http://groups.yahoo.com/group/EnergyPlus_Support/>http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.


<http://geo.yahoo.com/serv?s=97476590/grpId=3387488/grpspId=1705007389/msgId=31879/stime=1399321186>

<https://groups.yahoo.com/neo/groups/EnergyPlus_Support/info;_ylc=X3oDMTJlaGE3dGtqBF9TAzk3MzU5NzE0BGdycElkAzMzODc0ODgEZ3Jwc3BJZAMxNzA1MDA3Mzg5BHNlYwN2dGwEc2xrA3ZnaHAEc3RpbWUDMTM5OTMyMTE4Ng-->Visit Your Group
* <https://groups.yahoo.com/neo/groups/EnergyPlus_Support/members/all;_ylc=X3oDMTJmbGNpczM1BF9TAzk3MzU5NzE0BGdycElkAzMzODc0ODgEZ3Jwc3BJZAMxNzA1MDA3Mzg5BHNlYwN2dGwEc2xrA3ZtYnJzBHN0aW1lAzEzOTkzMjExODY->New Members 14
<https://groups.yahoo.com/neo;_ylc=X3oDMTJkNzVhOWViBF9TAzk3NDc2NTkwBGdycElkAzMzODc0ODgEZ3Jwc3BJZAMxNzA1MDA3Mzg5BHNlYwNmdHIEc2xrA2dmcARzdGltZQMxMzk5MzIxMTg2><http://l.yimg.com/ru/static/images/yg/img/email/new_logo/logo-groups-137x15.png>
? <https://info.yahoo.com/privacy/us/yahoo/groups/details.html>Privacy ? <mailto:EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx?subject=Unsubscribe>Unsubscribe ? <https://info.yahoo.com/legal/us/yahoo/utos/terms/>Terms of Use
__,_._,___