[Equest-users] Data Center Modelling and Ice Storage

Will Mak wmak at epsteinglobal.com
Fri Jun 17 07:15:17 PDT 2011


Side note that you may want to keep in mind that’s been brought up here is how you model the data center process loads. If the loads are too large, you may have a difficult time meeting the prerequisite. 

 

William Mak, LEED AP BD+C
Mechanical Design Engineer

EPSTEIN
Architecture
Interiors
Engineering
Construction

Sustainability

600 West Fulton Street
Chicago, Illinois 60661-1259

D: (312) 429-8116
F: (312) 429-8800

E: wmak at epsteinglobal.com
W: www.epsteinglobal.com <http://www.epsteinglobal.com/> 

þ Epstein is a firm believer in sustainability. We ask that you please consider the environment before printing this e-mail.

 

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Patrick Keeney
Sent: Friday, June 17, 2011 9:06 AM
To: Shuichi Hendrickson
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Data Center Modelling and Ice Storage

 

Hi Shuichi,

 

Below is a link to an additional source from a previous post that helps explain how to model UFAD and/or displacement ventilation.  Their method is very similar to yours, in that you split the equipment loads between the plenum and the space.  In particular, there is a section which explains pretty clearly how to model UFAD in eQUEST.  This may be repeat info to you, but it may be able to help.  

 

http://www.archenergy.com/ieq-k12/Public/Proj2_Deliverables/D2.9c_FinalDVDesignGuide_2006-0630.pdf

 

 

Best, Patrick



 

On Fri, Jun 17, 2011 at 3:07 AM, Shuichi Hendrickson <Shuichi.Hendrickson at erm.com> wrote:

Hello all,

 

 

I am attempting to model a data center in eQuest for LEED. This will be a first attempt at modelling a data center for me and I am in hopes someone could provide some sage advice on the subject. 

 

 

My understanding is that the data center will be a standard hot/cold aisle configuration with underfloor cooling (UFAD). The CRACs are on CHW and the CHW plant consists of multiple chillers, as well as, dedicated chillers for ice storage.

 

Recognizing that eQuest doesn’t consider fluid air dynamics or temperature stratification resultant from UFAD, I am considering using the UFAD modelling guidance in the EDR Design Guidelines: HVAC Simulation Guidance (http://www.energydesignresources.com/resources/publications/design-guidelines/design-guidelines-hvac-simulation-guidelines.aspx)

 

This document addresses UFAD, but not specific to data center or hot/cold aisle. What Ive gotten out of the guidance is that for comfort UFAD applications, the upper portion of a room (non occupied ) space is defined as plenum and the internal loadings for the room are apportioned between the occupied zone and plenum. It seems to me that this method could be appropriate for hot/cold aisle scenarios as well, with the hot aisle as the plenum and cold as space. From the guidance equipments loads are suggested to be apportioned 67% space 33% plenum for comfort applications. 

 

My understanding of hot/cold aisle configurations is that cold air is supplied on the front side of the server racks, pulled through the racks by the server internal cooling fans, and exhausted in to the hot aisle. Following from this logic it seems to me that the equip load should apportioned mostly to the plenum (hot aisle). 

 

Does anyone have a better suggestion for load proportioning for a datacenter?  Am I over complicating this?

 

My next challenge is modelling the Ice storage. I have 6 chillers of which 2 are dual mode CHW and Ice making. My guess is that I will have to model the dual mode units as 4 chillers (2 for CHW and 2 for ice) because of the different efficiencies and supply temps, while somehow using to the equip controls to make sure the chillers are not operating simultaneously. 

 

This will be another first attempt for me. If anyone knows of any useful modelling guidance docs or has any advice on this it would be highly appreciated.

 

 

Thank you in advance and regards,

 

 

 

Shuichi Hendrickson

Environmental Engineer, LEED AP


ERM Japan

The Landmark Tower 

Yokohama 19F

2-2-1-1, Minatomirai, Nishi-ku

Yokohama, 220-8119, Japan


T:+81(0)45-640-3780 <tel:%2B81%280%2945-640-3780>  
F:+81(0)45-640-3781 <tel:%2B81%280%2945-640-3781> 
shuichi.hendrickson at erm.com <mailto:shuichi.hendrickson at erm.com>  
www.erm.com <http://www.erm.com/>  

Ranked No1 All-Environmental Firm: ENR Magazine (2004, 2005, 2006, 2007)
Environmental Adviser of the Year: Acquisitions Monthly (2005, 2006, 2008)

P Please consider the environment before printing this email

 

 

________________________________


This electronic mail message may contain information which is (a) LEGALLY PRIVILEGED, PROPRIETARY IN NATURE, OR OTHERWISE PROTECTED BY LAW FROM DISCLOSURE, and (b) intended only for the use of the Addressee (s) names herein. If you are not the Addressee (s), or the person responsible for delivering this to the Addressee (s), you are hereby notified that reading, copying, or distributing this message is prohibited. If you have received this electronic mail message in error, please contact us immediately and take the steps necessary to delete the message completely from your computer system. Thank you.

Please visit ERM's web site: http://www.erm.com <http://www.erm.com/> 


_______________________________________________
Equest-users mailing list
http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
To unsubscribe from this mailing list send  a blank message to EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG




-- 
Patrick J Keeney
MArch-MSSD Candidate
410-299-5627

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20110617/8132b666/attachment.htm>


More information about the Equest-users mailing list