[Equest-users] Data Center Modelling and Ice Storage

[Patrick Keeney]

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
> F:+81(0)45-640-3781
> shuichi.hendrickson at erm.com
> www.erm.com
>
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-- 
Patrick J Keeney
MArch-MSSD Candidate
410-299-5627
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