Cold Aisle Containment Overview - Polargy Jun 14v5

8/14/2019 Cold Aisle Containment Overview - Polargy Jun 14v5

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Cold Aisle ContainmentAn overview of cold and hot aisle containment


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Containment is about isolating hot air from cold air

Containment sealsabove and around racksand prevents mixing

No sealing above andaround racks allows mixingand lets cold air escapewithout doing any work


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Air mixing and air escaping is costlyTypically, a chiller will

operate 1% more

efficiently for every 1Fincrease in the chilled

water supply temperature

14F to 20F temp differentialin chill water increases piping

capacity by 43%

Change from 19 to 32 Delta-T improves CRAH

capacity 49%

Set points kept lowto assure cold air at

top of racks

Hot spots causefailures and shorten

equipment life


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Containment OptionsDepend on ceiling type and fire safety constraints

WallsCurtains hang from dropceilingOK for ceilings 12 orunder

Stovepipe/Open TopCurtains or Panels gopartially up to ceilingCeiling is over 15 butcapping is too difficult ornot allowed

CapPanels rest on racks orhang from cablesCeiling open grid or tootall for curtains


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After Cold Aisle or Hot Aisle ContainmentSavings and benefits

CapacityCan add more serversDefer capital expenditures

Reliability

More uniform inlet temperaturesReduced heat related failures

Immediate Energy SavingsEnergy savings from increased CRAH efficiencyLower demand on chilled water plant

Next Step Energy SavingsRaise set points (can do this now that inlet

temperatures are more uniform)Turn off CRAH unitsRaise chilled water temperatureIncrease number of hours of economizer usage (again,with more uniform inlet temperatures, cab bring inwarmer air)


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Cap Design Sample

Uniformracks

Panels heldby racks

Strip curtaindoors

connecteddirectly to

racks

Cold Aisle Containment, Panels, Open Grid Ceiling


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Stovepipe/Open Top Design Sample

Uniformracks,

containmentconnecteddirectly to

racks

Overheadcooling ducts

drop intostovepipe

containment

Slab floor

Cold Aisle Containment, Panels, Open Grid Ceiling, Slab Floor


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Wall Design SampleCurtains Hung from Drop T-Bar Ceiling

Single sidedcold aisle

Curtainsconnect todrop ceiling


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Fuse Links - CurtainsFire Safety Containments Biggest Issue

Hanging curtains could obstruct sprinkler coverage zonesIt is costly to move and add sprinkler heads, especially in a dry type systemFuse links let curtains drop prior to sprinkler head activation, avoiding the need to move oradd sprinkler headsBUT, not every fire marshal or insurance company is signed on for this approachSO, check first.PLUS, the are other containment solutions that meet more stringent requirements.


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BASELINE TUNECONTAIN

Barriers above racks

Doors on aisle ends Blanking panels

Filling floor gaps

Rack Temperatures

Delta-Ts

CRAH on/off

Change set points

Typical Cold Aisle or Hot Aisle Containment ProjectEach project has these three key steps


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Site:2000 square foot, high density site

Problem:High energy bills, hot air recirculation under racks.

Containment:Cold aisle containment with panels and strip curtains onaisle ends. Contained two cold aisle. Blanking panels

and Air Dam Foam under racks.

Cooling:Available cooling: 200 tonsAverage cooling load: 150 tonsAverage IT load: 350 kWCooling required for 330kW: 103 tonsExcess cooling: 47 tons

Savings:CRAC reduction1 CRAC turned off, 2 put in standby

Annual Savings: $30,000 validated by PG&EInvestment: $30,000Rebate: $15,000 rebate from PG&E

Payback Period: 6.0 months

Polargy Containment Case Study


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Energy savings from increased CRAHefficiency

Lower demand on chilled water plant

saves energy

Reduced heat related failures

Power utility rebates

More data center capacity

Compelling ROIContainment ROIs Are Compelling


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Polargy, Inc.

256 Gibraltar Drive, Suite 155Sunnyvale, CA 94089

888.816.8338

www.polargy.com
http://www.polargy.com/http://www.polargy.com/

Documents

Cold Aisle Containment Overview - Polargy Jun 14v5