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/