Wade LewisVP Cloud Services

Data Center Design through Hot-Aisle Data Center Design through Hot-Aisle Containment and Outside Air Containment and Outside Air

EconomizersEconomizers

Traditional State of the Data Traditional State of the Data CenterCenter

Sources: •McKinsey & Company/Uptime Institute Report•Electronics Cooling Magazine (May2007)•EPA 2007 Report to Congress

Energy Costs increasing 11% YOY globally Data Center energy consumption increasing by 12%

annually Data Centers consume .5% of all power produced

worldwide. Data Center Greenhouse Gases are predicted to

quadruple by 2020, and be nearly equal to steel plants in emissions.

Facility Costs Growing at 20% compared to 6% for I.T.

Cooling consumes up to 55% of all data center energy

Up to 40% of cooled air never reaches critical equipment

By preventing mixing of cooled air with exhaust air, cooling efficiency can be increased by as much as 30%

Sources: •McKinsey & Company/Uptime Institute Report•Electronics Cooling Magazine (May2007)•EPA 2007 Report to Congress

Traditional State of the Data Traditional State of the Data CenterCenter

Cost comparison: Server vs. Power & Cooling(in Bill. US-Dollar)*

0

10

20

30

40

50

60

70

80

2001 2002 2003 2004 2005 2006 2007 2008 2009* Quelle: IDC/WiWo Nr. 28 vom 09.07.2007

Power / Cooling

Server

State of the Data State of the Data CenterCenter

Hot Aisle / Cold Aisle Hot Aisle / Cold Aisle LayoutsLayouts

Data Center design standards recommend configuring cabinet rows in alternating hot and cold aisles

Air flow dynamics in the Data Center often results in recirculation of hot air into the cold aisle

Mixing of exhaust air with cooled air raises temperature as much as 15°F before it reaches servers, requiring set points far below ASHRAE TC9.9 recommendations

Mixing also results in return air temperatures that are well below the temperature of the server exhaust, known as short cycling.

Minimizing air mixing Maximizes CRAC unit efficiencyMaximizes CRAC unit efficiency Increases cooling capacity of existing Increases cooling capacity of existing

infrastructureinfrastructure

Hot Aisle/Cold Aisle Air Hot Aisle/Cold Aisle Air MixingMixing

Raised Floor System Forced Air Plenum CRAC units (Chilled Water Loop) Hot Aisle / Cold Aisle intermixed Power Distribution in Conditioned Space Standard 120v Single Phase Power

Very inefficient design – Hot air mix from server racks and CRAC unitsHeat load from PDUOver sized (HP) blower motors (CRAC)Server load inefficient using 120v power

Traditional Data Center Traditional Data Center DesignDesign

No Containment

32 racks @ 10kW ea - 320kW total heat 3 CRACS-26 Ton ea

- 250kW capacity- Only 78% of the

“required” cooling capacity

Illustration Temp Range =

60°F to 157°F

CFD AnalysisCFD Analysis

Hot Aisle Containment Airflow

The Air flow dynamics in this model prevent the recirculation of hot air into the cold aisle.

Slab Floor Air Curtain System 100% Outside Air Economizers Hot Aisle Containment with Rejection Fan Power Distribution in Contained Space (Hot Aisle) Blanking Panels Standard 208v 3 Phase power

Very efficient design – Hot air contained and rejectedHeat load from PDU contained in Hot AisleServer load more efficient using 208v power

Higher Density Data Center Higher Density Data Center DesignDesign

Hot Aisle Containment OverviewHot Aisle Containment Overview

Energy Savings Aisle containment can provide energy savings of

30% or more1

Increase supply air temperature to decrease power consumption for cooling.

Higher Capacity Hot Aisle Containment with external cooling (Outside

Air Economizers) can cool up to 20 kW per cabinet Hot Aisle Containment with heat rejection can cool

up to 30 kW per cabinet Hot Aisle Containment with server intake temp.

Increased to 78°F 1Gartner Research Report – 10/27/2008

Hot Aisle Containment Cooling Hot Aisle Containment Cooling EfficiencyEfficiency

How Much Can You Cool? Average Data Center Designed for 85 Watts per

Square Ft. Requires 60 Tons of Cooling (based on 2500 sq.

ft.) Typical 65°F with a dead band of +/- 2°Example Contained Hot Aisle with Heat Rejection can Cool

up to 220 Watts per Square Ft. Using 60 Tons of Cooling (based on 2500 sq. ft.) 78°F with a dead band of +/- 5°

Prevent IT heat load from entering room Absorb or re-direct heat from back of

cabinets Reduces strain on cooling infrastructure Increase supply set points No air mixing between aisles Achieve 100% cooling utilization by only

supplying cooling necessary for server intake

Hot Aisle Containment with Heat Hot Aisle Containment with Heat RejectionRejection

Hot Aisle Containment separates heated exhaust air from the room air and rejects 100% to outside

Maximizes efficiency Reduces kW of energy

required to cool a kW of heat

Hot Aisle Hot Aisle ContainmentContainment