11 February 2016

Data Center Cooling An Owner’s Perspective

February 2016

Data Center Cooling An Owner’s Perspective

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1 Who Is Digital Realty? Overview of world’s largest data center REIT

2 Data Center Cooling Goals

What does Digital Realty desire in a data center cooling system?

3 Go-To Cooling Technologies

Key cooling technologies in the Digital Realty toolbox

4 Customer Considerations

End-user considerations

5 Questions Q&A and Discussion

Digital Realty Overview (NYSE: DLR)

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WORLD’S LARGEST DATA CENTER REIT

•  One of the 20 largest publicly-traded U.S. REITs

•  Equity market capitalization of approximately $11 Bn USD

•  131 properties comprising 24.5 million rentable square feet in over 30 markets throughout North America, Europe, Asia, and Australia

•  600+ customers with deployment sizes ranging from single cabinets at 2kW load to tens of thousands of square feet with multi-MW loads

•  Over a decade of experience providing data center solutions

•  Track record of 8+ years at five 9’s reliability (>99.999% uptime)

Portland

San Francisco

Sacramento

Silicon Valley

Los Angeles Phoenix

Dallas

Austin Houston

Miami

Atlanta

Charlotte

Northern Virginia

Philadelphia New York

Boston Toronto St. Paul

Chicago

St. Louis

Denver

Dublin London

Manchester

Paris

Sydney

Melbourne

Data Center Portfolio NA, EMEA, and APJ

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Hong Kong

Singapore

DLR Market DLR Regional Campus

Seattle

Amsterdam

Geneva

Japan

Europe 18%

Asia 4%

North America

78%

130 PROPERTIES IN 30 MARKETS ACROSS 10 COUNTRIES AND 4 CONTINENTS

Financial Services

19%

Other Corporate Enterprise

20%

Telcom Network

Providers 27%

Colocation and Cloud 28%

Managed Hosting

6%

Data Center Customer Landscape Different Industries with Different Needs

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INTERNATIONAL NETWORK & TELECOM PROVIDERS

CORPORATE ENTERPRISE USERS

COLOCATION, CLOUD, AND MANAGED SERVICE PROVIDERS

DATA CENTER END-USER BY INDUSTRY

Cooling Goals What’s important to Digital Realty?

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KEY FACTORS IN DATA CENTER COOLING TECHNOLOGY CHOICE

•  Efficient

•  Proven and Reliable

•  Maintainable

•  Geographically appropriate

•  Building appropriate

•  Legally permitted

•  Balance of up-front cost and operating cost

•  Standardized solutions

Our Cooling Journey The Evolution of Cooling Technologies at Digital Realty

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A 12-YEAR HISTORY OF COOLING MISSION CRITICAL SPACES

•  Initial data centers where inherited properties with traditional central chilled water plants

•  First purpose built data centers featured dedicated air-cooled chillers

•  Second generation were dedicated rooftop DX units with a plethora of variations – adiabatic, air-side economization, etc.

•  Current third generation design features dedicated split systems with economization

•  A number of our data center campuses feature multiple cooling technologies

Cooling Technologies DX plus Economization – Liebert DSE

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OPTION #1

Advantages •  Moderate initial cost •  Low maintenance cost •  Minimal indoor space requirements •  Closed system •  Simple operation •  Very good PUE (economization)

Disadvantages •  Requires large roof space area •  Cannot be used in all climates •  Higher peak energy requirements •  Less flexibility with IT load density variations

Cooling Technologies Air Cooled Chillers

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OPTION #2

Advantages •  Moderate initial cost •  Low maintenance cost •  Minimal indoor space requirements •  Closed system not dependent on

make-up water •  Simple operation

Disadvantages •  Use of glycol for freeze protection

requires overall system de-rating •  Not suitable for all climates •  Moderate energy efficiency

Cooling Technologies Central Chilled Water Plant

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OPTION #3

Advantages •  Efficiency and operating cost •  Large tonnage capabilities •  Most flexible with IT load & density variations •  Most flexible option for renovated buildings •  Allows for simple installation of water-side

economizer

Disadvantages •  High initial cost •  Higher maintenance costs •  Occupies significant indoor floor space •  Make-up water for cooling towers

Customer Considerations What do end-users need and want?

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KEEP IT COOL – ALL THE TIME

•  Keep it cool – all the time –  Commitment to the end-user is via

environment SLA’s –  Structured around ASHRAE T9.9

guidelines –  Penalties for exceeding temperature

or humidity ranges

•  Make it as efficient as possible –  End-user is paying the utility bill –  Lowest possible PUE –  Minimize OpEx

•  Ultimately, the cooling technology is the choice of the data center owner and operator

Questions Q&A and Discussion

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DIGITAL CHICAGO – 9333, 9355, 9377 WEST GRAND AVENUE, FRANKLIN PARK

DIGITAL LAKESIDE – 350 EAST CERMAK ROAD, CHICAGO, IL