Emerson Liebert Economizer Solutions Brochures and Data Sheets

Liebert Economizer Cooling Solutions

Reduce Cooling Costs by up to 50% Without Compromising Reliability

Precision Cooling for
Business-Critical Continuity

TM

Lower Cooling Energy Consumption by up to 50%

Fluid- and Air-side economizers take advantage of cold outside

temperatures to provide “free cooling” cycles that reduce or

eliminate the operation of data center precision cooling system

compressors and pumps.

Using economizers, you can lower cooling energy usage by up

to 50% − depending on the average ambient temperature and
humidity of your site.

A Focus on Energy Efficiency

While many IT professionals are considering economizers in
preparation for potential code or legislation changes, a move
toward improved efciencies can pay off with rewards of its own −
especially in terms of lower operating costs and utility incentives.
For example, some utility companies offer rebates for using energy­efcient equipment, quickly increasing your return on investment
and overall savings.

Geographic regions of greatest cooling economization opportunity

Consider Chiller Plant Economizer
Consider Chiller Plant or GLYCOOL Cooling Economizer
Consider Chiller Plant or Air Economizer
Consider Chiller Plant, Air Economizer or GLYCOOL Cooling Economizer

Industry Best Practices

When making the choice to use an economizer solution, it is critical
to analyze how changes will impact your entire data center.

®

Industry thought leader ASHRAE

recommends that IT professionals
investigating the use of economizers in their data centers
consider the impact of incorrect application, and/or maintenance/
operational issues, on the life of protected sensitive equipment:

■

High humidity can cause condensation that reduces server life and

affects operation

■

Low dew point can result in problems such as static electricity

■

Gaseous or particulate contaminants can adversely affect sensitive

electronics

■

Operational reliability, including redundancy, is required to

achieve IT initiatives

■

Reliable water sources for cooling towers

■

Chiller condensate sump heaters for cold climate operation (or

other solutions)

Why Emerson Network Power?

For more than 40 years, Liebert technologies have led the industry
in precision cooling for data centers, including economizing
solutions such as the free-cooling GLYCOOL system.

Our depth and breadth of experience make us uniquely prepared to
serve as trusted advisors to IT professionals. Liebert representatives
can help you decide which economization method is the right
solution for your application. They will guide you through the
complexities of environmental factors affecting your decision
making, including temperature ranges, dew point, humidity,
and the issue of gaseous and particulate contaminants, as well as
maintenance issues that impact all types of econimizers.

It’s how we deliver Efciency Without Compromise™ − providing
high availability products with energy-efcient technologies.

Efciency Without Compromise

Efciency Without Compromise provides a path to optimize data center infrastructure around design, operating and management
efciencies – while maintaining or improving availability. This is achieved through the proper selection and utilization of cooling, power and
monitoring technologies, supported by key services and local expertise.

INFRASTRUCTURE
MANAGEMENT

Impro ving perfo rmance
of the IT i nfrastru cture
and environment

ECO AVAILABILITY

Balan cing high leve ls
of availability and
efciency

2

FLEX CA PACITY

Adapti ng to IT change s
for continuous
optimization and
design exibility

HIGH DENS ITY

Delivering architectures
from 10- 60kW/rack to
minimi ze space and cos t

Atlanta Chicago Seattle

Fluid Economizer Liebert

Cooling

Tower

Dry-

cooler

CW or DS

with Air

Economizer
Full Economizer Hours 25% 17% 18% 48% 41% 14% 39% 23% 27%
Partial Economizer Hours 52% 34% 33% 39% 28% 22% 61% 61% 15%
Estimated Total Energy Savings 51% 36% 34% 67% 58% 25% 70% 49% 34%

The effect of ambient conditions in representative cities on economization hours and resultant energy savings, using different
economization methods (assumes cold aisle temperature 71°–80° F; CRAC return temperature 85° F). Cooling tower calculations were
made with Liebert chilled water-based precision cooling products. Drycooler calculations were based on Liebert precision cooling products
equipped with GLYCOOL option. Air economizer calculations based on 41.9° F dew point limitation.

Fluid Economizer Liebert

Cooling

Tower

Dry-

cooler

CW or DS

with Air

Economizer

Fluid Economizer Liebert

Cooling

Tower

Dry-

cooler

CW or DS

with Air

Economizer

Liebert Precision Cooling Economization

In accordance with ASHRAE’s guidance, and in keeping with our position as the industry’s power and cooling leader, Emerson Network
Power provides effective, efcient economizer solutions. Emerson Network Power offers uid-side economization solutions and an air-side
economizer – and Liebert technologies are well suited to work with economization solutions from third-party providers.

No economizer

Full economizer

Partial economizer

■

Potential dependant on dew point

Comparative hours of economizer operations through varying CR AC supply and return temperatures in three cities representing distinct ambient conditions
(partial economizer operation = outside ambient used to precool or assist in cooling of data center return air).

Fluid-Side vs. Air-Side Economization Comparison

Fluid-Side Air-Side

Advantages

■

Can be used in any climate cold enough to provide effective hours

of economization; Glycol-based systems operate effectively at
the widest range of outdoor ambient temperatures

■

Wider operating range results in 2x–3x more effective hours than

air economizer systems in most climates

■

No outside air is introduced to the data center, so the ltration

and humidication functions of the CRAC unit operate normally
to ensure optimal air quality and relative humidity

■

Service requirements and complexities are reduced compared

to air-side economizers; less lter changing and maintenance are
required

■

Compatible with Liebert DS, Liebert CW, Liebert Challenger 3000

and Liebert XD precision cooling systems (downow and upow)

Challenges

■

Indirect piping and control are more complex

■

Higher initial capital costs

■

Added water use for cooling tower

Advantages

■

Compatible with moderate climates

■

More operating hours than uid-side economizers, if

humidication is added

■

Can be used on systems that don’t use water for heat rejection

■

Lower initial capital costs

■

Uses less water than uid-side economizers

■

Compatible with Liebert DS and Liebert CW precision cooling

products (downow only)

Challenges

■

Ductwork required to get air into IT space

■

Narrower range of effective hours of operation if used without

humidication

■

Dust and pollen sensors are required to minimize lter

maintenance; humidity control can be costly and challenging

■

Need proven, intelligent controls to ensure proper temperature

and humidity

■

High-density applications may require more localized cooling

■

Mildew minimization actions required

3

Fluid-Side Cooling Economization Strategy

Fluid-side economizers work in

conjunction with a heat rejection loop

− consisting of either a cooling tower,

evaporative cooler or drycooler − to

satisfy cooling requirements.

These systems are incorporated into either
a chilled water or glycol-based cooling
system. For economizer operation, the uid
used in the cooling system passes through
an additional heat exchanger to cool the
room air, reducing or eliminating the use of
cooling compressors and pumps.

Energy-efcient Liebert technologies
are well suited to uid-side cooling
economization.

GLYCOOL Cooling

for Liebert DSTM and Liebert ChallengerTM 3000

How the Liebert GLYCOOL System Works

The self-contained Liebert GLYCOOL system comprises a compressorized Liebert glycol
system with advanced controls, a standard cooling coil, an additional “Econ-o-coil” free
cooling coil and a drycooler.

At ambient temperatures above the CRAC return temperature (less the drycooler
approach), the system functions as a normal glycol-cooled system. As outdoor
temperatures drop, the temperature of the uid in the heat rejection loop drops also.
Once it is cold enough outside, the control opens the modulating valve to the Econ-o-coil
circuit. Depending on ambient conditions, the system either reduces or eliminates cooling
compressor and pump operation.

Savings

The Liebert GLYCOOL system delivers an average annual energy savings of 20–50%.

A-frame coil inside

Econ-o-coil rests
on A-frame coil

Liebert
Drycooler

Centrifugal

blower

Compressors

Liebert GLYCOOL System

Providing free cooling by using outside air through the Econ-o-coil circuit to maximize cooling
efciencies

Glycol-cooled
condensers
and Paradenser

tubes

Glycol
circulating
pump

4

Chiller Plant

Partnered with Liebert CWTM and Liebert Challenger 3000

How Chiller Plant Economization Works

The chilled water loop that feeds multiple chilled water-based CRAC units uses cold outdoor
temperatures to cool the chilled water loop, effectively reducing pump operation.

Full economization hours are dependent upon the outdoor wet bulb temperature,
the approach of the cooling tower and heat exchanger, and the chiller water supply
temperature. Partial economization hours are dependent upon the factors listed above, as
well as the chilled water return temperature.

Savings

A chiller plant, partnered with Liebert precision cooling technologies, delivers an average
annual energy savings of 40–60%.

Cooling TowerPumpCRAC Units

Why Liebert Products and Services?

■

Liebert iCOM® Control – Based on

years of data center precision cooling
experience, the intelligent Liebert iCOM
control dynamically optimizes the
operating parameters of uid-side

economizer solutions

Provides advanced
control and
monitoring, which
allows units to work
together as a single
system to enhance performance and
improve efciency

■

Service − Industry-leading

local service and support
network ensures timely
maintenance, service and
parts availability

■

Industry Leadership –

Liebert advanced technologies
can help you cut operating costs,
improve efciencies, reduce energy

consumption, ensure reliable

performance and maintain optimal
conditions within your IT environment

■

Compatibility – The Liebert GLYCOOL

system is available on Liebert DS and
Liebert Challenger 3000 (both downow
and upow)

Chiller

Plate Heat E xchanger

Economizer System Chiller Plant

Fluid ow during uid-side cooling economization – taking advantage of environmental conditions
to improve cooling efciencies

Liebert CW Chilled
Water Based Precision
Cooling is designed to
handle high heat loads
– using an existing
building chiller as a
chilled water cooling

source

Liebert Challenger 3000

provides complete
control of temperature,
humidity and air ltration

Liebert DS Precision
Cooling System
provides efcient,

precise, reliable control

of room temperature,
humidity and airow
for operation-critical
equipment

5

Air-Side Cooling Economization Strategy

Air-side economizers use outside air to

supplement data center cooling. They

utilize a system of sensors, ducts and

dampers to control the entry of outside

air to help satisfy cooling demands.

Sensors monitor outside and inside air
conditions, and when outside conditions
are suitable for cooling, the economizer
adjusts the dampers to introduce the
outside air, making it the primary cooling
source. This “free cooling” reduces
or eliminates the need for cooling
compressors, resulting in increased
efciencies and signicant energy savings.

Full “free cooling” is attained when the
outside air is below the entering cold aisle
temperature.

Partial benet is attained when the outside
air temperature is 2 degrees Fahrenheit
lower than the air temperature returning
to the Cooling Room Air Handlers and dew
point is less than 59 degrees and above 41.9
degrees Fahrenheit.

Air Economizer System

Liebert Air Economizer System installed on a Liebert CW chilled water-based precision
cooling system in downow conguration – using lower outside temperatures to minimize
cooling compressor and pump use.

Normal data center

cooling operation

“Free cooling” using lower
outside temperatures to
effectively cool the data center

Maximizing Economization with Liebert iCOM Control

Intelligent Liebert iCOM control is ideally suited for sensing and controlling Liebert economizers

− or those supplied by other manufacturers.

Multiple parameters within an IT environment add complexity and can be difcult to monitor
and manage, but the Liebert iCOM control simplies oversight and puts you back in control −
with substantial benets over custom congured controls.

Liebert iCOM control:

■

Factory tested and warranted

■

Offers multiple levels of monitoring and control – and compatibility with Liebert SiteScan® Web

■

Provides consistent, eld-proven operation

■

Shares a common platform with Liebert Precision Cooling Systems

■

Equipped with factory-provided installation, operation and maintenance instructions

■

Supported by factory-trained technicians

6

Lieber t iCOM Control System

Liebert Air Economizer System

with Liebert iCOM Control for Liebert DS and Liebert CW

How the Liebert Air Economizer System Works

The Liebert Air Economizer System reduces cooling costs by taking advantage of cool outdoor
air to condition indoor spaces, reducing or eliminating compressor operation in Liebert DS
units, and eliminating pump operation in Liebert CW, as well as reducing or eliminating the
compressor operation of the supporting chiller plant. The Liebert Air Economizer System is
equipped with high-efciency ltration and a sensor network that detects clogged lters –
and it communicates with your existing Business Management System.

The Liebert Air Economizer system comprises a plenum with air mixing box; dual enthalpy
controls with Liebert iCOM control (temperature/humidity sensors for outdoor air, return air
and supply air). The Liebert Air Economizer system must be applied to each CRAC unit.

Three Stages of Cooling

Depending on environmental conditions, the Liebert Air Economizer will adjust to cool your
IT environment with:

■

100% outdoor air

■

Mixed outdoor air and compressor/pump cooling

■

100% compressor/pump cooling

Why Liebert Products and Services?

■

Liebert iCOM control – Dynamically

optimizes both the precision cooling
system and the operating parameters of
air-side economizer systems

■

Temperature and humidity sensors –

Our sensors focus on both temperature
and humidity, because ignoring the
impact of humidity can have a serious
short- and long-term impact on
your IT equipment and your facility’s
infrastructure

■

Service − Industry-leading

local service and support
network ensures timely
maintenance, service and
parts availability

■

A long history of success

– Liebert DS and Liebert CW represent
the newest generation of the industry’s
most reliable and popular precision
cooling system, the Liebert Deluxe
System/3

■

Compatibility – The Liebert Air

Economizer System can be used with the
Liebert DS and Liebert CW – as well as
the Liebert iCOM Control

Liebert CW Chilled
Water Based Precision
Cooling is designed to
handle high heat loads

Savings

The Liebert Air economizer system delivers an average annual energy savings of 30–60%.

Solution Compatibility

Liebert

iCOM

Control

Lieber t DS upow

Lieber t DS downow

Lieber t CW upow

Lieber t CW downow

Lieber t XDTM Systems

Lieber t Challenger 3000

Lieber t Deluxe System/3TM
downow systems retrotted
with Liebert iCOM controls

GLYCOOL

Cooling

X X

X X X

X X X

X X X

Chiller Plant

Economization

X X

X X X

X X

Liebert Air

Economizer

Liebert DS Precision

Cooling System
provides precise,
reliable control of

room temperature,

humidity and airow

7

Ensuring the High Availability of
Mission-Critical Data and Applications.

Emerson Network Power, a business of Emerson (NYSE: EMR), is the
global leader in enabling Business-Critical Continuity™ from grid to chip
for telecommunication networks, data centers, health care and industrial
facilities. Emerson Network Power provides innovative solutions and
expertise in areas including AC and DC power and precision cooling
systems, embedded computing and power, integrated racks and
enclosures, power switching and controls, monitoring, and connectivity.
All solutions are supported globally by local Emerson Network Power
service technicians. Liebert AC power, precision cooling and monitoring
products and services from Emerson Network Power deliver Efciency
Without Compromise™ by helping customers optimize their data center
infrastructure to reduce costs and deliver high availability.

Emerson Network Power

Liebert Corporation

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While eve ry preca ution has bee n taken to ensur e accurac y and
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responsibility, and disclaims all liability for damages resulting
from use o f this informa tion or for any e rrors or om issions.

© 2010 Lieber t Corporat ion. All rig hts reser ved throug hout
the worl d. Specic ations subje ct to change w ithout not ice.

All name s referred to a re trademar ks or regis tered trad emarks
of their r espectiv e owners.

® Lieber t is a registe red tradem ark of the Lieb ert Corp oration.
SL-18045 (R02/10) Printed in USA

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