Liebert ® DCW ™ Family
Chilled Water-Based High Density Cooling For The Data Center
Flexible Approaches For Energy Efficient Cooling
Save up to 70% in cooling energy usage
Normalized Annual Energy Usage
Data center managers are constantly faced with
the challenge of reducing energy consumption
and increasing processing capacity, without
compromising business activities. The Liebert
DCW chilled water-based high density cooling
family provides energy savings of up to 70% over
traditional cooling. The modular approach allows
additional cooling to be added as compute capacity
grows, without disruption of the data center.
100%
80%
60%
70% in Energy
Adding targeted cooling is more cost-efficient
than trying to lower the temperature of the
entire data center by increasing the overall room
air conditioning capacity. Liebert DCW missioncritical cooling systems are specifically designed to
address the higher heat loads generated by tightly
packed electronic rack enclosures.
40%
20%
0%
Liebert DCW Water-Based Systems
Liebert DCW is a family of water-cooled systems
that offers a cost-efficient cooling alternative.
They are designed to work in any size space from
a small computer room to a large data center
with loads from 5 to 35 kW per rack.
Business continuity professionals are
demanding an integrated high heat density
cooling solution — one that considers both
room-level and rack-level needs.
Effective Solutions need to be flexible
Added as heat loads increase, Liebert DCW
cooling capacity allows your facility to
adapt as heat loads rise — allowing cooling
solutions to be added to react to the changes
in your environment.
Traditional Chilled Water
Floormount
Liebert DCP +
Liebert DCD System
Benefits of the Liebert DCW approach include:
Lowest Total Cost of Ownership
Total energy savings potential of up to 70%
More cost-effective than increasing the overall room air
conditioning capacity using floor-mounted cooling
units only.
Minimal floor space requirements.
Flexibility
Can cool more than 35 kW per rack.
Designed to work with or without the hot aisle/cold aisle.
Works with or without raised floor.
Higher Availability
2
Ensures continuous operation of critical IT systems under
extreme heat conditions
Local service and support experts, and 24 hour
support call center
Total Data Center Cost (less land)
Total Data Center Cost (less land)
($000)
($000)
Data Center Cost (New Construction)
Liebert DCW Solutions Cut Capital Costs
Fixed Load of 4,000 kW
$30,000
Cooling System
Building Cost
Less Cooling
$25,000
$20,000
$15,000
$10,000
Data Center Cost (New Construction)
50 W/sq.ft
150 W/sq.ft
400 W/sq.ft
Fixed
Load of 4,000 kW
(500 W/m )
(1500 W/m )
(4000 W/m )
$30,000
$5,000
Cooling
System
Investing in a facility that utilizes a higher rack density design — along with a cooling system designed especially for this
2
2
2
$25,000
$0 size and energy usage.
type of installation — offers a significant cost savings advantage in terms of building
80,000 sq.ft.
8,000 m2
$20,000
Building Cost
Less Cooling
10,000
sq.ft.
1,000 m 2
27,000 sq.ft.
2,700 m 2
The flexible configuration of the Liebert DCW system modules also allows scalability
andSize
significantly
Building
$15,000 for future growth
improves floor space utilization compared to an installation using only floor-mounted cooling units. Installing more
$10,000
50 W/sq.ft
150 W/sq.ft
400 W/sq.ft
Liebert DCW capacity uses little or no additional floor area.
(500 W/m )
(1500 W/m )
(4000 W/m )
Cooling System
Building Cost
Less Cooling
$25,000
$20,000
$15,000
$10,000
$5,000
$0
50 W/sq.ft
(500 W/m2)
80,000 sq.ft.
8,000 m2
150 W/sq.ft
(1500 W/m2)
400 W/sq.ft
2
(4000
W/m )
27,000 sq.ft.
2,700 m 2
10,000 sq.ft.
1,000 m 2
Building Size
The capital costs of a data center are significantly reduced
as higher densities of IT equipment are housed in smaller
sized areas.
Liebert DCW - Supplemental Cooling
Requires less Chiller Capacity
1.40
Chiller Capacity
Latent Load
kW Chiller Capacity per kW
Of Sensible Heat Load
Fan Load
Study — Data
Center Cost (New Construction)
1.20
Sensible Load
400 racks with an average heat load of 10 kW each. Cost
1.00
for building, power, cooling, lighting, fire protection,
15% Lower
0.80
security, etc. included.
Cost of land not included.
0.60
0.40
Building 1: 80,000
sq.ft. (8000m2), 18” (450mm) Raised
0.20
Floor, Designed
for 50 W/sq.ft (500W/m2), Raised-floor
0.00
Precision Air Conditioning
units for cooling.
CW CRAC
Liebert DCW
Building 2: 27,000 sq.ft. (2700m2), 36” (900mm) Raised
Floor. Designed for 150 W/sq.ft (1500W/m2), Raised-floor
Precision Air Conditioning units for cooling.
Liebert
DCW
- Supplemental
Cooling Raised
Building 3: 10,000
sq.ft.
(1000m2),
18” (450mm)
wer to cool 1 kW of sensible heat
with
Operating
Costs
Floor. Designed for
400Lower
W/sq.ft
(4000W/m2),
Raised-floor
Power Usage
0.60
Precision Air Conditioning units (for basic Fan
cooling and
Pump (DCP)
humidity control)
and Liebert XD.
Pump (CW)
0.50
Chiller
0.40
0.30
0.20
0.10
kW Chiller Capacity per kW
kW Chiller Capacity per kW
Of Sensible Heat Load
Of Sensible Heat Load
$30,000
$0
Fixed Load of 4,000 kW
2
2
Liebert
DCW -27,000
Supplemental
Cooling
80,000
sq.ft.
sq.ft. 10,000
sq.ft.
Requires
8,000 m2 less Chiller
2,700Capacity
m2
1,000 m 2
1.40
Chiller CapacityBuilding Size
Latent Load
Fan Load
Sensible Load
1.20
1.00
0.80
15% Lower
Liebert DCW - Supplemental Cooling
0.60Requires less Chiller Capacity
0.40Chiller Capacity
1.40
0.20
1.20
0.00
1.00
CW CRAC
0.80
Latent Load
Fan Load
Sensible Load
Liebert DCW
15% Lower
0.60
One of the major
areas of savings identified with the use of
0.40
Liebert DCW equipment
is the ability to reduce chiller plant
size. This is because
0.20 the chiller typically is sized for the total
gross capacity 0.00
of theLiebert
raised-floor
cooling units.Cooling
The 65% lower
DCW - Supplemental
CW
CRAC Operating
DCW
with
Lower
Costs
fan load of the Liebert
DCW
System Liebert
modules
and the fact
Power
Usage in a capital chiller size savings of
they are 100%0.60
sensible
results
Fan
Pump (DCP)
15% or more.
kW power to cool 1 kW of sensible heat
kW power to cool 1 kW of sensible heat
Total Data Center Cost (less land)
($000)
Data Center Cost (New Construction)
2
$5,000
0.50
Pump (CW)
Chiller
0.40
0.30
Liebert DCW - Supplemental Cooling
with Lower Operating Costs
32% Lower
0.20
Power Usage
0.60
27% LowerFan
0.10
Pump (DCP)
Pump (CW)
0.50
0.00
Chiller
CW CRAC CW CRAC Liebert DCW Liebert DCW
0.40
at 100%
at 50%
at 100%
at 50%
0.30
Capacity
Capacity
Capacity
0.20
32% Lower
27% Lower
0.10
0.00
Capacity
CW CRAC
at 100%
Capacity
CW CRAC Liebert DCW Liebert DCW
at 50%
at 100%
at 50%
Capacity
Capacity
Capacity
The smaller chiller plant and lower fan load result in
significant energy savings as well. A 27% energy savings is
very conservative.
32% Lower
27% Lower
3
High Heat Density.
High Temperatures.
This compacted capacity means
higher heat densities. What was once
a 1 kW rack or 10 kW rack may now
exceed 30 kW. This requires a shift in
focus from a traditional room-based
view of cooling to a rack-based view.
IT decision makers must consider
both “watt per square foot” and
“kW per rack” when evaluating
cooling solutions.
10,000
8,000
6,000
4,000
2,000
1,000
800
600
400
200
100
60
ity
ens
eD
rem
t
x
n-E
icatio
mun
rs
Com
Serve
r
te
u
Comp
ers
rv
e
S
ge
ne)
Stora
ndalo
ns (sta
statio
Work
Storage Servers
Workstations (standalone)
Tape Storage
age
Tape Stor
1992
1994
1996
1998
2000
2002
2004
2006
2008
2010
2012
2014
100,000
60,000
20,000
10,000
6,000
4,000
2,000
800
Year of Product Announcement
ASHRAE, Datacom Equipment Power Trends and Cooling Applications, 2005. © American
Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., www.ashrae.org
And, They Attack Your Facility in Two Ways
Hotter Facilities
Hot Spots
As processor capabilities increase, so do
computer room power densities—from
50 Watt per square foot (540W/m2) to
over 300 Watt per square foot (320W/
m2). Your whole data center just keeps
getting hotter.
50W to 300W
4
eme Density
Communication - Extr
and Custom
Blade
1U,
rs
Serve
Computer
y
Communication - High Densit
and Greater
2U
Computer Servers
Heat load per equipment footprint
(watts/equipment sq.m.)
No Relief in Sight: Heat Loads Rising
Heat load per equipment footprint
(watt/equipment sq.ft.)
With constant introduction of new
technology, the computing capacity
that once filled an entire room can
now be contained within a single
rack. Blade servers, communication
switches and other electronics
are packed into racks — creating
increased heat densities that cannot
be effectively cooled by traditional
cooling solutions.
The Liebert DCW cooling
solution can provide 200 kW of
sensible cooling, with modules
capable of providing localized
cooling up to 35 kW per rack.
Compounding the problem, this higher
heat load is not evenly distributed
throughout the room. Sometimes,
power densities can grow into hundreds
of Watt per square foot, creating
localized “hot spots” of extreme heat.
600+W
Room-Neutral Cooling
RACK
RACK
RACK
RACK
COLD AISLE
RACK
HOT AISLE
RACK
COLD AISLE
RACK
HOT AISLE
RACK
80 / 27
73 / 23
66 / 19
60 / 16
Heat Load = 3 kW Per Rack With
Hot Aisle /Cold Aisle Layout
˚F ˚C
COLD AISLE
RACK
HOT AISLE
RACK
COLD AISLE
RACK
HOT AISLE
98 / 37
88 / 31
79 / 26
69 / 21
60 / 16
Heat Load = 6 kW Per Rack With
Hot Aisle /Cold Aisle Layout
˚F ˚C
COLD AISLE
RACK
HOT AISLE
RACK
COLD AISLE
RACK
115 / 46
HOT AISLE
The Liebert XDK-W enclosed rack contains and cools the
hot air within the cabinet.
˚F ˚C
87 / 31
RACK
70 / 21
Heat Load = 3 kW Per Rack Without
Hot Aisle /Cold Aisle Layout
RACK
The Liebert DCD door neutralizes the server’s exhaust air
before it leaves the rack.
80 / 27
60 / 16
COLD AISLE
90 / 32
COLD AISLE
Some room and equipment designs preclude the
hot aisle/cold aisle configuration. These are often well-suited
to cooling with the Liebert DCW system.
˚F ˚C
100 / 38
COLD AISLE
A common way to improve performance of existing raised
floor cooling applications has been the “hot aisle/cold aisle”
approach. In this configuration, rows of equipment racks are
arranged in alternating “hot” and “cold” aisles. Only the cold
aisles have perforated floor tiles that allow cool air to come
up from under the raised floor. The Liebert DCW solution is
compatible with existing hot aisle/cold aisle application.
Unfortunately, even when using a hot
aisle/cold aisle configuration, the limits
of standard underfloor cooling are soon
reached as rack heat loads increase.
101 / 38
87 / 31
73 / 23
60 / 16
Heat Load = 10 kW Per Rack With
Hot Aisle /Cold Aisle Layout
Side views of Computational Fluid Dynamics (CFD) by Fluent
showing limitations of hot aisle/cold aisle approach as heat
load increases.
5
Liebert DCW Cooling Solutions
200 kW of Sensible Cooling
The Liebert DCP Coolant Pumping Unit is the key to the performance,
efficiency and space saving design of the Liebert DCD passive chilled water
door and Liebert XDK-W water- cooled rack enclosure. The unit houses
the isolating heat exchanger between the Liebert DCD/XDK-W circuit fluid
and building chilled water, the control valve, the dual redundant pumps
and the system controls. It controls the fluid temperature above the actual
room dewpoint. The Liebert DCP can also be used with other brands of
rack cooling equipment.
Building Chilled Water
Building
Chilled
Water
Liebert
DCP Pumping
Unit
Liebert
DCP Pumping
Unit
Liebert DCD or Liebert XDKW
Chilled
Water
Liebert DCD or Liebert XDKW
Liebert DCD or Liebert XDKW
Chilled
Water
Liebert DCD or Liebert XDKW
The Liebert DCP isolates the building’s chilled water circuit from the chilled water circuit within
the data center. Separating the data center from the building chiller also minimizes the impact of
a leak within the data center. Should a leak occur, the volume of water is limited to the amount
within the secondary piping system instead of the entire building chiller system. The separation
from the building chiller system also ensures proper water quality to the cooling modules in
the data center by creating a closed loop system. The Liebert DCP circulates the chilled water to
cooling modules (Liebert DCD or Liebert XDK-W) while preventing condensation by maintaining
the water temperature above the room dew point.
Intelligent System Control
The Liebert iCOM control system on the Liebert DCP features
maintenance history, spare parts list, Liebert IntelliSlot® for up to two
cards (web compatibility and BMS), and comprehensive monitoring.
The enhanced Liebert iCOM with its IT-focused user interface allows
real-time monitoring and data capture. Status may be reported back to
the BMS via Liebert IntelliSlot communications cards.
6
Room-neutral Cooling Over 35 kW Per Rack
High density cooling that won’t add heat to your room.
Liebert DCW Cooling Modules
Open Architecture
Liebert DCD Rack Door Cooling Module
Replaces the back door of a server enclosure, providing cooling without
increasing the rack footprint. The module uses the server fans within the
protected rack to provide airflow, providing the most energy efficient design.
Can cool over 35 kW per Rack
No electrical components
No noise
Stationary connections
Full access to rear of rack
Adapts to Emerson Network Power DCM racks or racks by other manufacturers
Open and Closed Architecture Systems as defined by ASHRAE
Open architecture systems utilizes cooling coils
near the heat load either inside or outside the open
server rack and use the room air volume as a thermal
storage to ride through short power outages.
Closed architecture fully encloses the rack with the
cooling coils inside. Other provisions are required for
power loss ride through.
For refrigerant-based systems, the Liebert XD system is designed to maximize cooling efficiency while avoiding the electrical hazards that may be present
in a water-based system. The Liebert XD system can cool rack loads from 8 to 40 kW per rack in rooms 1200 sq ft or larger.
(See Liebert XD Brochure SL-11265 for more details.)
7
Emerson Network Power is the world’s leading provider of critical infrastructure
technologies and life cycle services for information and communications technology
systems. With an expansive portfolio of intelligent, rapidly deployable hardware
and software solutions for power, thermal and infrastructure management,
Emerson enables efficient, highly-available networks.
Emerson Network Power
Global Headquarters
1050 Dearborn Drive
P.O. Box 29186
Columbus, Ohio 43229
800 877 9222 Phone (U.S. & Canada Only)
614 888 0246 Phone (Outside U.S.)
Contact@EmersonNetworkPower.com
Emerson Network Power
Caribbean and Latin America
Office – United States of America
+1-954-984-3452 Phone
Ask.Cala@Emerson.com
Emerson Network Power Canada
3580 Laird Rd Unit 1
Mississauga
Ontario L5L 5Z7
+1 905 569 8282
Ask@EmersonNetworkPower.com
liebert.com
24 x 7 Tech Support
800 222 5877 Phone
614 841 6755 (outside U.S.)
EmersonNetworkPower.com
While every precaution has been taken to ensure accuracy and
completeness in this literature, Liebert Corporation assumes no
responsibility, and disclaims all liability for damages resulting
from use of this information or for any errors or omissions. ©
2015 Liebert Corporation. All rights reserved throughout the
world. Specifications subject to change without notice. All names
referred to are trademarks or registered trademarks of their
respective owners. ® Liebert is a registered trademark of the Liebert
Corporation.
Emerson Network Power and the Emerson Network Power logo
are trademarks and service marks of Emerson Electric Co. ©2015
Emerson Electric Co.
SL-17355 (R010/15)
Printed in USA