Liquid Cooling
Systems
www.lairdtech.com
About Laird
Laird designs and manufactures customized, performance-critical products for
advanced electronics and wireless systems. The company is a global market
leader in the design and supply of electromagnetic interference (EMI) shielding,
thermal management products, specialty metal products, signal integrity
components, and wireless antennae solutions, as well as radio frequency (RF)
modules and systems. Laird partners with its customers to customize product
solutions for applications in many industries including:
• Telecommunications
• Mobile Communications
• Network Equipment
• Automotive
• Industrial Laser
• Analytical
• Aerospace & Defense
• Healthcare
• X-Ray Scanning
• Semiconductor
Customized Solutions
Since there are many unique attributes that need to be ascertained from each
application, often a liquid cooling solution requires a custom configuration to
optimize performance and long life operation. The type of coolant used will
depend on the desired control temperature. Laird has the know-how to design
cooling systems that are compatible with water, water-glycol, transformer oil
or various corrosion prohibitors. LCS can also be quite complex and require
temperature control of multiple liquid circuits or multiple pressure drop
settings in order to accommodate low and high pressure conditions. Laird has
experience with both and offers strong engineering design services with a
global presence that supports onsite concept generation, thermal modeling,
mechanical and electrical design and rapid prototyping. The company also
offers validation test services to meet unique compliance standards for each
industry, such as UL and MIL-STDs, or a unique standard specific to a medical,
industrial or semiconductor account.
Laird offers customers unique product solutions, dedication to research and
development, as well as a seamless network of manufacturing and customer
support facilities across the globe.
Total Thermal Solution Provider
Due to the increasing complexities of thermal management systems, and the
constant pressure to reduce product development cycle times, companies are
relying on external, specialized thermal management expertise more often.
Laird has more than 35 years of experience in the design, manufacture and
servicing of liquid cooling systems for various high end markets. While Laird
focuses on designing the optimal liquid cooling solution, its customers are free
to focus on designing a better end instrument. All products are manufactured
in an ISO 9001 and ISO 14001 certified facility and are built to meet the
needs of strict process control requirements found in many of the medical,
industrial, and semiconductor industries. All parts are procured from strategic
suppliers with a proven track record of supplying highly reliable components,
and offer strong design support for customization. Laird also offers after sales
service support to repair or replace units that have been in the field for more
than two decades.
A Brief Introduction
to Liquid Cooling Systems
Thermal management of electronic components and systems is more
challenging than ever. Power densities continue to increase, while product form
factors continue to shrink. Engineers must now consider thermal management
early on in the product development cycle to make sure sufficient space
and power is available to remove heat from their system. Simple thermal
management solutions, such as a heat sink fan mechanism, are no longer viable
to keep critical systems operating at peak performance. In today’s complex
operating environment, liquid cooling systems are required to dissipate a
large amount of heat in a densely packed electronic environment. Maximum
operational life is required to keep system maintenance and repair down time
to a minimum. Temperature stabilization has especially become critical, as next
generation systems require more precise temperature control.
Liquid cooling systems (LCS) are self-contained units that recirculate a coolant
to a predefined temperature set point. There are two types of liquid cooling
solutions. The first is a liquid heat exchanger system that cools the coolant in a
liquid circuit to ambient temperature. This system consists of a pump to circulate
coolant, a liquid heat exchanger to dissipate heat, and a liquid circuit to transfer
coolant from the heat source to the LCS. The second type is a compressor-based
system, or recirculating chiller, that encompasses a compressor system instead
of a liquid heat exchanger assembly. It is used to cool the coolant to well below
ambient and dissipate heat to the outside environment. Additional features can
be included to add temperature control, variable flow control, bypass control,
coolant filtration and electronics in order to meet unique attribute requirements.
Compatibility of material selection to coolant is also critical in order to minimize
corrosion and keep loose oxidized particles from obstructing flow.
PID Liquid to Liquid System
Benefits of Using
Liquid Cooling Systems
LCS are unique to the thermal management market in that they use a coolant
to transfer heat. Most engineers are concerned about introducing liquids to
their electronics, but if unit is designed and assembled correctly, it becomes a
non-issue. LCS have several advantages over conventional air cooled systems.
•
Liquid Cooling Applications
Laird provides robust liquid cooling solutions for many of the high performance
applications found in the medical, industrial, and semiconductor markets.
Systems are designed to maximize temperature stabilization at above, below, or
equal to ambient temperature. Service life expectations can exceed more than
20 years in the field.
High Heat Pumping Capacity.
Liquid heat exchangers can reduce the
thermal resistance of conventional heat sink fan dissipation mechanisms by
a factor of 10 or more. This is due to the poor thermal properties of heat
transferring in air versus in coolants such as water.
High Heat Flux Density.
LCS can remove up to five times the
amount of heat per square area over conventional air cooling systems.
This becomes advantageous in densely packed electronics with limited
space to accommodate an air cooling mechanism.
Heat Routing.
Liquid cooling allows the integration of a small heat
exchanger to be located at the heat source, which then routes heat away
through a liquid circuit. This is advantageous in densely packed electronics
where a conventional air cooling system pushes air all around system
and potentially adds heat to the system from other hot electronics in
close proximity.
Rapid Cool Down.
Cool down time is a function of cooling capacity.
LCS have larger cooling capacities than conventional heat sink fan
mechanisms, which will reduce the time it takes to reach temperature.
Lower Noise.
Systems with high heat removal requirements of one
kilowatt or higher require much larger fans to generate the air flow
needed to dissipate heat. This makes the air cooling system noisier,
exposes system to higher vibration and potentially requires a larger
system than that of an LCS.
Healthcare Diagnostics & Treatment
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Medical Imaging
Medical Lasers
Clinical Diagnostics
Centrifuges
Radiation Therapy
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•
Industrial Instrumentation
•
•
•
•
•
Security X-Ray Scanning
Non-Destructive Test
Digital Printing
Electron Microscope
Industrial Lasers
•
Semiconductor Fabrication
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Metrology
Plasma/Wet Etch
Lithography
Chemical/Physical Vapor Deposition
Rapid Thermal Processing
•
Liquid Heat Exchanger
S Y S T E M S
Laird offers three (3) types of liquid heat exchanger systems. Standard cooling capacities range from 500 W to 5000 W. However,
custom solutions have been designed to remove up to 40 KW of heat. Standard heat transfer configurations are either Liquid-Air or
Liquid-Liquid systems. All systems are designed to operate using either water, water with glycol (antifreeze), or oil as a coolant.
WL Series, Water Cooled
Water cooled systems are designed to circulate water or a water glycol (antifreeze) mixture and keep the temperature of the
coolant at or near ambient. The WL Series is a re-circulating liquid to air heat exchanger that offers dependable, compact
performance by removing large amounts of heat from a liquid circuit. The coolant is re-circulated using a high pressure pump
to assure maximum flow rate. Heat from coolant is absorbed by a radiant heat exchanger and dissipated into the ambient
environment using a brand name fan.
• Cooling to ambient
• High heat pumping capacity
PART
DESCRIPTION
COOLING CAPACITY
(WATTS)
MAX PRESSURE
DROP (BARS)
• Compact form factor
• Long life operation
PUMP FLOW RATE
(LPM)
INPUT VOLTAGE
(VAC)
DIMENSIONS
(L X W X H) (CM)
WEIGHT
(KGS)
WL 500
WL 1000
WL 1500
WL 2000
WL 3000
WL 5000
500
1,000
1,500
2,000
3,000
5,000
2.5
6.0
6.0
6.7
8.0
7.0
2.3 @ 4 bar
4.4 @ 4 bar
4.0 @ 4 bar
4.4 @ 4 bar
6.0 @ 4 bar
6.5 @ 3 bar
230
230
230
230
230
230
37 x 30 x 15
33 x 29 x 30
48 x 40 x 48
30 x 30 x 50
48 x 40 x 48
48 x 40 x 48
11
17
38
26
38
38
www.lairdtech.com
Liquid Heat Exchanger
S Y S T E M S
OL Series, Oil Cooled
Oil cooled systems are designed to circulate transformer oil and are used in applications where the temperature at the
heat source exceeds the operational temperature limit of water based coolants. The OL Series is a recirculating liquid to
air heat exchanger that offers dependable, compact performance by removing large amounts of heat from a liquid circuit.
The coolant is recirculated using a high pressure pump to assure maximum flow rate. Heat from coolant is absorbed by a
radiant heat exchanger and dissipated into the ambient environment using brand name fan.
• Cooling to above ambient (where the temperature at the heat source is
at or exceeds the limit of conventional coolant operating temperatures)
• High heat pumping capacity
• Compact form factor
• Long life operation
PART
DESCRIPTION
COOLING CAPACITY
(WATTS)
MAX PRESSURE
DROP (BARS)
PUMP FLOW RATE
(LPM)
INPUT VOLTAGE
(VAC)
DIMENSIONS
(L X W X H) (CM)
WEIGHT
(KGS)
OL 4503
OL 15000
4,500
15,000
9.0
1.75
23 @ 3.5 bar
20 @ 1.0 bar
230
230
75 x 35 x 65
70 x 64 x 98
54
82
Liquid-Liquid Series
Liquid-Liquid systems use facility water as a hot side heat dissipation mechanism, which increases the cooling capacity while
maintaining form factor. WW series systems are designed to operate using water as coolant, while OW Series systems are
designed to operate using oil as coolant.
• Cooling to ambient
• High heat pumping capacity in smallest form factor
• Long life operation
PART
DESCRIPTION
COOLING CAPACITY
(WATTS)
COOLANT
TYPE
MAX PRESSURE
DROP (BARS)
PUMP FLOW RATE
(LPM)
INPUT VOLTAGE
(VAC)
DIMENSIONS
(L X W X H) (CM)
WEIGHT
(KGS)
WW 3001
WW 5001
OW 4002
3,000
5,000
4,000
Water
Water
Oil
6.7
6.5
9.0
5.4 @ 4 bar
10 @ 4 bar
17 @ 3.5 bar
230
230
230
45 x 27 40
45 x 30 x 37
62 x 35 x 55
24
24
45
WLK Series, Recirculating Chillers
The WLK Series is a compressor-based recirculating chiller that offers dependable, compact performance by controlling
the temperature of water or water with glycol (antifreeze) in a liquid circuit. The coolant is recirculated using a pump
with high MTBF. Heat from the coolant is absorbed by a durable, compressor-based system and dissipated to the ambient
environment. The unit is regulated with an easy-to-use digital temperature controller with push button interface. The unit is
housed inside a durable sheet metal casing. Standard cooling capacities range are available up to 3 KW. However, custom
solutions have been designed to remove up to 200 KW of heat.
• Cooling to below ambient
• High heat pumping capacity
• Variable temperature control
PART
DESCRIPTION
COOLING CAPACITY
(WATTS)
CONTROL TEMP
RANGE (°C)
• High temperature stability
• CFC free refrigerants
• Long life operation
MAX PRESSURE
DROP (BARS)
PUMP FLOW RATE
(LPM)
INPUT VOLTAGE
(VAC)
DIMENSIONS
(L X W X H) (CM)
WEIGHT
(KGS)
WLK 21
WLK 31
2,000
3,000
5 – 30°C
5 – 35°C
8.0
6.7
6.0 @ 6 bar
6.0 @ 4 bar
230
230
59 x 61 x 92
59 x 61 x 92
115
115
www.lairdtech.com
Liquid Cooling System Turn-key
C A P A B I L I T I E S
Since there are many unique attributes that need to be ascertained for each application, often the optimal
liquid cooling solution ends up requiring a custom configuration. Laird has over 35 years of experience in
the design, manufacture and servicing of custom liquid cooling systems for various high end markets. Our
engineering team has the know-how to design cooling systems that are compatible with water, water-
glycol, transformer oil, or various corrosion prohibitors. LCS can also be quite complex and require the
temperature control of multiple liquid circuits or multiple pressure drop settings in order to accommodate
low and high pressure conditions. Laird has experience designing both systems, and can integrate many
unique attributes into an LCS, such as:
•
•
•
•
•
•
•
•
•
Cooling capacity (up to 200 KW)
Variable pump capacity
Thermal control of multiple liquid circuits
Coolant filtration
Variable flow control
PID temperature control
High temperature stability
High Coefficient of Performance
Durability by hot gas bypass control
•
•
•
•
•
•
•
•
CFC-free refrigerants
Stainless steel heat exchanger
High operational temperatures
Flow monitoring
Level switching
Fault signal potential-free
Maximum pressure limit
Custom input/output fittings and
housing configuration
Laird offers strong engineering services with a global presence that supports onsite concept generation, thermal modeling,
flow analysis, mechanical design, electrical design and rapid prototyping. Vertical integration is fundamental to meet the
needs of today’s fast product development cycles. Laird has invested in sheet
metal fabrication, spot welding, tube bending and CNC equipment. Our engineering team also works with world-class
suppliers to utilize their expertise in supporting custom designs on pumps, compressor technologies, evaporators and
liquid heat exchangers.
Validation test services are also available to support compliance standards for each industry, such as UL/CSA and MIL-STDs.
In-house test capabilities exist to support:
•
•
•
•
•
Noise measurement
Cooling capacity
Pressure and flow rates
Electronic drive circuit testing
Reliability testing
•
•
•
•
G-force testing
High temp oven storage testing
Temperature cycling
Continuous operation testing
All products are manufactured in an ISO 9001 and ISO 14001 certified facility and are built to meet the needs
of strict process control requirements found in many of the medical, industrial and semiconductor industries.
All parts are procured from premium suppliers with a proven history of supplying high reliable components.
Laird also offers strong service support to repair or replace parts on units that have been in the
field for more than two decades.
Laird provides the knowledge, innovation, and resources to ensure exceptional thermal performance
and customer satisfaction. Contact us today for your complete application solutions.
www.lairdtech.com
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