Download document () of 20
We make what matters work*
Liquid cooling systems

Coolant distribution unit (CDU)

Eaton Boyd Thermal CDUs lower data center total cost of ownership and energy demand. Right-sized and custom configured CDUs for specific applications mean hyperscale compute systems get the exact, optimal cooling performance the system needs, when it needs it in data centers that are more environmentally sustainable.

What is a coolant distribution unit (CDU)?

Coolant distribution units, also called cooling distribution units, are devices used in cooling systems to distribute coolant, such as water or other fluids, to different parts of a machine or process that require cooling. They are typically found in large cooling systems that need to regulate temperature in a variety of different components.

What does a coolant distribution unit do?

Coolant distribution units are essential components that ensure liquid cooled systems meet or exceed lifetime expectations. Operation logic integrated into intelligent controllers combined with smart controls manage server and data center cooling system performance. Smart controls respond to peak demands while remaining economical and efficient during non-peak operation and prevent problems before they occur. Blind mate quick disconnects with 360 swivel fittings make servicing data center cooling systems fast to minimize maintenance downtime.

Enterprise coolant distribution units

Eaton cooling distribution

ROL4000-48U65

Inspired by the Open Compute Project (OCP) Project Deschutes fifth generation specifications, the Eaton Boyd Thermal ROL4000 unit combines performance, reliability and serviceability into a single liquid-to-liquid cooling system for in-row configurations.

Eaton rol byod

ROL2300-48U40

The Eaton Boyd Thermal ROL2300 high-capacity data center cooling system is designed to deliver efficient thermal management by leveraging facility water in an in-row cooling configuration. The ROL2300 unit has a cooling capacity range up to 2.3 MW to support multiple server racks.

Eaton rol

ROL1100-48U32

The Eaton Boyd Thermal ROL1100 unit provides effective data center cooling capability by utilizing facility water within an in-row configuration. It has a cooling capacity range of 550 kW to 1100 kW with typical approach temperatures to support multiple server racks.

Eaton ral

RAL110-04U19

The Eaton Boyd Thermal 4U liquid-to-liquid Cooling Distribution Unit is a state-of-the-art cooling system that maximizes cooling capability in its given volume. The 4U CDU unit has a capacity of up to 110 kW depending on heat load and approach temperature requirement.

Eaton boyd

RAA32-10U2

Boyd’s 10U Liquid-to-Air CDU is an effective system to provide liquid cooling to high-power computing in a data center or edge servers where facility water is unavailable. Depending on heat load and temperature requirements, Boyd’s 10U CDU has a capacity up to 32 kW.

Eaton boyd cooling

RAA22-10U19

The Eaton Boyd Thermal 10U liquid-to-air Cooling Distribution Unit is an advanced cooling system that maximizes cooling capability in its given volume. The 10U CDU unit has a capacity of up to 22 kW depending on heat load and approach temperature requirement.

Lifetime CDU support

Learn more about Eaton's CDU services and warranty options

Eaton boyd cdu

How does a coolant distribution unit work?

A coolant distribution unit contains a pump that circulates coolant through a network of pipes or channels, distributing it to various components like servers, processors or other high heat components in large, high-power devices that need cooling. CDUs may also contain valves, filters and other components to control and monitor coolant flow.

Why use a coolant distribution unit?

As computing chip power increases, liquid cooling becomes the necessary cooling technology to replace conventional air cooling. Eaton Boyd Thermal CDUs are advanced cooling systems that maximize cooling capability with greater power and compute density in given volume with more energy efficiency. A liquid-cooled server negates the need for bulky heat sinks and loud fan trays in data center cooling systems that create significant environmental noise pollution and consume more energy, so CDUs remove excessive noise and vibration from data centers to improve data integrity and data center workplace safety, while reducing energy use. CDUs increase IT equipment’s safe packaging density into a rack.

Eaton black In rack liquid to air coolant distribution
Eaton boyd rack cdu

Coolant distribution unit challenges

Liquid cooling provides responsive, high-capacity cooling, but comes with additional design and project challenges. From leak-proofing, additional capital expense, installation and training costs, system architects must weigh performance and sustainability benefits against these project requirements above air cooling. Eaton Boyd Thermal coolant distribution units are designed and manufactured to mitigate potential risk to enable the fullest benefit of liquid cooling.

 

Full liquid cooling systems: Integrating CDUs with other thermal technologies

Integrate CDUs in server rack cooling systems with cold plates custom designed to maximize interface with CPUs and GPUs through machined custom geometries and skylines for maximum heat transfer to the liquid cooling system. Leverage high reliability manifolds to safely direct liquid throughout a server rack.

Eaton cdu front
Eaton cdu

Denser processing or smaller equipment with reliable Eaton Boyd Thermal CDUs

Flexibility and space-saving benefits may enable data center and server rack designers to completely rethink footprint configuration opportunities to maximize power density. Eaton Boyd Thermal CDUs are designed to meet IEC62368-1 and tested to withstand 3X maximum working pressure. All new subcomponent designs undergo harsh maximum pressure testing to destruction to ensure reliable data and server cooling systems. Reliability testing incudes thermal cycling, min/max storage, and packaging testing.

Eaton Boyd Thermal coolant distribution unit flexibility and space-saving benefits

In a server cooling system, integrated CDUs enable greater processing power density meaning more servers can fit in each data center rack. Integrate CDUs directly into facility water or facility-level cooling systems for direct rack server cooling or design self-contained cooling that offers the next level of flexibility for liquid cooled servers. Leverage CDU cooling capacity to cool the rack, chassis, blade, or even down to the processor or silicon. CDUs can be designed to integrate into existing data center or chassis configurations and infrastructure.
Eaton rack emulator

Verify coolant distribution performance prior to IT equipment startup with the Eaton Boyd Thermal rack emulator

Test coolant distribution unit operation with a rack emulator to ensure safe and efficient liquid cooling operation through start up without damaging expensive IT equipment. The emulator is programmable and flexible to simulate any rack. Connect to the liquid cooling system and input both heat load capacity and pressure drop protocols, and the rack emulator operates like a rack, simulating its operating characteristics.

Eaton liquid cooling
Eaton ocp inspired

ROL4000-48U65

The Eaton Boyd Thermal ROL4000-48U65 in-row liquid-to-liquid coolant distribution unit enables cooling for the next generation of AI processors in high density data center installations. With 2 MW of cooling at a 3° C approach temperature, this CDU boosts energy efficiency by reducing facility cooling requirements. The ROL4000 unit was developed with next generation TCS loops in mind by providing up to 80 PSI of available pressure to drive flow though high-performance cold plate loops, control valves and other components.

Maximize your overall uptime with the ROL4000 unit's reduced maintenance requirements and longer lifetimes, supported by seal-less N+1 pumps, fully redundant power feeds for each pump circuit and 0.2 micron side stream filtration.

Additional features for the ROL4000 unit include:

  • 500 GPM (1890 LPM) TCS flow rate with PG25
  • IEEE 519 ULHD variable frequency drives keeping power clean
  • 230 VAC convenience port for fill cart for ease of service

Inspired by OCP’s fifth generation Project Deschutes CDU specification, the ROL4000-48U65 unit combines performance, reliability, lifetime and serviceability into a single unit. Quickly upgrade your installation with Eaton's streamlined design and global service team with decades of experience commissioning direct-to-chip liquid cooling systems.

Inspired by OCP’s fifth generation Project Deschutes CDU specification, the ROL4000-48U65 combines performance, reliability, lifetime, and serviceability into a single unit.

ROL4000 key specifications

Liquid-to-liquid cooling distribution units (L2L CDU)

High-impact cooling with facility water

Liquid-to-liquid CDUs require facility water to remove heat from rack and row equipment but come with a battery of benefits to offset added system complexity. Fully liquid cooled data centers maximize energy efficiency from the higher heat capacity of liquid throughout the full data center. These liquid cooling systems enable smaller footprints and lower total cost of ownership, ideal for artificial intelligence and advanced analytics, blockchain and cryptocurrency, mainframe and gaming servers, and supercomputer applications.

Eaton boyd server cooling

Liquid-to-air cooling distribution units (L2A CDU)

Eaton boyd coolant distribution

Self-contained liquid cooling systems

Many facilities are not designed for system-wide liquid cooling, so liquid-to-air Coolant Distribution Units provide the benefits of liquid cooling without the full-scale implementation of facility water. L2A CDUs leverage data center air conditioning to dissipate heat from the server rack or row to enable localized liquid cooling for high output IT equipment. Liquid-to-air CDUs maximize possible cooling in established air-cooled data centers, minimize thermal management equipment and installation costs and cool at higher capacity than air alone would offer.

In-rack coolant distribution units

Optimized to efficiently and seamlessly integrate into a high-power device

In-rack CDUs are optimized to efficiently and seamlessly integrate into a large, high-power device like a data center server chassis or medical imaging equipment. In-fack CDUs are configured in standard 2U and 4U cloud data center server configurations or common dimensions across standard medical and industrial models.

Designed for maximum performance and efficient installation or maintenance

Server rack cooling is easy to use with CDU installation instructions as simple as completing the liquid loop, filling the liquid reservoir tank and flipping the switch. These systems offer a fast option to upgrade to liquid cooling in a cost effective and reliable package and can be fully self-contained or integrated into available facility cooling systems.

Eaton cdu side
Eaton cdu

In-row cooling for greater power and compute density

In-row CDUs are full rack-sized Coolant Distribution Units installed alongside a row of server racks to provide efficient data center cooling. In-row CDUs circulate coolant in a closed loop system on the secondary, cooling side and utilize facility water on the primary, heat rejection side.  In-Row CDU cooling capacity is on the scale of 600-800KW, enough heat dissipation to cool 5-6 high power server racks.

Specifications

Eaton Boyd Thermal enterprise cooling distribution units

Configuration

Model number

Cooling capacity @ ATD

Cooling capacity @ ATD

Flow rate

Dimensions WxLxH

Row - L2L ROL4000-48U65 2000 kW @ 3°C - 500 GPM (1890 LPM) 1651 mm x 1199 mm x 2364 mm (65.0 in x 47.2 in x 93.1 in)
Row - L2L ROL2300-48U40 1150kW @ 4°C 2300kW @ 8°C 400 GPM @ 55 psi 1016 mm x 1219 mm x 2134 mm
(40.0 in x 48.0 in x 84.0 in) 
Row - L2L ROL1100-48U32 1100 kW @ 8°C 550kW @ 4°C 125 GPM @ 30 psi
473 LPM @ 2.1 Bar
800 mm x 1205 mm x 2147 mm
(31.5 in x 47.4 in x 84.5 in)
Rack - L2L RAL110-04U19 110 kW @ 12°C 50 kW @ 6°C 24 GPM @ 10 psi
90 LPM @ 0.7 bar
450 mm x 966 mm x 175 mm
(17.7 in x 38.0 in x 6.9 in)
Rack - L2A RAA32-10U21 32 kW @ 24°C 16 kW @ 12°C 16 GPM @ 12 psi
60 LPM @ 0.8 bar
538 mm x 982 mm x 440 mm
(21.2 in x 38.7 in x 17.3 in)
Rack - L2A RAA22-10U19 replaces
RAA15-10U19
22 kW @ 24°C - Up to 50 LPM 445mm x 850mm x 443mm
(17.5 in x 33.4 in x 17.4 in)

ROL4000 key specifications

Configuration Model number Cooling capacity @ ATD Available flow rate Available pressure
Row - L2L ROL4000-48U65 2000 kW @ 3°C 500 GPM (1890 LPM) 80 PSI

Eaton Boyd Thermal industrial cooling distribution units

System  Type  Nominal cooling capacity  Standard process temp.  Temperature stability  Ambient temperature range  Dimensions (L x W x H)  Datasheet 
MCS20 – Stand Alone  Liquid to Air  1.3 kW   55°C
(131°F)max 
   15.5°C to 27°C
(60°F to 80°F) 
439 x 384 x 338mm
(17.3 x 15.1 x 13.3in) 
 MCS20 Datasheet
MCS30 – Stand Alone  Liquid to Air  2.1 kW    55°C
(131°F)max 
   15.5°C to 27°C
(60°F to 80°F) 
 439 x 384 x 338mm 
(17.3 x 15.1 x 13.3in) 
MCS30 Datasheet
MCS40 – Stand Alone  Liquid to Air  2.4 kW   55°C
(131°F)max 
   5°C to 40°C
(41° to 104°F) 
381 x 381 x 610mm 
(15 x 15 x 24in) 
MCS40 Datasheet
MCS50 – Stand Alone  Liquid to Air  3.5 kW   55°C
(131°F)max 
  5°C to 40°C
(41° to 104°F) 
381 x 381 x 610mm
(15 x 15 x 24in) 
MCS50 Datasheet
LCS20  Liquid to Liquid  20 kW  10°C to 60°C  +/- 0.5 °C  5°C to 40°C
(41°F to 104°F) 
543 x 705 x 810mm 
(21.4 x 27.8 x 31.9in)