DLC 150 L2L 4U in-rack coolant distribution unit

Rack-Mounted Coolant Distribution

In-Rack CDU

Compact 4U rack-mounted coolant distribution unit for AI and HPC cabinets with redundant pumping, monitoring, and remote communication interfaces.

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Product Overview

High-capacity liquid cooling in a compact 4U footprint.

The in-rack CDU is designed for high-density compute racks where cooling capacity, loop cleanliness, service access, and floor-space efficiency all matter. Plate heat exchangers isolate the primary and secondary loops, while the secondary loop maintains stable coolant delivery for cold-plate equipment.

4U Form Factor

Fits inside compatible 21-inch rack architectures to reduce external equipment footprint.

150 kW Class

Rated at 150 kW at 4 C ATD and 193 kW at 6 C ATD for dense AI and HPC loads.

N+1 Pumps

Variable-speed high-efficiency pump drive with N+1 redundancy for continued operation planning.

Smart Monitoring

Online monitoring for temperature, pressure, flow, humidity, leakage, and operating status.

DLC 150 L2L Specs

Power	DC 48V
Cooling capacity	150 kW @ 4 C ATD / 193 kW @ 6 C ATD
Nominal power	1.6 kW / 2.1 HP
Operating pressure	8 bar / 116.03 psi
External residual pressure	1.2 bar / 17.4 psi
Primary temperature	36/48 C / 96.8/118.4 F
Secondary temperature	40/52 C / 104/125.6 F
Primary flow	10.9 m3/h / 48 GPM using 25% PG
Secondary flow	11.4 m3/h / 50.2 GPM
Connections	1 in. TriClamp fittings, primary and secondary
Coolant	Primary cooling water; secondary PG25
Dimensions	536 x 950 x 177 mm / 21.1 x 37.4 x 7 in.

Control Architecture

Closed secondary loop control for dense compute racks.

Loop Isolation

Plate heat exchangers separate primary and secondary loops to protect coolant quality and IT-side operation.

Stable Control

Secondary loop temperature can be controlled within +/-1 C for predictable rack-side supply conditions.

Remote Interface

Local touchscreen plus Modbus-RTU/TCP and SNMP communication for monitoring and integration.

Modular Anatomy & Field Integration

Factory-integrated modules simplify service and rack deployment.

The 4U platform combines the thermal core, N+1 pump module, monitoring, and pressure stabilization in a serviceable rack-mounted assembly. Final interfaces are confirmed during engineering review.

Thermal Core

Plate heat exchange isolates the facility loop from the clean IT-side secondary loop.

N+1 Pump Module

Variable-speed pumps follow dynamic cooling demand while supporting redundancy planning.

Sensor & Controls

Temperature, pressure, flow, humidity, and leakage data support alarms and protective actions.

Deployment Fit

For AI training racks, HPC clusters, and space-limited upgrades.

In-rack CDU deployment is well suited where rack-level cooling control is preferred over larger centralized CDU cabinets, or where each rack group needs a compact, serviceable distribution unit close to the load.

Five populated liquid-cooled racks with in-rack CDU deployment

About JR Cooling Technologies

Engineering Excellence. Global Capability.

Advanced engineering, manufacturing, and validation for liquid cooling solutions worldwide.

18Years of Engineering

4Laboratories

81Chinese Patents

20Software Copyrights

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