Liquid cooling system EXT-CDU35LR

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Overview
The EXTRCOOL Rack-Mounted Liquid-to-Liquid (L2L) Cooling Distribution Unit is a compact, standard 4U rack-mountable CDU purpose-built for high-density liquid cooling deployments in AI and HPC data centers. Designed to pair with NVIDIA GB200/GB300 and next‑generation GPU servers, this unit enables efficient heat transfer between server cold‑plate loops and facility chilled water systems, supporting rack power densities up to 100 kW and beyond.

Key Feature Headline
4U Rack-Mountable Liquid-to-Liquid Cooling Distribution Unit for High-Density Liquid Cooling Loops

Core Technical Advantages

• Compact Rack-Mount Form Factor: Standard 4U rack design fits directly into server racks, eliminating the need for dedicated floor space and simplifying integration with facility chilled water networks.
• Efficient Liquid-to-Liquid Heat Exchange: High-performance plate heat exchangers transfer waste heat from server loops to chilled water systems, supporting high heat loads for dense AI clusters.
• Integrated Monitoring & Control: Front-mounted touchscreen HMI with real-time temperature, flow, and pressure monitoring; supports remote management and BMS integration.
• Plug-and-Play Deployment: Pre-configured piping, pumps, and sensors enable rapid connection to server manifolds and facility chilled water, minimizing commissioning time.
• Leak‑Resistant, Enterprise-Grade Design: Reinforced connections and factory pressure-tested components ensure reliable 24/7 operation for mission-critical workloads.

Product Specifications (table representation)
Attribute: Specification
Brand: EXTRCOOL
Model Series: CDU-L2L Rack Series
Cooling Type: Liquid-to-Liquid (L2L) chilled water heat exchange
Product Category: Rack-Mounted Cooling Distribution Unit (CDU)
Form Factor: 4U standard rack
Compatible Systems: Server cold plate loops, chilled water networks
Place of Origin: Guangdong, China

Model Number options: EXT-CDU35LR; EXT-CDU50LR; EXT-CDU100LR; EXT-CDU120LR; EXT-CDU150LR; EXT-CDU200LR; EXT-CDU250LR
Installation Type: In-rack
Rated cooling capacity (by model): 35 kW; 50 kW; 100 kW; 120 kW; 150 kW; 200 kW; 250 kW
Coolant: PG25
Working environment (T & H): -10°C ~ 55°C / RH 5~90%
Storage environment (T & H): -45°C ~ 70°C / RH 5~93%
Display: 4.3" (smaller models) or 7" (larger models)
Approach temperature: 5°C
Primary side temp. (in/out): 35°C / 45°C
Secondary side liquid temp. (out/in): typical 40°C/45°C or 40°C/50°C depending on model
Secondary side rated flow rate (by model): 120 LPM; 160 LPM; 160 LPM; 190 LPM; 240 LPM; 320 LPM; 400 LPM
Power Supply: AC220V 50/60Hz (some models support 3P AC380V 50/60Hz or 3P AC480V 60Hz)
Dual power ATS: Yes
Leak Detection: Yes
Redundant Pump Automatic Switchover: 1+1
Power consumption (by model): <0.8 kW; <0.8 kW; <0.8 kW; <1 kW; <2.5 kW; <2.8 kW; <3 kW
Bypass Online Replaceable Filter: No
Control type: PID control, adjusts flow rate according to temperature
Communication: Modbus RTU & TCP/IP
Approx. Weight (by model): 50 kg; 65 kg; 75 kg; 85 kg; 80 kg; 100 kg; 110 kg
Protection level: IP55
Dimensions (W x D x H) mm (by model): 482 x 870 x 177.8; 482 x 870 x 177.8; 482 x 870 x 177.8; 482 x 870 x 217.2; 482 x 870 x 217.2; 482 x 870 x 265; 482 x 870 x 265

Ideal Application Scenarios

• Large-Scale AI Data Centers: Supports high-density liquid cooling deployments for GB200/GB300 GPU clusters.
• HPC & Supercomputing Facilities: Delivers reliable cooling for scientific computing and engineering simulation workloads.
• New-Build Liquid Cooling Data Centers: Optimized for facilities with existing chilled water infrastructure.
• Ultra-High Power Density Racks: Supports 50 kW+ rack loads for next-generation AI servers.
• Modular Liquid Cooling Architectures: Ideal for scalable, incremental cooling deployments.

Why Choose EXTRCOOL Rack-Mounted L2L CDU?
The rack-mount form factor minimizes floor footprint while delivering high-capacity heat rejection. EXTRCOOL's L2L CDU integrates efficient plate heat exchangers, monitoring, and factory-configured piping to simplify installation and operation for mission-critical AI and HPC workloads, helping maintain stable, energy-efficient performance year-round.

Frequently Asked Questions
1. What is a rack-mounted L2L CDU used for?
A rack-mounted L2L CDU transfers waste heat from server liquid cooling loops to facility chilled water systems in a compact rack form factor, ideal for space-constrained data centers with chilled water infrastructure.

2. What are the benefits of a rack-mounted vs. standalone L2L CDU?
The rack-mount design fits directly into server racks, reduces piping complexity, eliminates dedicated floor space needs, and is factory-pretested to reduce on-site commissioning time.

3. Is the unit compatible with standard chilled water systems?
The rack-mounted L2L CDU supports common chilled water pressures and temperatures and offers customizable connections to match most facility chilled water networks.

Technical specifications

• Brand: EXTRCOOL
• Model Series: CDU-L2L Rack Series
• Form Factor: 4U rack-mount
• Cooling Type: Liquid-to-Liquid (L2L) chilled water heat exchange
• Rated cooling capacity: 35 kW–250 kW (model dependent)
• Coolant: PG25
• Secondary side flow rate: 120–400 LPM (model dependent)
• Control: PID, Modbus RTU & TCP/IP communication
• Redundancy: 1+1 pump switchover, dual power ATS
• Leak detection: Yes
• Protection: IP55
• Approx. weight: 50–110 kg (model dependent)
• Dimensions (W x D x H): 482 x 870 x 177.8 / 217.2 / 265 mm (model dependent)