A coolant distribution unit (CDU) is a key component of data center liquid cooling systems that manages the circulation, temperature, and pressure of coolant delivered to IT equipment. Acting as the bridge between facility cooling infrastructure and liquid-cooled servers, a CDU removes heat from high-density equipment and ensures stable, efficient operations.
As data center power densities increase beyond the limits of traditional air cooling, CDUs play a critical role in enabling more efficient thermal management and supporting next-generation liquid cooling systems.
What a Coolant Distribution Unit Does
A CDU regulates and distributes coolant throughout a liquid cooling system, including:
- Circulating coolant to manifolds, racks, or direct-to-chip systems
- Transferring heat from IT equipment to a facility cooling loop via a heat exchanger
- Controlling coolant temperature, pressure, and flow rate
- Monitoring system performance with sensors for temperature, flow, and pressure
- Isolating facility water from IT cooling loops to maintain fluid quality
Benefits of Coolant Distribution Units
- Improved cooling efficiency. Liquid cooling with CDUs removes heat more effectively than air, especially in high-density environments.
- Support for high-density workloads. CDUs enable the deployment of AI, HPC, and other power-intensive applications.
- Precise temperature control. Consistent regulation and monitoring of coolant flow and temperature levels ensure stable equipment operation.
- Reduced energy costs. Leveraging CDUs can increase heat transfer efficiency and lower the overall cooling energy requirements and ultimate costs.
Track and Manage Coolant Distribution Units with DCIM Software
Data Center Infrastructure Management (DCIM) software provides the visibility needed to track and model CDUs as a critical part of the liquid cooling infrastructure. By creating a digital twin of these assets and their relationships, DCIM software helps operators manage the transition from facility cooling to the IT equipment.
Key capabilities include:
- Asset and relationship management. Create CDU items, place them in cabinets, and model their relationships to the broader cooling infrastructure. Gain visibility into the supporting infrastructure for liquid-cooled compute equipment, such as GPUs.
- High-fidelity digital twin. Capture a complete and accurate digital representation of the CDU.
- Impact analysis. Perform faster and easier impact analysis on deployments by understanding how CDUs are connected to the cooling loop.
- Deployment planning. Use modeled data to plan and manage new deployments that require liquid cooling support.
Want to see how Sunbird’s industry-leading DCIM software helps you monitor and optimize liquid cooling infrastructure, including CDUs? Get your free test drive now!