Blogs

42U Is No Longer the Default: The Rise of 48U and Custom Racks

Why Roof Design Matters in Outdoor Enclosures

What Happens to an Enclosure After 10,000 Door Cycles?

The Engineering Behind BESS Container Layout

Why Internal Equipment Placement Makes or Breaks Reliability

Why Rack Doors Can Become an Airflow Restriction in High-Density Data Centers

The Role of Busbar Design in High-Power BESS Systems

RDHx vs CDU: What's the Difference—and Why You Need BothUnderstanding the Backbone of Modern Liquid Cooling Infrastructure As AI workloads, HPC clusters, and next-generation data centers push rack densities beyond 30–100+ kW, traditional air cooling is approaching its practical limits. Liquid cooling has become the preferred solution—but many professionals still use RDHx and CDU interchangeably. They are not the same thing. One removes heat from the servers. The other enables the entire cooling ecosystem to function. Understanding how they work together is essential when designing high-density IT infrastructure. The Shift from Air to Liquid A conventional server room relies on Computer Room Air Conditioning (CRAC) units and raised-floor airflow. This works well for low to medium density deployments. However, AI GPUs, accelerated computing, and HPC applications generate heat concentrations that air simply cannot remove efficiently. This is where liquid cooling changes the game. Instead of cooling the room first, heat is removed directly at—or very close to—the source. The two key components enabling this are: Rear Door Heat Exchangers (RDHx) Coolant Distribution Units (CDU) Although closely related, they perform completely different functions. What is an RDHx? A Rear Door Heat Exchanger (RDHx) is mounted on the rear of an IT rack. Instead of allowing hot exhaust air to enter the data hall, it passes through a chilled-water heat exchanger integrated into the rear door. The hot air transfers its heat into the water, and the cooled air exits back into the room. In simple terms: Server → Hot Air → RDHx → Heat Removed → Cool Air Returned Key Benefits Supports rack densities up to 80–100+ kW Minimal changes to existing server hardware Maintains familiar air-cooled server architecture Reduces dependence on CRAC units Improves overall cooling efficiency RDHx is often the preferred first step toward liquid cooling because it requires minimal changes to existing IT equipment. What is a CDU? A Coolant Distribution Unit (CDU) is the hydraulic control center of a liquid cooling system. Rather than cooling servers directly, it manages the coolant circulating through RDHx units or direct liquid cooling loops. A CDU typically: Pumps coolant Controls pressure Maintains flow rates Regulates supply temperatures Isolates facility water from IT cooling loops Monitors system health Think of the CDU as the heart that keeps coolant flowing throughout the cooling infrastructure. Without a CDU, liquid cooling cannot operate reliably.

Engineering Change Management: The Biggest Challenge in Contract Manufacturing

Solar ACDBs: The Most Underrated Protection Layer in Solar Power Systems

Why Electrical Rooms Are Becoming More Valuable Than White Space in AI Data Centers

Why Smart BESS Design Starts with Internal Segregation

The Hidden Engineering Behind Perfect Panel Door Alignment: Why Millimeters Matter in Industrial Enclosures

How Vibration Silently Destroys Electrical Infrastructure Over Time

The Risk of Improper Fastener Selection in Electrical Panels

Cable Entry Chaos: The Problem with Standard Gland Plates in High-Density Panels

Panel Transportation & Handling — The Hidden Damage Phase

Bolted vs Welded Busbars: Serviceability or Structural Integrity?

The Redundancy Myth: How A+B Power Systems Still Hide Critical Single Points of Failure in Data Centers

IP Rating vs IK Rating — The Overlooked Mechanical Protection Gap

The Myth of “Form 4” Safety in LV Switchboards

Busbar Support Insulators: The Hidden Conflict Between Mechanical Strength and Electrical Design

Beyond Static Ratings: Designing Battery Racks for Seismic Safety

The Science Behind Flameproof Joint Gap Tolerances (Ex d)

The Forgotten Role of Earthing in System Reliability

The Hidden Lifecycle Mismatch Problem in Electrical Infrastructure (And Why It’s Costing You More Than You Think)