Refined Heat Exchanger (RDHx)
Neurair’s Rear Door Heat Exchanger (RDHx) uses liquid-to-air cooling to capture and remove server heat directly at the rack. By preventing hot air from entering the data hall, RDHx helps maintain ideal facility temperatures — typically around 19°C or 27°C, following EU data center standards.
As a widely adopted solution, RDHx integrates seamlessly with liquid cooling systems like CDUs, reducing the burden on traditional AC systems, cutting energy costs, and enabling efficient high-density deployments.
Advantages
Direct Heat Removal at the Rack
Fanless, Low-Maintenance Design
Energy and Cost Savings
RDHx captures and cools exhaust air immediately as it exits the server, preventing heat buildup in the room and improving thermal compliance.
With no internal fans or motors, RDHx offers quiet, maintenance-free operation, making it ideal for high-reliability environments.
By reducing the need for room-level AC, RDHx lowers energy consumption and operating costs—while maintaining performance under high-density workloads.
Why We Need RDHx
As compute power and rack density grow, traditional cooling methods struggle to keep up—especially when dealing with back-of-rack heat discharge. RDHx captures heat directly at the source, eliminating hot air from entering the data hall and reducing the overall cooling burden.
It’s an ideal solution for data centers looking to enhance thermal efficiency without major mechanical changes. With its passive operation and minimal footprint, RDHx supports sustainability and lowers total energy use.
Stop Heat at the Source
RDHx removes hot exhaust air right at the rack, keeping the data hall cool and improving system reliability.
Passive, Efficient, Proven
With no fans or moving parts, RDHx delivers quiet, energy-efficient cooling trusted in production deployments worldwide.
How it works?
Cooling Directly at the Rack’s Exhaust
RDHx units mount on the rear of server racks, capturing heat as it exits the servers using liquid-cooled coils.
Liquid-to-Air Heat Exchange
Circulating coolant absorbs exhaust heat and transfers it via liquid lines to a CDU, chiller, or economizer.
Maintains Facility Ambient Temperatures
Prevents hot air recirculation, improving efficiency of HVAC and maintaining stable aisle temperatures.
Ideal for Retrofitting
RDHx units upgrade traditional air-cooled racks into high-efficiency cooling systems without structural overhaul.
Standards-Aligned
Complies with EU and ASHRAE thermal guidelines—typically maintaining 19°C to 27°C rack outlet temps.