RDx (Rear Door Cooling)RDx (Rear Door Cooling) is an efficient cooling solution for data centers, where a heat exchanger is mounted on the back of server racks to remove heat directly from the source. By cooling the hot air before it enters the data center room, RDx reduces the overall load on traditional cooling systems like CRAC (Computer Room Air Conditioning) units.

There are several RDx technologies:

• Passive Rear Door Cooling: Heat exchangers without fans rely on the airflow generated by the server equipment. They are energy-efficient but may be less effective in high-density environments.

• Active Rear Door Cooling: These systems incorporate fans to enhance airflow across the heat exchanger, providing more effective cooling for high-density racks.

RDx solutions can significantly lower energy consumption and PUE by reducing the reliance on room-wide cooling systems and improving localized heat management.

1. Localized Cooling

RDx cools air directly at the heat source (server racks), whereas traditional air cooling circulates air throughout the entire data center. By removing heat at the rear door, RDx prevents hot air from mixing with the room’s ambient air, reducing the overall cooling demand on the facility.

2. Energy Efficiency

RDx systems reduce the need for powerful air conditioners, such as CRAC units, which consume significant energy to maintain appropriate temperatures in the data center. Since RDx cools only the hot air emitted from servers, it operates more efficiently, leading to lower energy costs and reduced Power Usage Effectiveness (PUE).