RDHx · Rear-Door Heat Exchanger
A liquid-cooled rack door removing ~50-100 kW without piping liquid to the chips; a brownfield step toward full DLC.
A radiator-style door on the back of a rack that cools exhaust air with liquid before it enters the room.
Also written as: Rear-Door Heat Exchanger
Current numbers
~50–120 kWactive RDHx capacity per rack — newest high-capacity doors reach ~100 kW; Motivair ChilledDoor rated to ~75 kW at 100% heat capture
~10–30 kW typical; to ~50 kW on current productpassive RDHx capacity per rack (server fans only, zero added fan power)
10–100 kWRDHx capacity per rack (passive ~15–30 kW; active ~50–100 kW); ~$8–15k/rack