HX · Heat Exchanger
The plate or coil that passes heat between two fluid streams without mixing them, as in a CDU, a rear door or a heat-reuse loop. Its approach temperature decides how much temperature each handoff costs.
Current numbers
~99.999%Google fleet-wide CDU availability since 2020 (redundant pump+HX, UPS-backed)
30–40 kW typical RDHx; >50 kW with active fansRear-door heat exchanger capacity SemiAnalysis reports (Feb 2025): 30–40 kW typical, >50 kW with active door fans