ACS Door HX sub-project update
Author: Juan Carlos, Retal; Jabari George, GM (cross-engineering) Collection: 2023 Global Summit - Cooling Environments
Summary
Juan Carlos (Retal) and Jabari George present the annual update for the OCP Door Heat Exchanger (Door HX) sub-project, part of the Advanced Cooling Facilities (ACS/ACF) work stream. The sub-project aims to provide documentation and product information to the broader community, harmonize with partner OCP sub-projects, reduce the barrier to liquid cooling adoption, and establish standard approaches for deploying rear door heat exchangers across different rack architectures (Open Rack, EIA310) and facility types (facility water-equipped, free air-cooled).
The 2023 update covers four major effort areas: (1) A completed white paper comparing a reference door heat exchanger with an improved customized design showing significantly increased power capacity and reduced approach temperatures with only minor size increases; (2) An ongoing collaboration with the Modular Data Center (MDC) sub-project to explore boosting MDC capacity to 500 kW and beyond using hybrid cooling (cold plate + door HX); (3) An aluminum microchannel heat exchanger (AL MCHE) whitepaper in progress, in partnership with Danfoss, Boyd, and Meta — applying automotive/HVAC-proven microchannel technology to door HX for potential space/weight/cost improvements; (4) A Meta-originated Facility Door HX concept that inverts the conventional architecture by moving the door HX frame to the facility rather than the IT rack, with a prototype on display at the summit Experience Center.
Near-future work includes a new project on rack-to-door HX mechanical and hydraulic connections (how to connect the door from top or bottom, left or right hinge side, manifold placement, and coupling types including 48V DC power for active door HX via DC busbar). The Door HX requirements document (Rev 1) needs updating to reference current ASHRAE water standards (W7 replaces W1/W2 etc.) and to address ORv3 blind mate manifold integration geometry.
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