Coolant Distribution Unit

# Coolant Distribution Unit **Entity class:** Concept or analytic term **Domain:** Thermal Engineering / Data Centers **Doc Type:** Technical Interface Node **Maturity:** Developed ## Definition A **coolant distribution unit** is the hydraulic and control interface that transfers heat between a facility cooling loop and a technology cooling loop while regulating flow, pressure, temperature, isolation and monitoring. ## Governing Variable The CDU governs the thermal-fluid boundary between building infrastructure and liquid-cooled information technology. ## Material and Computational Manifestation Heat exchangers, pumps, valves, filters, sensors, controls, alarms and leak-management functions make the interface operational. The CDU may serve one rack, several racks or a larger cooling domain depending on design. ## Relation to Governance The unit dissolves the old assumption that a server is thermally self-contained. It makes facility state a direct precondition of rack-scale computation and creates a clear target for [[wiki/Telemetry|telemetry]], maintenance and standardization. ## Constitutional Question and Failure Modes Who can change setpoints, how local equipment fails safely and whether operators can service the unit without proprietary dependency are operational-governance questions. Failure modes include pump loss, cross-contamination, control oscillation and a shared CDU becoming a common-mode failure domain. ## Related Ontology [[wiki/Direct-to-Chip Liquid Cooling|Direct-to-Chip Liquid Cooling]] · [[wiki/Thermal Architecture|Thermal Architecture]] · [[wiki/Rack-Scale Computing|Rack-Scale Computing]] · [[wiki/Facility Digital Twin|Facility Digital Twin]] ## Relationships  This entry is routed through [[collections/Consciousness Continuity|Consciousness Continuity]], [[collections/Neurotech|Neurotech]], and [[collections/Machine Succession|Machine Succession]]. Its source context is developed in [[articles/Mind Uploading and AI — The Host is Reusable and the Person is the Delta|Mind Uploading and AI — The Host is Reusable and the Person is the Delta]] and [[articles/Technologies for Consciousness Mapping and Transfer|Technologies for Consciousness Mapping and Transfer]]. Status-qualified source edges are preserved in the terminal Research Edges section.  ## Read First in the Wiki  - [[wiki/Direct-to-Chip Liquid Cooling|Direct-to-Chip Liquid Cooling]] — supplies the related concept or analytic term context needed to place **Coolant Distribution Unit** within the wider system. - [[wiki/Facility Digital Twin|Facility Digital Twin]] — supplies the related concept or analytic term context needed to place **Coolant Distribution Unit** within the wider system. - [[wiki/Rack-Scale Computing|Rack-Scale Computing]] — supplies the related concept or analytic term context needed to place **Coolant Distribution Unit** within the wider system. - [[wiki/Thermal Architecture|Thermal Architecture]] — supplies the related technology, method, or technical system context needed to place **Coolant Distribution Unit** within the wider system.  ## Research Edges  #### Host–residual infrastructure patch — 2026-09-10 **Collections:** [[collections/Consciousness Continuity|Consciousness Continuity]] · [[collections/Neurotech|Neurotech]] · [[collections/Machine Succession|Machine Succession]] **Canonical source article:** [[articles/Mind Uploading and AI — The Host is Reusable and the Person is the Delta|Mind Uploading and AI — The Host is Reusable and the Person is the Delta]] **Related acquisition source:** [[articles/Technologies for Consciousness Mapping and Transfer|Technologies for Consciousness Mapping and Transfer]] **Relationship source:** [[research/Mind Uploading and AI Host-Residual Ecosystem Relationship Graph - 2026-09-10|Mind Uploading and AI Host-Residual Ecosystem Relationship Graph — 2026-09-10]] #### Outgoing typed edges - **HR-0537 — `wiki_links_to` → [[wiki/Direct-to-Chip Liquid Cooling|Direct-to-Chip Liquid Cooling]]** — **EXISTING WIKI EDGE**; evidence `WIKI_ARCHIVE`. Direct internal link currently present in `Coolant Distribution Unit.md`. - **HR-0538 — `wiki_links_to` → [[wiki/Facility Digital Twin|Facility Digital Twin]]** — **EXISTING WIKI EDGE**; evidence `WIKI_ARCHIVE`. Direct internal link currently present in `Coolant Distribution Unit.md`. - **HR-0539 — `wiki_links_to` → [[wiki/Rack-Scale Computing|Rack-Scale Computing]]** — **EXISTING WIKI EDGE**; evidence `WIKI_ARCHIVE`. Direct internal link currently present in `Coolant Distribution Unit.md`. - **HR-0540 — `wiki_links_to` → [[wiki/Thermal Architecture|Thermal Architecture]]** — **EXISTING WIKI EDGE**; evidence `WIKI_ARCHIVE`. Direct internal link currently present in `Coolant Distribution Unit.md`. #### Incoming typed edges - **HR-0605 — [[wiki/Direct-to-Chip Liquid Cooling|Direct-to-Chip Liquid Cooling]] `wiki_links_to` → this entry** — **EXISTING WIKI EDGE**; evidence `WIKI_ARCHIVE`. Direct internal link currently present in `Direct-to-Chip Liquid Cooling.md`. - **HR-1139 — [[wiki/Thermal Architecture|Thermal Architecture]] `wiki_links_to` → this entry** — **EXISTING WIKI EDGE**; evidence `WIKI_ARCHIVE`. Direct internal link currently present in `Thermal Architecture.md`.