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IGB-ADR-003 — Thermal Architecture

ADR Identifier

IGB-ADR-003

Title

Thermal Architecture

Status

Frozen

Evidence State

Canonicalized from the legacy ADR-003-Thermal.md.

The thermal architecture decisions recorded in this ADR are supported by the currently verified repository evidence.

Context

The engineering architecture establishes distinct thermal roles for the SV-K01 enclosure, SV-T01M thermal module, and SV-DC01 interface.

The currently verified repository evidence establishes the functional thermal architecture but does not establish the complete thermal implementation specification.

Problem Statement

The engineering architecture requires a defined thermal strategy covering:

  • SV-K01 airflow architecture
  • SV-T01M independent thermal management
  • SV-DC01 thermal isolation from the phone

Alternatives Considered

Not Established.

No verified repository evidence currently identifies the alternatives considered during the original decision.

Decision

The following thermal architecture decisions are frozen:

SV-K01

Labyrinth airflow

SV-K01 adopts a Labyrinth airflow architecture.

SV-T01M

Independent thermal module

SV-T01M is designated as an independent thermal module.

SV-DC01

Thermal isolation from phone

SV-DC01 is designated as thermally isolated from the phone.

These functional architectural decisions are directly supported by the legacy ADR-003 record.

Decision Rationale

Not Established.

The repository evidence confirms the selected thermal architecture, but does not establish the original decision rationale.

Consequences

The functional thermal separation defined by this ADR shall be preserved across subsequent engineering development.

Subsequent implementation details shall not redefine these frozen thermal architecture assignments without controlled architectural change.

The specific airflow geometry, thermal resistance targets, fan specifications, heatsink design, thermal interface materials, temperature limits, control algorithms, and validation criteria are not established by this ADR unless separately specified and verified.

Development History

docs/architecture/development-history/v12.0.0-Development-History.md

The verified development history additionally records:

  • SV-K01 Tactical Case established.
  • SV-T01M Mobile Thermal Module established.
  • SV-T01M and SV-DC01 aligned on the same plane.
  • Board-to-Board / Pogo Pin between SV-DC01 and SV-T01M.

These records provide related development evidence but do not replace the original ADR decision record.

Development Changelog

docs/architecture/development-history/CHANGELOG.md

The verified changelog records:

  • SV-K01 Tactical Case.
  • SV-T01M Mobile Thermal Module.

EACC Change-Control Record

04-Architecture/EACC/Change-Control/ECR-SVC01-001_SV-C01_IGB-IAA_Integration.md

The repository contains a later change-control record referencing:

  • Power and thermal assessment.
  • SV-DC01 / SV-D01 compatibility assessment.

The current evidence does not establish that this record defines the original ADR-003 decision or its rationale.

Not Established.

No verified thermal specification has been identified in the current evidence inventory that establishes the detailed implementation of the ADR-003 decisions.

Not Established.

No verified thermal verification or validation asset has been identified in the current evidence inventory.

Approval Information

Not Established.

The legacy ADR establishes the status as Frozen, but no separate approval authority or approval record has been identified in the currently verified evidence.

Traceability

Direct Evidence

  • Legacy ADR: docs/architecture/Architecture-Decision-Records/ADR-003-Thermal.md

Development History

  • docs/architecture/development-history/v12.0.0-Development-History.md
  • SV-K01 Tactical Case established.
  • SV-T01M Mobile Thermal Module established.
  • SV-T01M and SV-DC01 aligned on the same plane.
  • Board-to-Board / Pogo Pin between SV-DC01 and SV-T01M.

Development Changelog

  • docs/architecture/development-history/CHANGELOG.md
  • SV-K01 Tactical Case.
  • SV-T01M Mobile Thermal Module.
  • ECR-SVC01-001
  • Power and thermal assessment.
  • SV-DC01 / SV-D01 compatibility assessment.

This record is treated as related engineering evidence and does not establish the original ADR-003 decision rationale.

Revision History

Revision Description Evidence
Rev.1 Canonicalization of legacy ADR-003 Legacy ADR-003, Development History, CHANGELOG

Governance

This ADR is governed by:

  • Engineering Constitution Rev.1
  • Chapter 28 — Architecture Decision Record (ADR) Governance
  • Approved Engineering Governance System
  • Engineering Baselines
  • Configuration Management Procedures

This ADR records engineering decisions and does not establish or modify governance authority.