Scored observables
Hot and cold outlet temperature, two-side heat duty, energy closure, and overall U.
AERO / HX-02B · BLIND INVESTIGATOR
BLOCKED PENDING PROPERTY RUNTIMEThe benchmark stopped before it could invent an answer.
GPT-5.6 Luna received only the frozen visible packet and selected an analytical-only path. The operating point, idealized measurement planes, and parametric area convention are now explicit; the sealed experimental reference remains closed while the independent supercritical-CO2 property runtime is still unavailable.
Why it stopped
The visible-input conventions are resolved in a new continuation stage. The remaining gate is an independently sourced, versioned sodium/supercritical-CO2 property runtime with a validity check. Supplying guessed supercritical-CO2 properties would break the blind protocol.
What remains in scope
Selected fidelity
ANALYTICAL_ONLY. No CFD, CHT, pressure-drop scoring, FEA, or CFD→FEA coupling was authorized.
Evidence state
No solver dispatch, no blind prediction freeze, no experimental reveal, and no validation claim.
Next legitimate action
Provide the independent property runtime and record its version/hash and validity range. This record stays immutable and the sealed truth stays unpublished until a complete blind prediction package exists.