# HX-02B selection report

## Program result

**`HX02B_SELECTED` — Zhang, Zhao, Liang and Li (2022), “Experimental Study on Prototype of Printed Circuit Heat Exchanger,” Frontiers in Energy Research 10:835224, DOI 10.3389/fenrg.2022.835224.**

The open full text provides one coherent two-stream sodium/supercritical-CO₂ prototype with core/channel dimensions, matched mass-flow/pressure/inlet conditions, inlet/outlet temperature measurement, heat-duty balance, overall-U calculation, wall-temperature layout and instrument accuracies.

## Scope boundary

This earns selection only for a thermal-fluid observable set: hot/cold outlet temperatures, two-side heat duty, energy-balance closure, overall U and a bounded wall-temperature trend. The paper does not provide a selected pressure-drop truth table in the accessible record, and wall-material identity is not sufficient for a scored CHT/FEA extension. Those quantities are not smuggled into the benchmark.

## Rejected and alternate candidates

The register retains the Kim HX-02 stop, Chu and Cheng alternates, Kucuk’s one-side shell study, NASA compact-exchanger reports, and other PCHE candidates. Chu and Cheng remain possible later alternates only after lawful full-text/data acquisition and a fresh custody screen.

## Next step

The visible and sealed HX-02B packets are frozen for human review. Luna, CFD, FEA and experimental reveal are intentionally not run in this stage.