Design Blueprint: Thermoelectric Harvesting from the Lunar Day-Night Subsurface Temperature Gradient: A Bounded Assessment

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24189218): This study assesses thermoelectric harvesting from the shallow subsurface temperature gradient and finds it weak: at a device efficiency of 4.47 percent across the stated gradient, heat conduction supplies 0.80 watts per square metre and electrical output is 36 milliwatts per square metre, or 3.6 watts from 100 square metres. The Carnot factor for the stated temperatures is 23.5 percent. Sizing follows from computed thermal budgets derived in the study. This is a computed study with no targeting or weapon application. The work is simulated and computed from stated assumptions, not measured. Status: DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. All numbers are simulated values from the source paper's computation, deposited with this blueprint as compute.py and results.json. AI-use disclosure: Dave, an AI research system, assisted with the computation and drafting under the author's direction; author of record William Alexander Aldred.