Blueprint: Passive Solar Heating Wall — Build Specification

DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT, NOT LOAD-TESTED. Build specification derived from Aldred, 'A Passive Solar Heating Wall for Cold-Climate Low-Income Housing' (DOI: 10.5281/zenodo.24109179). Specifies the reference Trombe-class wall (8.0 m2 double glazing, 0.25 m / 4,400 kg dense concrete mass, dark absorber, vented cavity) for a 20.0 m2 room at USD 2,534 on stated unit rates: build-up, bill of materials, construction sequence, computed operating envelope (mean lift 7.95 K at 35 N clear to 0.64 K at 55 N overcast; 3.45 K at the 45 N partly cloudy central case), the sizing rule (0.37 K per m2; thickness 0.15-0.25 m only), vent sizing (at least 0.10 m2 free area per 8 m2 glazing against a 31.24 C closed-wall autumn peak), tolerances, failure modes, maintenance, and independent verification items. All performance numbers are from the source paper; no hardware was built or tested.