Design Blueprint: A Sabatier and Electrolysis Air-Revitalisation Loop for Four Crew: Oxygen Recovery, Power and Closure

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24145315): This paper presents a computed design for a chemical air loop in which water electrolysis supplies oxygen and hydrogen, and a Sabatier reactor converts exhaled carbon dioxide and hydrogen into water and methane, closing part of the oxygen loop. 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.