Design Blueprint: A Helium Recovery Condenser for a Low-Temperature Laboratory: Liquefaction Rate, Cold-Head Load and Recovery Fraction

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24147812): This paper presents a computed design for a helium recovery condenser intended for cryogen recovery systems, with its performance, resource budgets and margins derived from stated assumptions rather than asserted. The headline results are: liquefaction rate set by the limiting stage of 20.3 litres per day; total heat to be removed per litre of liquid produced, all stages of 51.8 kJ per litre; frac 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.