Blueprint: Acid-Scrubbed Vent for a Covered Manure Store — Build Specification

DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. A full build specification for the acid-scrubbed vent for a covered manure store published in the source paper: William Alexander Aldred, 'Capturing the Nitrogen That Escapes from Stored Manure: An Acid-Scrubbed Vent for a Covered Store, Its Nitrogen Budget and Its Break-Even Herd Size', DOI: 10.5281/zenodo.24108897. The blueprint specifies the 40 m x 40 m x 5 m covered store (1,600 m2, 8,000 m3, 0.6 m headspace) for an 800-cow dairy herd, the single slow-draw vent at 480 m3/h (0.5 air changes per hour, 89 W fan at 400 Pa), the packed-bed scrubber sized by transfer capacity (K = 2,200 m3/h, single-pass efficiency 0.990), sulphuric acid dosing (4.01 kg of 96% commercial acid per kg of nitrogen captured; 27,757 kg/yr), and ammonium sulphate output (32,637 kg/yr), with dimensions, materials and quantities, assembly sequence, commissioning checks, tolerances, failure modes and a maintenance schedule. The operating envelope prints the source paper's break-even limits at full size: capture stops paying below a herd of 720 cows, below a mean slurry temperature of 11.3 C, and above a vent rate of 0.76 air changes per hour. Every quantity is either taken from the source paper (DOI: 10.5281/zenodo.24108897) or derived from its parameters in the accompanying compute.py and recorded in results.json. No unit has been built or measured. SIMULATED, NOT MEASURED — NOT BUILT.