Blueprint: Village Compressed-Air Store Using an Existing Tested Vessel — 3.00 kWh per Evening (from DOI 10.5281/zenodo.24108667)

DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. A manufacturable blueprint package for the only surviving variant of the compressed-air store in DOI 10.5281/zenodo.24108667: a village system delivering 3.00 kWh per evening to 50 households (60 Wh each) from a pressure vessel that already exists on site, passes a hydrostatic test, and is purpose-rated for 20 bar gauge air service. With heat of compression stored and returned, the vessel must be at least 4.47 m3, round-trip efficiency is 28.3 percent, input is 10.61 kWh per evening and the compressor is 2.12 kW over five hours; without heat storage the vessel must be at least 7.94 m3, efficiency is 15.9 percent and input is 18.87 kWh. Costed build estimate with the vessel at zero purchase cost is $7,600 with heat storage, and the source levelised cost for the free-vessel case is $1.273 per delivered kWh with heat storage and $1.123 without — still above a complete lithium system at $0.324, so the blueprint states the full winning conditions on its face, including direct use of the air for workshop tools. The purchased-vessel and 142-tank repurposed cases are printed as failures. The package gives a bill of materials at component-class level, sizing rules, construction sequence, commissioning tests including leakage and pressure figures from the source, safety boundaries for pressure vessels at full size, and failure modes. Nothing was built or tested.