Blueprint: Shared Seasonal Water Heat Store for Twenty Houses (from DOI 10.5281/zenodo.24108986)

DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. A manufacturable blueprint package for the shared variant of the seasonal water heat store in DOI 10.5281/zenodo.24108986. The single-house design is a buried insulated cylinder of 202.3 m3 (6.36 m diameter and height) holding water between 85 C and 35 C at 58.14 kWh per m3, losing 35.7 percent of its charge over six months and delivering half a house's yearly heat (7,560 kWh) at $1.167 per kWh against $0.148 for a heat pump. This blueprint builds the shared variant the source identifies as the scale at which the loss becomes acceptable: one buried store of 3,041.0 m3, 15.70 m in diameter and height, shared by 20 houses, at which the loss fraction falls to 14.5 percent (at or below 15 percent first at 20 houses, at or below 20 percent first at 10, at or below 10 percent first at 100), with 22.2 m2 of collectors per house, capital of $60,072 per house ($1,201,440 total, derived) and delivered heat at $0.592 per kWh — still above the heat pump, printed on the face. The package gives a bill of materials at component-class level, sizing rules, a construction sequence, commissioning and acceptance tests, operating limits, and failure modes including the half-insulation and high-temperature-radiator losing cases. Nothing was built or tested.