Blueprint: Compost Heat Recovery for a Small Greenhouse — Build Specification

DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. Build specification for a water-loop compost heat recovery system serving a 48 m² propagation greenhouse, drawn from the source paper: William Alexander Aldred, 'Recovering Heat from Compost to Warm a Small Greenhouse: System Design, Heat Production Curve, and the Pile Mass Below Which the Plumbing Is Not Worth Installing', DOI: 10.5281/zenodo.24109097. The blueprint specifies the 8,000 kg compost pile (feedstock proportions, volume and construction with the coil laid in during the build), the 280 m buried HDPE coil, circulator and controls enforcing the 45 °C core temperature floor, the 1,000 litre buffer tank, the assembly sequence, the operating procedure across the 90-night heating season, tolerances, failure modes, maintenance and end-of-season teardown. Modelled performance, from the source paper: 2,727 kWh delivered over the season, covering 46.0% of night demand, with zero nights covered in full; below a pile mass of 6,500 kg the plumbing is not worth installing. All performance figures are simulated, not measured; no system built to this blueprint has been tested.