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Design study (SIMULATED, NOT MEASURED) of a water-loop compost heat recovery system for a 48 m2 propagation greenhouse: an 8,000 kg pile delivers 2,727 kWh of usable night heat over a 90-night season, covering 46.0% of night demand, with a break-even pile mass of 6,500 kg below which the plumbing is not worth installing.
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William Aldred (2026) studied this question.
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