Abstract

This is a corrected and expanded revision of ALLFROMAIR® TERRA² Technical Addendum 7, superseding the version at tdcommons.org/dpubs_series/9825 (16 April 2026). It corrects the earlier passive-cowling claim and adds bidirectional fan regeneration; a permanent-DOI copy is maintained at Zenodo (concept DOI 10.5281/zenodo.19581339).

Abstract

This Addendum discloses six extensions to the ALLFROMAIR® TERRA² Tri-Generation Platform:

  1. Wind-Assisted Aeraulic Drive — ambient wind as a partial or complete substitute for fan work through the Anticubic U-Channel, by direct superposition of free-stream dynamic pressure on the system pressure balance.
  2. Power-Inlet Pressure-Recovery Cowling — a convergent sail-fabric inlet whose function is full recovery of free-stream total pressure and tolerance of off-axis wind, not energy concentration.
  3. Regenerative Electromagnetic Braking — stepless EC-fan inverters operated as retarders, recovering the surplus above system resistance for sensor and control self-supply.
  4. Marine-Grade Self-Locking Storm Dampers — worm-gear actuators holding position at 0 W electrical holding power.
  5. Reduced-Component ECO Configuration — omission of the compressor and HX2 — the single reversible heat exchanger that serves alternately as condenser and as evaporator, one section of which is mounted within the U-channel bend — at qualifying sites; this simultaneously removes the dominant electrical load, lowers system pressure drop from 155 Pa to a bounded range of 88–113 Pa, and thereby lowers the fan-free wind threshold from 16.1 m/s — which lies above the 15 m/s storm-furling limit and is therefore unreachable — to 12.1–13.7 m/s, which lies within the operating envelope at both bounds. Capital cost falls correspondingly. Combined with a reduced design velocity, the threshold falls to 6.1–9.1 m/s.
  6. Goldilocks Site-Selection Framework — siting methodology governed by the constraint T_sw + 4 °C < T_dew,inlet.
  7. Bidirectional Fan Regeneration (v9) — relief gills, feathering blades and the channel’s own diffuser effect that let the existing EC fans generate from wind at ~8 m/s, improving the regeneration envelope of item 3. With this and the wind assist of item 1, effective specific energy is 1.8–4.0 kWh/m³ depending on site and production, at or below reverse osmosis while returning oxygenated water to the sea rather than brine.

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