t03 Desalination has a floor
Supplied working report; original verdicts not validated.
Review status: Needs review. This is an archival source note, not a passed proof.
notes.md
# t03 Desalination has a floor For 35 g/L seawater the van't Hoff osmotic pressure is 29.7 bar, which is the minimum work per cubic metre at vanishing recovery, 0.825 kWh/m3. The reversible work of separation per unit product is pi0 * ln(1/(1-R))/R, which rises to 1.143 kWh/m3 at 50% recovery and 2.110 kWh/m3 at 90%, and diverges as the brine concentrates toward saturation. The posted prediction that specific energy rises steeply with recovery is therefore supported, and the refutation condition - energy independent of recovery - does not hold. This is the ideal bound, not a technology forecast.