5 ms·

Article claims pumping water out to a "relative vacuum" How do they do this without causing the pumps to cavitate? Edit: here's the paper https://www.scienc

• amluto 1y ago
  I assume that “relative” is doing some heavy lifting. I bet they’re bringing in air from the surface at a bit over 1atm to replace the removed water.
  • manarth 1y ago
    They tested two approaches: "Open ventilation" (hose to the surface) and "Closed ventilation" (no air sources). "The most important finding was that an air-connection to the surface is not needed, reducing the technical effort significantly." [1] "Charging requires more time and energy with closed ventilation. In return the higher pressure difference results in a higher turbine power and energy during the discharging phase…ventilation is not beneficial in this regard." [2] [1] https://en.wikipedia.org/wiki/Stored_Energy_at_Sea https://en.wikipedia.org/wiki/Stored_Energy_at_Sea [2] https://www.sciencedirect.com/science/article/am/pii/S2352152X21007891 https://www.sciencedirect.com/science/article/am/pii/S235215... (PDF)