Wave Powered Desalination. Stephen Salter, Joao Cruz, Jorge Lucas, Remy Pascal. School of Engineering University of Edinburgh. Desalination Techniques: Multi-stage Flash. Has to be big. Good for using waste heat. 1960s. Reverse Osmosis . Large or small.
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Stephen Salter, Joao Cruz,
Jorge Lucas, Remy Pascal.
School of Engineering
University of Edinburgh
Multi-stage Flash. Has to be big.
Good for using waste heat. 1960s.
Reverse Osmosis. Large or small.
Electricity or Diesel. High, steady pressure.
Vapour compression. Low pressure.
High volume. High purity. Variable pressure.
Suck away a little of the vapour and pump to the other side where it condenses on the newly cooled surface to re-circulate the latent heat
Re-circulate the salt side until salinity reaches about 7%. Remove the fresh. product
But …. Remove the fresh. product
= 0.77 kWh/m3
Δ Remove the fresh. productT really matters
2.5 kWh/m3 to 10 kWh/m3
Straddles reverse osmosis.
Falling film heat transfer coefficient Remove the fresh. product
3000 watt/m2 K
Carbon filled PVDF on expanded metal gives non-fouling surface with very long life.
6000 square metres Remove the fresh. product
Heat transfer area
Suspend U-sheets from hangers Remove the fresh. product
Seal edges Remove the fresh. product
with inflated bags.
Cost slightly only slightly more than raw material.
Brine recirculation Remove the fresh. product
Recover the heat from the double strength brine and fresh product by warming the incoming feed.
Two months ! product by warming the incoming feed.