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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Wave Powered Desalination
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.
The basic element of the vapour compression desalination system
Trickle sea water down one side of a heat transfer surface
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
= 0.77 kWh/m3
ΔT really matters
2.5 kWh/m3 to 10 kWh/m3
Straddles reverse osmosis.
Falling film heat transfer coefficient
3000 watt/m2 K
Carbon filled PVDF on expanded metal gives non-fouling surface with very long life.
6000 square metres
Heat transfer area
Suspend U-sheets from hangers
with inflated bags.
Cost slightly only slightly more than raw material.
Recover the heat from the double strength brine and fresh product by warming the incoming feed.
Two months !