Wave Powered Desalination
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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

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Wave powered desalination

Wave Powered Desalination

Stephen Salter, Joao Cruz,

Jorge Lucas, Remy Pascal.

School of Engineering

University of Edinburgh


Wave powered desalination

Desalination Techniques:

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.


Wave powered desalination

The basic element of the vapour compression desalination system


Wave powered desalination

Trickle sea water down one side of a heat transfer surface


Wave powered desalination

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


Wave powered desalination

Re-circulate the salt side until salinity reaches about 7%. Remove the fresh. product


Wave powered desalination

But ….

= 0.77 kWh/m3


Wave powered desalination

ΔT really matters

2.5 kWh/m3 to 10 kWh/m3

Straddles reverse osmosis.


Wave powered desalination

Falling film heat transfer coefficient

3000 watt/m2 K

Maxwell Davidson

Carbon filled PVDF on expanded metal gives non-fouling surface with very long life.


Wave powered desalination

6000 square metres

Heat transfer area


Wave powered desalination

Suspend U-sheets from hangers


Wave powered desalination

Seal edges

of U-sheets

with inflated bags.

Cost slightly only slightly more than raw material.


Wave powered desalination

Brine recirculation


Wave powered desalination

Recover the heat from the double strength brine and fresh product by warming the incoming feed.


Wave powered desalination

Two months !


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