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

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.

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


But ….

= 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

Maxwell Davidson

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


Seal edges

of U-sheets

with inflated bags.

Cost slightly only slightly more than raw material.


Brine recirculation


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


Two months !


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