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Old 26-01-2012, 13:31   #1
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How do you get potable water from this process ?

This is a teaser question that I have to ask the commercial sailors not to answer.

On our boats we use watermakers to push at high pressure, sea water through a number of membranes. It uses a fair amount of electrical energy to produce potable water. On commercial vessels, the wasted heat energy from the engine(s) at 180* F is used to boil sea water and collect the distillate via condensation, thus producing potable water.

The teaser question is how they manage to boil water at 180*F?
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Old 26-01-2012, 13:34   #2
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Re: How do you get potable water from this process?

Vacuum distillation.

They pull a vacuum over the water, and reduce the boiling temp of the water down to around 180F or less. Most of this vacuum can be typically generated by a condenser, and a small liquid pump. However typically they have to include a small vacuum pump in order to keep air from building up in the system.
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Old 26-01-2012, 13:39   #3
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Re: How do you get potable water from this process?

Do you drink water?
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Old 26-01-2012, 13:53   #4
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Re: How do you get potable water from this process?

Well that sure wasn't very challenging. This box is reinforced so it doesn't crumble like a beer can when pulled in a vacuum, you can see the bracing between the insulation.

ViribusUnitis nailed it in short order.

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Old 26-01-2012, 14:01   #5
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Re: How do you get potable water from this process?

So you don't lock up the side of a mountain? ehehheheh.
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