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04-04-2017, 05:46 PM
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#1
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Senior Member
City: Wherever the boat is
Vessel Name: Kismet
Join Date: Sep 2016
Posts: 458
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Better Watermakers in the future?
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04-04-2017, 05:53 PM
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#2
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Guru
City: Gig Harbor
Vessel Name: Kinship
Vessel Model: North Pacific 43
Join Date: May 2015
Posts: 9,046
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Interesting
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04-04-2017, 05:56 PM
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#3
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Guru
City: Seaford Va on Poquoson River, VA
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 2,264
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Quote:
Originally Posted by kev_rm
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But what is the advantage?
If less pressure or cheaper then good.
We already have membranes, are these going to last longer?
The article gives no info.
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04-05-2017, 11:57 AM
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#4
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Senior Member
City: Watts Bar Lake, Tn River
Vessel Name: RedBoat
Vessel Model: MS 34T
Join Date: Apr 2013
Posts: 148
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__________________
LongJohn
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04-05-2017, 12:54 PM
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#5
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Senior Member
City: Green Country
Join Date: May 2015
Posts: 243
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I'm of the opinion that graphene will not only change water-making but material science in pretty much every field. Nice to see it being applied.
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04-05-2017, 02:02 PM
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#6
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Curmudgeon
City: Stoney Creek, MD
Vessel Name: Moon Dance
Vessel Model: 1974 34' Marine Trader Sedan
Join Date: Oct 2007
Posts: 2,775
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I've been hearing about graphene for a while now. Are there any real world applications in use yet?
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04-05-2017, 04:59 PM
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#7
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Guru
City: Southern Maine
Vessel Model: Prairie 36 Coastal Cruiser
Join Date: Dec 2012
Posts: 2,714
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It seems the problem is scaling up production to an industrial scale.
Nothing in the article made me believe new graphene membranes are just around the corner. Beyond manufacturing cost, there are number of other "what if's" that still need to be answered.
How quickly will they become plugged up? How will the sandwich material required to keep them in shape hold up? Will they be cheaper? Will they last longer? Will they require lower pressure?
I'd love to see a cheaper, easier to maintain watermaker. I'm not holding my breath.
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04-05-2017, 08:43 PM
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#8
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Guru
City: Ashland, MA
Vessel Model: 1990 Silverton 40 aftcabin
Join Date: Jul 2016
Posts: 1,208
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It is a huge step from a laboratory test to profitable production.
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04-05-2017, 09:56 PM
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#9
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Technical Guru
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
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Big question is what kind of differential pressure will it take for this new membrane to function? I read a long time ago that the dp was related more to physics and not so much classical engineering flow dynamics. Read quite a bit about it, remember no more than that last sentence.
So will this operate like a funnel with a coffee filter in it? Or need lots of bar to push it through??
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04-06-2017, 07:08 PM
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#10
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Senior Member
City: Wherever the boat is
Vessel Name: Kismet
Join Date: Sep 2016
Posts: 458
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Conceptually I believe a near perfectly sized sieve is going to be a lot more efficient than RO. Agreed just in the lab at this point.. but promising (and not just for boating either.. lots of communities would massively benefit from cheap desal)
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04-07-2017, 09:20 AM
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#11
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Guru
City: Ashland, MA
Vessel Model: 1990 Silverton 40 aftcabin
Join Date: Jul 2016
Posts: 1,208
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Quote:
Originally Posted by kev_rm
Conceptually I believe a near perfectly sized sieve is going to be a lot more efficient than RO. Agreed just in the lab at this point.. but promising (and not just for boating either.. lots of communities would massively benefit from cheap desal)
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As I understand the reverse osmosis process, water is forced through a membrane like filter.
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04-07-2017, 09:43 AM
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#12
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,119
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Not sure this new membrane is really RO from the several articles I read..more of just a filtering process.
Probably why they think it will be cheaper if they can bring the cost of the membranes down.
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04-08-2017, 08:30 AM
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#14
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Guru
Join Date: Oct 2007
Posts: 22,553
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The big expense in RO is the energy needed to pressurize the the water before it goes thru a membrane.
Anything that will stop the salt at a lower pressure would be grand.
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04-08-2017, 04:56 PM
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#15
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Guru
City: Seaford Va on Poquoson River, VA
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 2,264
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Quote:
Originally Posted by FF
The big expense in RO is the energy needed to pressurize the the water before it goes thru a membrane.
Anything that will stop the salt at a lower pressure would be grand.
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My guess, this is just another way to make a membrane that will work the same as other membranes, only this is graphene related. Perhaps pore size is more uniform.
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