Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 25-02-2010, 12:02   #31
Registered User
 
mintyspilot's Avatar

Join Date: Feb 2010
Location: UK
Posts: 834
Kristian

In principle I think it will work. I think enough people have done the basic experiments to show that it is possible. We now have to consider constraints such as is it practical on a rolling boat? What size is the appartus? What rate does it produce water at and how much water do you actually need?

I reckon that we will need to wait until the equinox on 21st March before the sun gets powerful enough at this latitude to heat water.
__________________

__________________
mintyspilot is offline   Reply With Quote
Old 25-02-2010, 12:51   #32
Registered User
 
Jolly Roger's Avatar

Join Date: Oct 2006
Location: Titusville, Florida - for the moment
Boat: Down East 45, Brigantine
Posts: 944
Images: 1
Hey! Don’t get me wrong chaps, I’m all for self sufficiency where it is reliable. Drinking water at sea has been a timeless problem, so long as man has ventured upon it, and if someone can come up with a practical means of making the stuff out of sea water, for no money, whacko! They tell me modern watermakers can make drinking water out of any quality of sea water, but would this apply with Kristian’s idea? Would you not have to filter the water first to get nasty little bits out of it? The question of reliability is very important as well, because anyone who rigged such a contraption would then perhaps think they don’t need the proverbial Jerry Cans, and may even be tempted to shower more often than once a fortnight. Then the sun goes in and they are snookered……I think I will stay with my time honoured backup, canned Guinness. It keeps well in the bilge, tastes better than water, you can cook with it, and it has the singular effect of soothing gales, often reducing an eight to a six in no time at all.
__________________

__________________
Jolly Roger is offline   Reply With Quote
Old 25-02-2010, 13:03   #33
Do… or do not
 
s/v Jedi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 9,198
I think this thread is on the wrong track. Without checking numbers, I think that the sun evaporates enough water from the sea all around us already so why not skip the boiling step and try to catch the water vapor that's all around us already? When the wind is up, enormous quantities of water are flowing over our decks and we just let it go while running watermakers. I think my original suggestion for a wind-trap wasn't taken serious enough because of my Arrakis, and Nua'Dib story...

cheers,
Nick.
__________________
s/v Jedi is offline   Reply With Quote
Old 25-02-2010, 13:57   #34
Registered User
 
Kristian's Avatar

Join Date: Jan 2010
Location: Sweden / Castelsardo Sardinia
Boat: Grand Soleil 52 in the Med also OE36 building project in Sweden
Posts: 57
Wind trap

Hi S/V Jedi!

I like your idea and sure I belive that there is enough water in the air to satisfy our every needs.

I just have to admit that I have not given the idea any serious thoughts.

From the top of my mind I can only see three ways of getting to that water and it is by lowering the temp in the air or lowering the pressure or finally a combination of the two first.

I have to think a lot more to even have a first go at how to do that but it sure could be interesting!!

Dear Jolly Roger,

I do sure agree on that reliability is a major issue when it comes to water and long trips across the ocean.
I guess that prudence dictates that you shoud back up your sources of potable water no matter what way you go.

That given I belive that the simpeler the system the smaller the chances of a failure.

Rgds

Kristian
__________________
Kristian is offline   Reply With Quote
Old 25-02-2010, 13:59   #35
Registered User
 
mintyspilot's Avatar

Join Date: Feb 2010
Location: UK
Posts: 834
Nothing wrong with your idea Nick, but we had already invested mental capital in the solar boiler idea. One crisis at a time.....
__________________
mintyspilot is offline   Reply With Quote
Old 25-02-2010, 15:26   #36
Do… or do not
 
s/v Jedi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 9,198
;-) but the sun & sea is one big solar boiler ;-)

On condensing from the wind, my first idea: create pressure with wind trap, like funnel-shape into small diameter hose. Next an expansion valve to dramatically lower pressure followed by a condenser. Production can be 4 times lower than using the sun because it'll work 24 hours per day.

cheers,
Nick.
__________________
s/v Jedi is offline   Reply With Quote
Old 25-02-2010, 15:35   #37
Registered User
 
mintyspilot's Avatar

Join Date: Feb 2010
Location: UK
Posts: 834
How about this as a variation?

Have a black metal plate facing the sun over which you run salt water warming it up. It then "dribbles" down a grid facing into the prevailing wind. Being warm it will have more tendency to evaporate from the grid and saturate the incoming airflow. This could then be directed onto a cold metal plate to condense the vapour into water and thence into a run-off channel.

I suspect that the warmer the salt water is, the more efficient this process would be.
__________________
mintyspilot is offline   Reply With Quote
Old 25-02-2010, 15:38   #38
Registered User
 
anjou's Avatar

Join Date: Apr 2009
Location: Malvernshire, on the sunny side of the hill.
Boat: 50' steel canal and river cruiser
Posts: 1,905
Quote:
Originally Posted by s/v Jedi View Post
I think this thread is on the wrong track. Without checking numbers, I think that the sun evaporates enough water from the sea all around us already so why not skip the boiling step and try to catch the water vapor that's all around us already? When the wind is up, enormous quantities of water are flowing over our decks and we just let it go while running watermakers. I think my original suggestion for a wind-trap wasn't taken serious enough because of my Arrakis, and Nua'Dib story...

cheers,
Nick.
Nick
There is already a condensation machine for doing this but its so power hungry. Bad enough if your plugged in to the grid but not going to work on the hook.
__________________
www.amy-artimis.blogspot.com
anjou is offline   Reply With Quote
Old 25-02-2010, 15:40   #39
Registered User
 
anjou's Avatar

Join Date: Apr 2009
Location: Malvernshire, on the sunny side of the hill.
Boat: 50' steel canal and river cruiser
Posts: 1,905
Quote:
Originally Posted by s/v Jedi View Post
;-) but the sun & sea is one big solar boiler ;-)

On condensing from the wind, my first idea: create pressure with wind trap, like funnel-shape into small diameter hose. Next an expansion valve to dramatically lower pressure followed by a condenser. Production can be 4 times lower than using the sun because it'll work 24 hours per day.

cheers,
Nick.
Would a large aircraft type venturi create enough low pressure?
Trouble is, the wind has to be blowing.
__________________
www.amy-artimis.blogspot.com
anjou is offline   Reply With Quote
Old 25-02-2010, 16:08   #40
Registered User
 
Jolly Roger's Avatar

Join Date: Oct 2006
Location: Titusville, Florida - for the moment
Boat: Down East 45, Brigantine
Posts: 944
Images: 1
Quote:
Originally Posted by Kristian View Post
Hi S/V Jedi!

Dear Jolly Roger,

I do sure agree on that reliability is a major issue when it comes to water and long trips across the ocean.
I guess that prudence dictates that you shoud back up your sources of potable water no matter what way you go.

That given I belive that the simpeler the system the smaller the chances of a failure.

Rgds

Kristian
That's why I suggested the canned Guinness - can't get anything simpler than that. The only problem I can envisage is showering. That could be really messy and very wastefull as well.
__________________
Jolly Roger is offline   Reply With Quote
Old 25-02-2010, 16:43   #41
Registered User
 
rover88's Avatar

Join Date: Nov 2008
Location: Panhandle of Florida USA
Boat: Bristol 34
Posts: 328
Images: 4
Place a tall cup in the center of a much larger pot. Surround the cup with wet seaweed and a half litre of sea water. Place and secure a sheet of plastic over the pot loose enough to weigh it with a small stone in the center. Leave in sunlight. Condensation will form on the plastic and drip down into the cup. It will yield a couple of mls of fresh water. Just enough to make you more thirsty.
__________________
rover88 is offline   Reply With Quote
Old 25-02-2010, 22:03   #42
Do… or do not
 
s/v Jedi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 9,198
For condenser, how about a Peltier element?

Yes, wind is needed but so many boats are in the tradewinds with enough of that!

cheers,
Nick.
__________________
s/v Jedi is offline   Reply With Quote
Old 26-02-2010, 08:07   #43
Registered User
 
lorenzo b's Avatar

Join Date: May 2009
Location: Panama
Boat: Steel trawler 63' Eileen Farrell
Posts: 961
There is a book called Sailing The Farm written in the 70's that has plans for solar water makers that are really simple for use on small boats. The book is a real goof to read, truly a blast from the past.
__________________
lorenzo b is offline   Reply With Quote
Old 26-02-2010, 08:23   #44
Registered User
 
mintyspilot's Avatar

Join Date: Feb 2010
Location: UK
Posts: 834
That is a great tip. Thanks. I shall be making a trip to the local library for that.
__________________
mintyspilot is offline   Reply With Quote
Old 27-02-2010, 19:20   #45
Registered User

Join Date: Nov 2008
Location: Washington, DC
Boat: Columbia 41
Posts: 522
A few months ago I brought a Soleusair dehumidifier aboard. It runs on 120v shore power. It does a good job and keeps the condensate to a minimum. But it also produced about a gallon of water daily. I am wondering if the mechanics of dehumidification can be adapted to make even more water. What do you say?
__________________

__________________
Sam Plan B is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Do Watermakers Work in Fresh Water? drew.ward Plumbing Systems and Fixtures 38 03-11-2013 20:56
Jeanneau Sun Odyssey vs Sun Fast hoppy Monohull Sailboats 1 20-09-2009 12:14
Would This Work for Water? boat_alexandra Provisioning: Food & Drink 18 31-08-2009 18:27
Sun Shades TexSail Construction, Maintenance & Refit 1 26-02-2008 17:20
Power of the Sun Gallivanters Electrical: Batteries, Generators & Solar 1 16-08-2007 12:07



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 11:05.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.