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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #11  
Old 02-21-2014
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Re: Solar powered cooling

Zeolites are commonly used today in the "oxygen generator" machines that supply oxygen without needing tanks. And the same unit, which discard nitrogen as a waste gas, is plumbed "backwards" to make the nitrogen generator that the auto shops have gone crazy about for nitrogen filling tires at obscene prices. So, yes, common and proven technology.

As is ammonia refrigeration, even used on the International Space Station today. The problem being that ammonia is highly corrosive and if there's a leak, your eyes, throat, and lungs may be burned out before you can call for help.

So, great stuff, great potential, but there's a reason it has fallen out of favor except for commercial and industrial users.

Heat, swamps, alligators, mosquitoes...this is God's way of saying "Go play golf somewhere else."
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Old 02-21-2014
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Re: Solar powered cooling

Quote:
Originally Posted by capta View Post
As mentioned above, ammonia was a pretty common refrigerant at one time. I ran a refer ship that had ammonia refrigeration and it was very efficient, but extremely dangerous.
Seems at least according to the Danfloss web site (was reading on my phone the other day so I don't have a link) it is still used in industrial refrigeration today. They were even touting it as more environmentally friendly than any of the new freon replacements.
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Old 02-21-2014
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Re: Solar powered cooling

Quote:
Originally Posted by Torch View Post
would the dehumidifier provide potable water? Is so, that would be a dual benefit.
Not from common zeolites as they 'release' (desorb) their water in the form of vapor (gas).
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Old 02-21-2014
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Re: Solar powered cooling

"They were even touting it as more environmentally friendly than any of the new freon replacements. "
Absolutely! When a rr car full of ammonia derails and spills, it may kill a thousand people, which is good for the environment. And it certainly won't hurt the ozone layer. So unless you count living creatures as part of the environment, ammonia is absolutely great compared to "Freon".

Odd that Danfoss doesn't offer ammonia systems for small craft, isn't it? [sic]
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Re: Solar powered cooling

Here:
Adsorption Heat Pump - Building Equipments | Mitsubishi Plastics, Inc.
is the low temperature regeneration zeolite product made by Mitsubishi for something like this.
Regeneration could be accomplished by using heat put out by the absorbing unit or by a solar water heater. Notice they do say regeneration is done by heating with hot water.
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Old 02-22-2014
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Re: Solar powered cooling

Sold! I'm mounting one of these on my foredeck.
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