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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Special purpose low-power air conditioning - metal involved!
I've asked a few people about this personally, but I'd like to throw it
open to the larger group as well. I'm trying to cool the boat for a few days at a time... A normal 5000 BUT marine air conditioner can pull up to 30 amps of 12 volt power. If my house battery were new and fully charged, that's 4 or 5 hours. That won't get it for even for a weekend. If we had a diesel engine (and ran it all day) we could use an automotive approach. But we don't - and can't. So, quoting Kelly Johnston (one of my favorite heroes), "Simplicate, and add lightness". Statement of Problem: I want to air condition the boat for up to 3 or maybe 4 days at a time. Independent of dock power. With as low of a battery load as possible. Proposed Solution: A cooler type container with a load of dry ice and a way to move large amounts of air across the cooler. A sketch at: http://www.home.earthlink.net/~cave-1/images/ac-3.jpg I'm already thinking glycol for the fluid. But what to make the rest of it from? Cheap, off the shelf stuff preferred! A pump that can handle antifreeze? High torque low power 12 volt DC motors? What to use for the heat exchangers? Coils of tubing? Or auto parts? Other than a drip pan (and a handful of brain cells), what am I missing? Thanks all, Richard |
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