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Vance. I agree as simply ice alone may be the way to go with no water used at all...It does seem to me that it probably would work a bit longer using this spent but still cool water. The heated water would be reintroduced high back into this cooler so as to trickle down over this still solid ice and thus be better cooled. The resupplied cold water would be drawn from below. Tubing with multiple holes would prevent ice clogs and PVC pipe seems a cheap application here. How long either method would work is anybodies guess. I intend to find out. The smaller disposable coolers may be more of the size you need Vance. When done for the day...simply toss it water and all. From the DIY forum and what I saw aboard Jim's boat...It absolutely must be quiet. (1) Simplicity (2) Ease of use David Bartsch To: personal_submersibles@psubs.org Subject: Re: [PSUBS-MAILIST] ac unit Date: Mon, 2 Aug 2010 22:33:02 -0400 From: vbra676539@aol.com Dave, I was thinking simpler still. Just moving warm air from the bilge area through a container (a cooler is perfect, great idea). Maybe I'll cobble something up along this line and we'll compare them (power consumption versus cooling efficiency, or something).
Vance
-----Original Message----- From: David Bartsch <dbartsch2236@hotmail.com> To: personal_submersibles@psubs.org Sent: Mon, Aug 2, 2010 10:26 pm Subject: RE: [PSUBS-MAILIST] ac unit
Frank. I am a firm believer in KISS. It is using a pic nic basket from IGLOO. It is 12" X 12" from end view and lightly wider when viewed from the front. With this heat transfer coil installed on the lid it will be slightly taller. This coils intakes and discharges is into this ice chamber (intake from below and discharge above) One simply pours in ice and adds a small amount of tap water and closes the lid. The heat transfer unit flips up on hinges and secures in place. A flip of a single toggle switch applies 12 volts dc to the two brushless (quiet) cooling fans as well as the small recirculation pump. Heat is drawn from the units back and forced thru this cooling coil being supplied by ice saturated water by this small pump. Heat is drawn in the back and cool air blows out the front...until the ice melts and the water warms...then this is repeated for the next dive. Simple. I should point out that multiple coolers could be used with two way selector valves. As the cooling reduces, simply select the next cooler and so on. This first test unit will consist of but a single ice container. The cooling transfer is conducted via a small oil cooler such as is found at AutoZone or other auto parts distributors. The water pump will be via ebay and it will be about 2 liters a minute. (Slow but quiet) The unit is self contained and could be loaned to other subs at the drop of a hat if need be. David Bartsch From: ShellyDalg@AOL.com Date: Mon, 2 Aug 2010 21:57:28 -0400 Subject: Re: [PSUBS-MAILIST] ac unit To: personal_submersibles@psubs.org In a message dated 8/2/2010 6:06:00 P.M. Eastern Daylight Time, dbartsch2236@hotmail.com writes:
Stay cool. That's a pretty tall order Dave. Its been 97 all week with 93% humidity. News said the heat index was 107 degrees.
I look forward to hearing more about your AC machine. Maybe I'll test it by mounting it under my sheets at night.
Seriously though......will it be made for handling water ice or dry ice ? Sounds like a fun project.
I have a teacher friend who's requested a presentation and display of the sub in her middle school class, and have been contacted by a high school robotics teacher for the same.
Keep me posted on the AC unit and what power requirements, duct work etc. It will be a welcome addition to any subs operating in these waters.
Frank D.
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