As to the cooling effect of water on a heat sink . . .
Since you're in water anyway(esp if you're in fresh water), why not make a reservoir(container) of water that "drips" water over the hot side of the peltier heat sink. Sure . . . you'd have to refill the reservoir every once in a while, but hey . . . the water's all around you anyway and best of all . . . it's real simple . . . I like simple and cheap and will compromise being able to freeze things for being able to keep things cool.
John Francis
Newport 28
On Wed, Oct 24, 2012 at 7:13 AM, John Green <v_2jgree@operamail.com> wrote:
Hi, Kirk, thanks for the response......sorry but I don't understand the reference to 'tons'.I realise that an auto compressor creates cold quickly, and that I don't need that, but surely the HP required at, say, one 20th or one 50th of the RPM is less than at the speed the compressor is driven by a car engine?I suppose a better question I should have asked is "Can automotive AC systems work at lower RPM, and if so, what are the RPM limits if any?"Maybe I ought to just try turning a car compressor with a ratchet wrench, but they tend to have little room around them.I know that at idle, they produce frost on exposed pipes.And I know that they are power hogs at the design speeds driven on a vehicle.What I don't know is if the losses at lower outputs exceed the production rates at those same outputs, assuming reasonable heat insulation.The solar panels I have will have no spare capacity most of the time, but if the HP requirement is low enough, the cooler/fridge application might lend itself also to pedal power - any electricity savings obviously represent increased range and/or lower battery discharge levels for propulsion.It might be possible, too, to combine a compressor system with a Peltier system, that could be used when moored etc. and when there are watts to spare, but I am currently not sure if various charging types, (ie solar and wind and backup ICE) can be combined for simultaneous use to keep the batteries 'up'.JohnRe: 12V Accessories (Refrigeration) Sat Oct 20, 2012 1:50 pm (PDT) . Posted by: "Kirk McLoren" kirkmcloren you lost it with small. An automobile compressor is sized, depending on application, at 1 to 2 tons. Lots of glass in a car and metal conducts well also. Rapid draw down is important. A sealed compressor with 1/8 that capacity will keep your cream cool. Assuming 50% efficiency mechanical work to electricity and then electricity to mechanical work you are at 1/4 horse versus 1 or 2. Besides in most warm places there is reliable sun. photovoltaics to battery to dedicated inverter is smaller and more reliable. My 2 cents. Will Rogers quote: "Stupidity got us into this â€" why can't it get us out?"-- http://www.fastmail.fm - mmm... Fastmail...
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