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bhong2002 said:that's cool site ,,
anything??,,, still surfing for this ideas,,, thanks
lord loh. said:How much can it cool? can it cool water to 4c?
Nigel Goodwin said:Probably a peltier device?.
Oznog said:Yes, technically. It depends on how cold you can keep the hot side and how fast you want to cool that water. It's going to be very slow and/or take a lot of power. The rate at which the cold side water's temp drops is basically inversely proportional to the temp difference between the hot and cold side. So it takes far longer to cool water to 4C than it does to 15C.
As an example of the scale, I had a small Peltier, like 1"x1", mounted on a thick piece of aluminum, that would freeze a drop of water in a few seconds. Having it take in 25C water and output to a cup at 4C would seem like a few drops per second.
Using the hot side of the Peltier to make hot water sounds ideal, but in practice allowing the hot side to actually get hot will mean it can't make cold effectively anymore.
Lord loh. said:How much can it cool? can it cool water to 4c?
justDIY said:peltier is the easiest way to go, and the least efficient
you need a "water block", which is a heat exchanger... energy from the water is extracted by a copper or aluminum block that has channels inside it. the peltier heatpump then removes the heat energy from the block.
check out some auction sites for a used peltier waterblock CPU cooler, wash it out really good, and plumb it into your water supply ... then just hook up a beefy power supply to the peltier, either with microprocessor control or a simple comparator and thermal probe.
The systems I've seen use a small 0.5 gal (or less) reservoir to store the chilled water, constantly circuilating it through the water block... since just one pass isn't going to remove much heat.
The peltier will also heat your water for you, just reverse the polarity and the cold side now gets very hot - use an H-bridge and you can do both with one setup.
bhong2002 said:i am not sure if it is, because i didn't seen inside of the box.
Nigel Goodwin said:Couldn't be much else?, you also mentioned a PC fan at the base? - that will be cooling the hot side of the peltier device, it's probably just a standard processor heatsink/fan assembly stuck on the peltier?.
bhong2002 said:thanks for some advice ,,, maybe i should do some divider for the heat side and for the cold side of the peltier secured by a sealant, and the heat side having a fan for the exhaust going to my outdoor? (heat & cold side has a separate fan)....
bhong2002 said:you're right , what if i have a 5 gallon reservoir? with a small aquarium water pump?,,, my main consideration is a peltier,,,it can be overused?