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Author: Subject: Homebuilt re-circulating chiller pump
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[*] posted on 20-6-2008 at 21:37

I have noticed that the only problem with vehicle A/C units is the compressor. It is run by the same belt in the motor that turns the alternator etc. Basically, to use it you would have to have an electric motor with a belt. Also, they use a magnetic clutch to (de)activate. That is so it's not always running whenever the engine is in use.

It would take up a lot of room to set it up but would be interesting...

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Mr. Wizard
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[*] posted on 20-6-2008 at 22:28

Here is a guy that made a quick and dirty refrigeration unit using propane.
He then went on to modify a refrigerator using propane. Lots of pictures and practical information.
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[*] posted on 11-7-2008 at 12:49

Although it doesn't have even CLOSE to the refrigeration power as a common recirculator, an inexpensive option one could use for something as simple as a cold condenser finger is this:

Also, keep an eye out in the aquarium section of your local can sometimes pick up an inexpensive probe or recirculating chiller used for aquariums. These are anywhere from 1/10 hp to 1 hp models.

[Edited on 11-7-2008 by F2Chemist]
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Bon Vivant

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[*] posted on 1-5-2010 at 02:01

I have an even more basic suggestion.

Go to the local dump and salvage a freezer. Remove all the drawers and compartments.

Install into said freezer a large bin that uses up as much room as possible. Fill the bin with water and some anti-freeze.

Drop a recirculating pump into the bin. Drill two holes in the freezer and connect your in/out lines to the pump.

If my memory is working right, a normal household freezer can manage up to -18C.

The compressor won't be able to keep up with solvents that have a high latent heat capacity, but the huge thermal mass of the water in the bin will mean the temperature won't change all that much during an at home scale distillation.

You could even improve the thermal mass of this idea further still. Drop a bunch of sealed ice packs into the bin first, or even 2l coke bottle full of tap water would do. Add enough water for your pump to function. The change of state occurring as either of these two melts will soak up huge amounts of energy before the bin starts to warm up - and forms a mirror image of the state change occurring in the condenser.

It should also form a nice contained system that doesn't need reboxing to stop it getting broken when it takes a knock. It'll take zero intelligence or effort to put it together and be virtually free.

And now you have somewhere to stick all your stir bars.

Branded recirculating chillers are ridiculously expensive, yep.

[Edited on 1-5-2010 by peach]
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