Sciencemadness Discussion Board
Not logged in [Login ]
Go To Bottom

Printable Version  
 Pages:  1  2
Author: Subject: Homebuilt re-circulating chiller pump
MagicJigPipe
International Hazard
*****




Posts: 1554
Registered: 19-9-2007
Location: USA
Member Is Offline

Mood: Suspicious

[*] 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...




"There must be no barriers to freedom of inquiry ... There is no place for dogma in science. The scientist is free, and must be free to ask any question, to doubt any assertion, to seek for any evidence, to correct any errors. ... We know that the only way to avoid error is to detect it and that the only way to detect it is to be free to inquire. And we know that as long as men are free to ask what they must, free to say what they think, free to think what they will, freedom can never be lost, and science can never regress." -J. Robert Oppenheimer
View user's profile View All Posts By User This user has MSN Messenger
Mr. Wizard
International Hazard
*****




Posts: 1040
Registered: 30-3-2003
Member Is Offline

Mood: No Mood

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


Here is a guy that made a quick and dirty refrigeration unit using propane.
http://home.earthlink.net/~lenyr/refrig.htm
He then went on to modify a refrigerator using propane. Lots of pictures and practical information.
http://home.earthlink.net/~lenyr/refrig2.htm
View user's profile View All Posts By User
F2Chemist
Harmless
*




Posts: 28
Registered: 30-6-2008
Member Is Offline

Mood: No Mood

[*] 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:

http://www.premiumaquatics.com/Merchant2/merchant.mvc?Screen...

Also, keep an eye out in the aquarium section of your local classifieds...you 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]
View user's profile View All Posts By User
peach
Bon Vivant
*****




Posts: 1428
Registered: 14-11-2008
Member Is Offline

Mood: No Mood

[*] 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]
View user's profile View All Posts By User
 Pages:  1  2

  Go To Top