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Silly question about TECs.

D

Daniel Pitts

Jan 1, 1970
0
Lets say I have two Thermoelectric coolers, each of which can create a
∆t of 60°c. Now, lets say I'm a mad scientist and decide to layer them
together, so that the cooling side of one is on the heating side of the
other. Have I in effect made a 120°c TEC, or did I just melt my carpet?
Or is it somewhere in-between 60° and 120°? (which is more like what I'd
expect). Or, is it just that it moves 60° twice as far?

If it actually does improve the cooling capacity, I'd expect diminishing
returns (since otherwise absolute 0k would be way too easy to achieve).
Is there a formula for this? I'd actually love to liquify air, just to
play around with (knowing of course how dangerous it can be without the
proper safety gear).

Thanks,
Daniel.

P.S. If the unicode doesn't come through as it should in your reader,
and you see some strange "junk" in my first paragraph: "∆" is "Delta",
and "°" is Degree.
 
J

Jasen Betts

Jan 1, 1970
0
Lets say I have two Thermoelectric coolers, each of which can create a
∆t of 60°c. Now, lets say I'm a mad scientist and decide to layer them
together, so that the cooling side of one is on the heating side of the
other. Have I in effect made a 120°c TEC, or did I just melt my carpet?
Or is it somewhere in-between 60° and 120°? (which is more like what I'd
expect). Or, is it just that it moves 60° twice as far?

one of the above, the cooler one puts out more heat than it takes in
so the hotter one has more work to do. if you're moving only a small
amount of heat at the cold end the hot end can probably keep up
If it actually does improve the cooling capacity, I'd expect diminishing
returns (since otherwise absolute 0k would be way too easy to achieve).
Is there a formula for this? I'd actually love to liquify air, just to
play around with (knowing of course how dangerous it can be without the
proper safety gear).

apparently you can do that with just dewar vessel and a compressor,
I don't know if you can do it with one from a hardware shop.
and yeah, liquid oxygen looks pretty dangerous.
 
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