Dear Hannes,
There is a company in Richmond VA, MacroSonics (spelling may be wrong) that has sonic compressors

Erich

Hay Hannes, we kNOw wHo YoU aRe. You wOrK fOR EMBRACO. dONt YUo?

Hi, I'm doing a school project and I'm using a Peltier device in an esky to heat and cool water. Have u guys got some suggestions on better ways of heating and cooling about 6-7L of water?

[quote="Anonymous"]Dear Hannes,
Guest is excited about coolchips because, the claim goes, coolchips work on the quantum mechanical principle of electron tunneling (and Guest probably is also a stockholder). Quantum theory predicts that enough electrons in a "low work" material subjected to a current will cross evacuated gaps of 10nm or less and carry enough heat with them to create cooling below ambient temperatures. I believe this method of solid state cooling is not in your original list.
Sincerely, Another Guest[/quote]Ok Guest. Please identify you as guest 1 or 2 :) So the many guest may know to whom I'm addressing my questions :) Then we have one more technology

- Thermionic (who is developing this ? Dr Shakouri ?)
- Quantum electron tunneling (Coolships)
- Thermoelectric (many)
- Magnetocaloric (Astronautics)
- Electrocaloric (Ceramphysics)
- Laser cooling (Argonne National Lab)
- etc...

I'm wondering if there are many others technologies we never heard about... that are also solid state, use electric or magnetic fields and/or currents for cooling purposes.

Sincerely,
Hannes

Dear Hannes,
Guest is excited about coolchips because, the claim goes, coolchips work on the quantum mechanical principle of electron tunneling (and Guest probably is also a stockholder). Quantum theory predicts that enough electrons in a "low work" material subjected to a current will cross evacuated gaps of 10nm or less and carry enough heat with them to create cooling below ambient temperatures. I believe this method of solid state cooling is not in your original list.
Sincerely, Another Guest

[quote="Hannes"]how about the Qantum tunneling thermocouples of Cool Chips plc.[/quote]Dear Calserv, I would suggest you a stirling cooling device, with that its relativelly easy to go to -80C. But it's as compact as a thermoionic solid state device. Regarding your question Guest, I understand that Cool Chips work with termionic devices.... this I already know a little bit, I was wondering about new refrigeration devices, different than those I suggested....

Sincerely, Hannes :D

how about the Qantum tunneling thermocouples of Cool Chips plc.

how about the Qantum tunneling thermocouples of Cool Chips plc.

how about the Qantum tunneling thermocouples of Cool Chips plc.

Dear Hannes, We are also interested in new ways of achieving refrigeration. Our aim is to get to -80C or lower, how about you?

Dear Calserv,

I'm sorry for answering you so late :( I must have not seen your question before....

We actually only develop compressors for L/M/HBP applications (lowest we can go is around -30C). I don't have any experience going down to -80C, but my oppinion is that for your case a stirling kind of compressor would be the most efficient or you could use some 2 stage compressors to achieve this temperatures (for the low temperature stage you have to change the refrigerant - maybe etilene or CO2 - check this out http://www.icecoldcomputing.com ). It always depends on the size of equipment you wanna build.

I would check sunpowers website, they use the stirling cycle and cool down to -230C!!! (see http://www.sunpower.com/products/m77.html ).

Another possibility could be pulse tube....

Hope that helps you a bit ;)

Sincerely,
Hannes

[quote="CALSERV"]Dear Hannes, We are also interested in new ways of achieving refrigeration. Our aim is to get to -80C or lower, how about you?[/quote]

Thanks a lot Erich,

Is this a tecnology like thermoacoustics which uses also high power sound waves to generate cold ? Do you have some more information regarding this company ? I couldn't find anything :(

Sincerely,
Hannes

[quote="Anonymous"]Dear Hannes,
There is a company in Richmond VA, MacroSonics (spelling may be wrong) that has sonic compressors

Erich[/quote]

Yes, I work at embraco here in Brazil! We are a major compressor industry, but we are interested in all kind of alternative ways of producing cold, we love to understand this technologies so that we might identify oportunities in the present days and future. Its also a good way to start contacting the guys in the field that are developing this technologies and chatting with them trying to understand the physics and thermodynamics behind this tecnologies.

Do you work in some of this alternate technology fields too ?

Sincerely,
Hannes

Hi anonymous,

I would say that if you don't care about efficiency a thermoelectric modules arranged in an intelligent way would do it (you can buy them at e-bay for pennies). If you plan to do something really efficient I would use a compressor based system.

Hope you can do something nice, keep us posted with the results!!

Sincerely,
Hannes

[quote="Anonymous"]Hi, I'm doing a school project and I'm using a Peltier device in an esky to heat and cool water. Have u guys got some suggestions on better ways of heating and cooling about 6-7L of water?[/quote]