Difference between revisions of "Diamondoid heat pump system"
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| − | Heat pumps for reaching liquid nitrogen or helium temperatures can probably be easily created. | + | Heat pumps for reaching liquid nitrogen or helium temperatures can probably be easily created. |
| + | They could be made into desktop scale devices with nothing more than a power connection | ||
| + | or more importantly integrated into nanofactories to gain more reliable operation with lower error rates. | ||
| − | + | The '''air refrigeration cycle''' also known as Bell Coleman cycle or reverse Brayton cycle | |
| − | + | (see: [http://en.wikipedia.org/wiki/Heat_pump_and_refrigeration_cycle heat pumps in general] and "[http://www.docstoc.com/docs/123572307/4_Reversed_Brayton_Cycle gas cycle diagram]" ) | |
| − | + | is nice for diamondoid AP systems since high compression ratios are easily archivable | |
| − | + | and liquid nitrogen temperatures can be archived just by using ambient air | |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | A classical gas cycle is like follows: | |
| − | + | # compress gas in thermal contact to the heat radiator to fluid densities (around ~1000bar) | |
| − | + | # let the generated compression heat dissipate into the environment | |
| − | + | # transport compressed gas inside through the thermal isolation layer | |
| − | + | # expand gas in thermal contact to the isolated volume | |
| − | + | # let the now absent expansion heat be filled from the chamber | |
| + | # transport expanded gas throug isolation layer | ||
| + | # repeat the cycle | ||
| + | |||
| + | To reach liquid hydrogen or helium temperatures | ||
| + | the compressed hydrogen/helium must be cooled below its inversion point | ||
| + | or else gas will will heat up instead of cooling down when expanded. | ||
| + | A two stage design with good thermal contact is then needed. | ||
| + | |||
| + | Gasses can be handled safely (without explosion hazard) in small small DMME capsules with lockable pistons | ||
| + | When oxid-ceramic diamondoid materials are used dry air instead of pure nitrogen should be safely usable. | ||
| + | |||
| + | To keep the capsules small in spite of the high compression ratios the capsules could employ three pistons conecutively | ||
| + | each compressing the enclosed gas at a factor ten. | ||
| + | |||
| + | Since the capsules must be moved between two locations seperated by macroscopic distance | ||
| + | the design (and the process steps) will be spread over multiple [[microcomponents]] | ||
| + | |||
| + | The most difficult part is the thermal thermal isolation layer since diamond is pretty much the worst thermal isolator conceivable. | ||
Revision as of 22:28, 27 January 2014
Heat pumps for reaching liquid nitrogen or helium temperatures can probably be easily created. They could be made into desktop scale devices with nothing more than a power connection or more importantly integrated into nanofactories to gain more reliable operation with lower error rates.
The air refrigeration cycle also known as Bell Coleman cycle or reverse Brayton cycle (see: heat pumps in general and "gas cycle diagram" ) is nice for diamondoid AP systems since high compression ratios are easily archivable and liquid nitrogen temperatures can be archived just by using ambient air
A classical gas cycle is like follows:
- compress gas in thermal contact to the heat radiator to fluid densities (around ~1000bar)
- let the generated compression heat dissipate into the environment
- transport compressed gas inside through the thermal isolation layer
- expand gas in thermal contact to the isolated volume
- let the now absent expansion heat be filled from the chamber
- transport expanded gas throug isolation layer
- repeat the cycle
To reach liquid hydrogen or helium temperatures the compressed hydrogen/helium must be cooled below its inversion point or else gas will will heat up instead of cooling down when expanded. A two stage design with good thermal contact is then needed.
Gasses can be handled safely (without explosion hazard) in small small DMME capsules with lockable pistons When oxid-ceramic diamondoid materials are used dry air instead of pure nitrogen should be safely usable.
To keep the capsules small in spite of the high compression ratios the capsules could employ three pistons conecutively each compressing the enclosed gas at a factor ten.
Since the capsules must be moved between two locations seperated by macroscopic distance the design (and the process steps) will be spread over multiple microcomponents
The most difficult part is the thermal thermal isolation layer since diamond is pretty much the worst thermal isolator conceivable.
