| Electronics > Projects, Designs, and Technical Stuff |
| thermoionic cooling and thermotunnel cooling? |
| (1/2) > >> |
| coppercone2:
has anyone here worked with this kind of stuff? |
| Sceadwian:
Looks like it has little to no practical usage possibilities, certainly not for electronics. https://en.wikipedia.org/wiki/Thermotunnel_cooling |
| coppercone2:
the biggest problem is the 10nm flatness requirement, which is fulfilled by using piezeo actuators and making mated non calibrated surfaces using electroforming You can approach the flatness with lapping, but the requirement is something like 300 cesium atoms separation. I assume they make something as flat as possible and then use electroforming. You are right that thermoionic cooling has little use for conventional electronics, but thermotunnel can work at room temperature, if you can set the thing up right. The whole idea is that it can work at room temp. |
| Sceadwian:
To what effect? I've got no sense of this, would it be worth it? Peltier's were supposed to be the cat's pyjama's and not that they don't have their uses but they're a niche product. --- Quote from: coppercone2 on October 03, 2018, 02:07:25 pm ---the biggest problem is the 10nm flatness requirement, which is fulfilled by using piezeo actuators and making mated non calibrated surfaces using electroforming You can approach the flatness with lapping, but the requirement is something like 300 cesium atoms separation. I assume they make something as flat as possible and then use electroforming. You are right that thermoionic cooling has little use for conventional electronics, but thermotunnel can work at room temperature, if you can set the thing up right. The whole idea is that it can work at room temp. --- End quote --- |
| coppercone2:
It would be like 100 watt/cm squared cooling or better with a vacuum barrier between the hot and cold sides, so you would only have leakage radiation to reheat the cooled side. With a peltier you have the combined area of all the semiconductor junctions to act as a thermal shunt. I am not sure how carnot efficiency is related to the thermal leakage, or if its related at all, but it would be better. |
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