# Tag Info

Accepted

### Do liquid hydrogen-based cooling devices exist and what are they used for?

The combustion chamber and nozzle of the Space Shuttle main engine were cooled with liquid hydrogen. Liquid hydrogen was also the fuel. It was used as a coolant before it was burned (regenerative ...
• 1,045

### Do liquid hydrogen-based cooling devices exist and what are they used for?

Gaseous hydrogen is often used to cool the large generators in power plants. "Hydrogen’s low gas density, high specific heat, and high thermal conductivity" are listed in the GE link as the major ...
• 394
Accepted

### Can a Peltier's device (i.e.Thermoelectric cooler) achieve cryogenic temperature efficiently?

There is no way to get around the physics in this case. The fundamental issue here is that peltier effect refrigerators are individually extremely inefficient, and stacking them in essence "stacks" ...
• 12.2k

### Does a tank of liquid nitrogen increase in total internal energy after emptying?

Internal energy is a measure of the distribution of translation, rotation, and vibration in the molecules. A liquid has far less in translational and rotational energy per molecule. As proof, ...
• 2,855

### Can a Peltier's device (i.e.Thermoelectric cooler) achieve cryogenic temperature efficiently?

Does the stacking of peltiers device shows promising results in achieving the cryogenic temperature? If you consider actually working in devices that are working in satellites to be "promising", then ...
• 2,228
1 vote

### Heat rate through composite wall with non-constant thermal conductivity

You are after a method to reduce a position or temperature variation in thermal conductivity to one value over the entire object. You want to substitute this one value into series + parallel thermal ...
• 2,855
1 vote

### Which materials we can use for storing liquid nitrogen?

If you like living, do not attempt to build your own high-pressure LN2 tank if you have never designed commercial-grade pressure vessels before. Use this.
1 vote
Accepted

### Polycarbonate as a short-term cryo-tank?

Short answer is no, as other commenters have suggested. The best solution is a small Dewar flask, which is stainless steel. Depending on how much you need, a commercial Thermos could do in a pinch. ...
• 126
1 vote

### Liquifying nitrogen using Joule–Thomson effect

If I am not mistaken the answer to your first question would be none. $\mu_{JT} = \frac{\partial T}{\partial p}|_H$ shows that that the conversion takes place under circumstances with no change in ...
• 1,704
1 vote

### Looking for best material for a cryogenic ball mill cup and balls

I debated between Answer or Comment on this, but ultimately I think it is more of an answer - albeit an imperfect answer. It sounds to me like the primary problem you are trying to solve is ...
• 363
1 vote

### Looking for best material for a cryogenic ball mill cup and balls

If cost isn't an extreme object, then hou might have lowest contamination by using a Co+WC makeup for your balls, and use a cryoplastic cup to avoic abraiding between balls & cup. The WC is ...

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