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Messages - Arima

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Policy and solutions / Re: Batteries: Today's Energy Solution
« on: September 20, 2018, 08:10:01 PM »
Refrigerators are kind of a inverse battery  :)

What would be really cool (pun intended) is solid state (magnetic?) refrigeration. In Texas it's the #1 user of electricity. Solid state refrigeration could cut emissions of refrigerants gases, reduce electrical demand, potentially last longer and provide affordable A/C and refrigeration to developing nations.

https://newatlas.com/magnetic-cooling-shape-shifting-alloy/56379/
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Magnetic cooling systems work by exploiting the magnetocaloric effect – which basically means that certain materials will change temperature when exposed to a magnetic field. The technology has been around almost as long as conventional fridges, but has never really taken off because device complexity can ruin energy efficiency. The problem is often the superconducting magnets used, which require their own cooling system.

To get around that problem, researchers from Technical University Darmstadt and the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) in Germany used a unique combination of magnets and special alloys. The magnets contain the rare-Earth metal neodymium, as well as iron and boron. The alloy is a mixture of nickel, manganese and indium.

That combination is key to making the system practical. Those magnets are the strongest permanent magnets currently known, capable of generating magnetic fields 40,000 times stronger than that of the Earth. That particular alloy, meanwhile, will cool down when exposed to a magnetic field and, in addition, it can return to its original shape after being deformed.


While this is overkill for commercial use it does show the potential.

All-solid-state cryocooler becomes a reality
https://www.lanl.gov/discover/news-stories-archive/2018/August/0821-cryocooler.php
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Markus Hehlen and collaborators have — for the first time — demonstrated an all-solid-state optical refrigerator that operates at cryogenic temperatures and has no moving parts.

This might go in the category of things like affordable fusion power and flying cars but technology marches on.

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