Using a Solid-State Elastocaloric Cooler to Freeze Water
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Using a Solid-State Elastocaloric Cooler to Freeze Water
Elastocaloric materials are a class of materials that exhibit a big change in temperature when exposed to mechanical stress. This could potentially make them useful as solid-state replacement for both vapor-compression refrigeration systems and Peltier coolers.
The entire assembled elastocaloric device. (Credit: Guoan Zhou, Nature, 2026)
So far one issue has been that reaching freezing temperatures was impossible, but a recently demonstrated solution (online PDF via IEEE Spectrum) using NiTi-based shape-memory alloys addressed that issue with a final temperature of -12°C achieved within 15 minutes from room temperature.In the paper by [Guoan Zhou] et al. the cascade cooler is described, with eight stages of each three tubular, thin-walled NiTi structures. Each of these stages is mechanically loaded by a ceramic head that provides the 900 MPa mechanical stress required to transfer thermal energy via the stages from one side to the other of the device, alternately absorbing or releasing the energy with CaCl2 as the heat-exchange fluid.
NiTi alloys are known as about the ideal type of SMA for this elastocaloric purpose, so how much further this technology can be pushed remains to be seen. For stationary refrigeration applications it might just be the ticket, but we’ll have to see as the technology is developed further.
Gli ultimi otto messaggi ricevuti dalla Federazione
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Giuli spende trenta milioni nostri per un Caravaggio....meloni urla anche stavolta?
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I enjoyed and appreciated reading this post.
"I realized almost immediately that GNU/Linux and FreeBSD were so similar they were completely different."
This right here.
My initial impression with #FreeBSD in 2006 was quite similar. Of course, #Linux back then was a much different beast than what it has evolved (mutated?) into today.
Had I not pursued Linux system administration as a career, I *probably* would have stuck with FreeBSD.
We can make all the technical comparisons between the two OSes all day long but what drove my interest and enthusiasm are (1) the documentation and (2) the community.
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@peacelink ma non sono riuscite ad evitare di sbavare mentre lo dicevano
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@stefano Don’t bother filing a bug report. They will act stupid. Probably they are stupid about it. They think it is a bug. Actually the author probably wrote a program he knew was not a solution to the problem but which he could do on deadline and which was good enough for his job at HP.
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@stefano Here is something new for you to be upset about, though, which affects everyone, Linux, BSD, illumos alike. I have been upset about it for over 20 years.
Read ‘man 5 fonts-conf’ or whatever your equivalent is. Read it carefully under ‘FONT MATCHING’. What it says is that a font is not chosen as you wished, but instead RANDOMLY. You are only LUCKY if you get the font you wished.
And if you experiment long enough you will find this is true.
Fontconfig is unfixable and must be scrapped.
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L'Ucraina ha sviluppato nuovi missili balistici FP-7, analoghi all'ATACMS, ma due volte meno costosi
I test si stanno muovendo verso una nuova fase, i missili saranno testati direttamente in attacchi in Russia
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E in omaggio la concessione decennale per l'uso di un pezzo di bosco demaniale.
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@quinta non solo lo fa, ma se ne vanta pure.
