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Staying cool without refrigerants: Next-generation Peltier cooling

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Re: Staying cool without refrigerants: Next-generation Peltier cooling

#221

Post by GuB-42 »

mousethatroared wrote: post #78
fghorow wrote: post #27

For those worried about tiny COPs from these gizmos, trawling through the actual paper -- as well as the PR from JHU APL -- in this HN post [1] shows claims of COPs of ~15 for Delta Ts of 1.3°C. A compressor based cooler gets a COP of about 4 in the real world. I'm pretty sure this is an apples to oranges comparison to an expert (I am not one of those) but a factor of 3+ increase in COP is fairly noteworthy -- if it…

COP has to be compared at the same delta T. The COP of a loss less refrigerator is infinite at Delta T = 0 And you dont get to stack Peltiers to increase COP, only to increase delta T. Still, Peltiers are super cool and I have some ideas for their use od they get slightly better. Advances are super welcome.

> Still, Peltiers are super cool

I'd say they are super hot, but it depends from which side you look at it.

Re: Staying cool without refrigerants: Next-generation Peltier cooling

#222

Post by eru »

raxxorraxor wrote: post #213
Onavo wrote: post #165

Earlier quoted context omitted.

I mean yes, that's what reinforcement learning is.

I always thought my software PID controller with 512kb main memory is quite smart. Pure AI in my opinion.

That's quite a lot of memory for a little PID controller, isn't it? But I guess these days, they already only cost pennies, so you wouldn't save much from going for even less memory?

Re: Staying cool without refrigerants: Next-generation Peltier cooling

#223

Post by colechristensen »

maeln wrote: post #217
vasco wrote: post #191

Earlier quoted context omitted.

But zero web 2.0 references so we can rejoice.

Nah the new buzz was the Web 3, Web 2.0 is sooo 2010

Web 3 was blockchain nonsense "everywhere" and the buzz has died because the only people who want blockchains are speculators, money launderers, and niche boring users like nightly settlement of inter-bank accounts.

Re: Staying cool without refrigerants: Next-generation Peltier cooling

#224

Post by colechristensen »

GuB-42 wrote: post #218
qart wrote: post #180

Earlier quoted context omitted.

Just a few years ago, the buzzwords were "germicidal", "immunity boosting", "anti-bacterial", etc. for every damn thing, especially in India, where marketing can get away with bizarre claims.

Is there anything that is proved to be "immunity boosting" apart from vaccines? Well, and germs of course. Germs will cause an immune response, but that's probably not the kind of "boost" you are interested in. As for AI, I guess it is sufficiently vague and also not a medical claim, so you can put it everywhere. But because it is just as vague for consumers, is it even worth something for marketing?

Depends on your definition of "boosting". Vitamin C is essential for plenty of immune functions and a deficiency has serious effects on immunity. Enormous doses of Vitamin C have been shown to be effective in various scenarios as well. https://pmc.ncbi.nlm.nih.gov/articles/PMC8239596/

Re: Staying cool without refrigerants: Next-generation Peltier cooling

#225

Post by maeln »

colechristensen wrote: post #223
maeln wrote: post #217

Earlier quoted context omitted.

Nah the new buzz was the Web 3, Web 2.0 is sooo 2010

Web 3 was blockchain nonsense "everywhere" and the buzz has died because the only people who want blockchains are speculators, money launderers, and niche boring users like nightly settlement of inter-bank accounts.

And it was sprinkled everywhere, like sesame seeds on burger, just like Web 2.0 in the 2010 and AI now :) . We just need a Web 3 blockchain Web 2.0 AI FinTech startup

Re: Staying cool without refrigerants: Next-generation Peltier cooling

#226

Post by yehoshuapw »

Cthulhu_ wrote: post #199
veunes wrote: post #186

Earlier quoted context omitted.

"AI" has become the seasoning you sprinkle on anything to make it sound futuristic

I wonder if there's a site that keeps track of these. It was crypto before, then ML, for a while a lot of job openings seasoned their text with IoT, etc.

so long as it isn't about ai based crypto running on IoT, not interested

Re: Staying cool without refrigerants: Next-generation Peltier cooling

#227

Post by thesz »

veunes wrote: post #186
SchemaLoad wrote: post #144

This article uses the term AI 5 times to talk about basic microcontroller sensor readings.

"AI" has become the seasoning you sprinkle on anything to make it sound futuristic

"AI" has become the seasoning you sprinkle on anything to make it sound contemporary.

Re: Staying cool without refrigerants: Next-generation Peltier cooling

#228

Post by user_7832 »

falcor84 wrote: post #214
Calwestjobs wrote: post #137

Earlier quoted context omitted.

and COP 15 is measure at 1.3'C temperature difference towards outside of fridge, so if it is 80f in your home then good luck to your lettuce.

Why, what would happen to my lettuce if I set the thermostat near the cooling element to e.g. 3°C and have the cabbage be somewhere between that and 4.3°C?

Unless I'm very mistaken, this 1.5 degree delta is between the hot side (the condenser at almost your room temp) and the cold side (evaporator inside the fridge).

That is, if you want to chill your cabbage to 4.3 degrees C, your room temp should be not more than 5.6 degree C. Or... if it's 25 degrees outside, in an ideal case your cabbage is 23.7 degrees cool.

Btw, max theoretical COP increases rapidly as T'hot - T'cold shrinks to zero. Your practical AC or fridge delta T is much more than that, depending on the weather.

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