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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

#141

Post by throwawayoldie »

hoherd wrote: post #132
throwawayoldie wrote: post #98

> Bespoke AI Hybrid Refrigerator Come the fuck on.

Seriously. When I see this kind of absurdity, I think of Humpty Dumpty in Through The Looking Glass: > 'When _I_ use a word,' Humpty Dumpty said in rather a scornful tone, 'it means just what I choose it to mean--neither more nor less.' > 'The question is,' said Alice, 'whether you CAN make words mean so many different things.' > 'The question is,' said Humpty Dumpty, 'which is to be master-- that's all.' > Alice was…

If Mr. Dumpty were alive today, he'd be enjoying a brilliant career as a corporate executive.

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

#142

Post by hn_go_brrrrr »

lucb1e wrote: post #127
obfuscator wrote: post #68

Earlier quoted context omitted.

Why should that be dangerous? I have never heard that. I have always had my fridge at 8°C and never had something dangerous happen to me. I have never come across fridges that were way cooler, apart from fridges of friends in Canada and the US. What's the reasoning?

The recommendation I've always heard in the Netherlands is 7°C, it's more recent that I've been seeing 4°C on meat packaging in Germany (where I live now). I doubt anyone's fridge is consistently at or below 4° without freezing things constantly, so I've been assuming this is wishful thinking and/or ass-covering on the manufacturer's part and not what anybody actually does. Your 8°C is close enough that it probably m…

> I doubt anyone's fridge is consistently at or below 4° without freezing things constantly.

My refrigerator is typically between 3-4°C, never had any problems with things freezing.

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

#143

Post by exhilaration »

lightedman wrote: post #136
mousethatroared wrote: post #78

Earlier quoted context omitted.

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.

They're already doing great. I have a portable neck AC unit that uses peltiers and it keeps my head and neck cool in otherwise nasty desert conditions when mining. Yes the radiative heating from the sun is still a bitch but a hat basically minimizes that, and also redirects the partially-chilled air more efficiently around my head and face. The direct-contact neck cooling plates are an absolute lifesaver. Keep the su…

Sounds cool :-) I think we'd forgive you for providing a direct link to this product.

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

#145

Post by SchemaLoad »

athenot wrote: post #116
Tistron wrote: post #16

What I want is a silent refrigerator, will this bring that? pray

My wine fridge uses Peltier and is super quiet. It's the perfect application for this because wine doesn't need to be as cold as a normal fridge, and noise is a consideration. It's not completely silent though, there's a small PC-like fan but it's way less loud than a compressor.

You might be able to swap that fan out for a higher quality one like a noctua.

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

#146

Post by SchemaLoad »

gettingoverit wrote: post #139
BearOso wrote: post #8

AI has literally nothing to do with this. Why do they feel the need to sprinkle the phrase everywhere? AI inverter/compressor? Come on, have some sense of shame, please.

Actually AI has a lot to do with material design. I can't do a proper explanation, so please bear with this information dump: - We don't have a strong physical theory for solid state physics. Quantum stuff doesn't scale well from 1 atom to a mole of atoms, because 10^23 goes into the exponent of number of energy levels in the system, and then we also have to model interaction of those levels. - Physical properties of…

What the article is talking about is using temperature probes and deciding if to run the compressor or peltier, or both depending on the temperature. That's what they are calling AI. Some if statements on a microcontroller.

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

#147

Post by SchemaLoad »

throwawayoldie wrote: post #111
koakuma-chan wrote: post #50

Earlier quoted context omitted.

Much like a hybrid vehicle, this system intelligently switches between the two cooling methods depending on what best suits the situation.

So...it has a microcontroller. Impressive! /s

Have a look at any product marketing these days. Desktop motherboards are calling the fan curve settings AI cooling. Everything that a computer does now, even if it's done it for 30 years is now AI.

It's somehow worse than Blockchain ever was.

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

#148

Post by Gigachad »

BearOso wrote: post #8

AI has literally nothing to do with this. Why do they feel the need to sprinkle the phrase everywhere? AI inverter/compressor? Come on, have some sense of shame, please.

Maybe it’s hooked in to ChatGPT

“You are a refrigerator, examine this photo of the temperature reading and decide (y/n) if the compressor should turn on”

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

#149

Post by BobbyTables2 »

jfengel wrote: post #112
mousethatroared wrote: post #78

Earlier quoted context omitted.

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.

The idea was just so astonishing that I ordered some from American Science and Surplus. I connected the leads to a battery and poof, one side got hot and the other got cold. Blew my mind. I didn't actually have a use for it. It was just neat that it actually worked. I understand the basic physics of it perfectly well. It's just one of those things where you expect basic physics to be overwhelmed by friction or someth…

Had a similar experience myself.

The thinness of Peltier devices bothers me. Amazing temperature differences… without any room to insulate such!

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