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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

#31

Post by nandomrumber »

mort96 wrote: post #28
bluGill wrote: post #17

Earlier quoted context omitted.

They claim 75% better. I doubt this is better than compressors in general but they seem to be going for a niche where a high power compressor does the high load part but when only a litte cooling is needed the compressor is now very inefficient and so the peltier is better. Normal fridges just let the temperature have a wider swing which is good enough for most needs.

> Normal fridges just let the temperature have a wider swing which is good enough for most needs. These wide swings annoy me. You hear that you shouldn't let your fridge go above 4°C, because that's dangerous. And you obviously don't want your fridge to go below 0°C. But finding a setting where the hottest part of the fridge doesn't go above 4°C (or even 5°C or 6°C) during the hottest part of the cycle and the coldes…

Put a thermometer in a plastic bag (to keep it dry) in a jar of water in your fridge, you'll likely find the temperature of items inside the fridge much more stable than the air temperature.

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

#32

Post by nandomrumber »

palata wrote: post #30
mort96 wrote: post #28

Earlier quoted context omitted.

> Normal fridges just let the temperature have a wider swing which is good enough for most needs. These wide swings annoy me. You hear that you shouldn't let your fridge go above 4°C, because that's dangerous. And you obviously don't want your fridge to go below 0°C. But finding a setting where the hottest part of the fridge doesn't go above 4°C (or even 5°C or 6°C) during the hottest part of the cycle and the coldes…

> You hear that you shouldn't let your fridge go above 4°C Really? My fridge says 8°C, I think?

Between 3°C and 5°C is the recommended refrigeration temperature

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

#34

Post by moffkalast »

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…

15 is absurd, regular peltiers get like 1.05 at most don't they? That's like inventing the warp drive but for cooling.

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

#35

Post by iLoveOncall »

NuclearPM wrote: post #33
Tistron wrote: post #16

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

Why?

Not OP but it's a massive nuisance if you live in a studio. People don't realize how noisy a fridge is until there's one in the room that they sleep in.

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

#38

Post by 1oooqooq »

moffkalast wrote: post #34
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…

15 is absurd, regular peltiers get like 1.05 at most don't they? That's like inventing the warp drive but for cooling.

lol yeah they did not. it's right on the abstract.

> is ~15 for temperature differentials of 1.3 °C.

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

#39

Post by delusional »

duskwuff wrote: post #5
WarOnPrivacy wrote: post #2

I used peltier coolers on K6 processors 1M computer years ago. They worked great and lasted about as long as the PCs did. Not long after I bought mine, they disappeared from cooler offerings. I've wondered what became of the tech.

> I've wondered what became of the tech. Remember that Peltier coolers don't make heat disappear - they just move it from one side of the cooler to the other, and produce a lot of additional waste heat in the process. There are better ways of transferring heat from a hot IC to a heat sink nowadays - like liquid cooling for really high-performance systems, or capillary-action heat pipes for more typical needs.

> There are better ways of transferring heat from a hot IC to a heat sink nowadays

Peltiers were always a bad way to move the heat. What they offered was the ability to go below ambient, which at the time could improve overclocking. Peltiers of course lacked the capacity to actually take you there with any decent load, but in theory it could.

It never really made much sense for consumers, and once consumers realized that, the market went away.

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

#40

Post by userbinator »

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…

Delta Ts of 1.3°C.

Might as well not use a refrigerator if your ambient temperature is that low.

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