Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

Staying cool without refrigerants: Next-generation Peltier cooling

news.samsung.com

Post reply on HN
Print view View original

321–329 of 329 posts

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

#321

Post by IAmBroom »

raxxorraxor wrote: post #295
otikik wrote: post #273

Earlier quoted context omitted.

They are very inefficient

I think there are some applications though. I remember PWMing a peltier element to cool something to more or less exactly 35°C. I didn't need to be efficient cooling, it just needed to be reliable under space constraints. I am no hardware guy and I remember there was a giant heatsink despite the constraints. It was some kind of photosensor + lamp if I remember correctly. I think there was also some software logic to…

Obviously there are applications. There's one on my CPU.

The question is: Are there large-scale applications?

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

#322

Post by IAmBroom »

bluGill wrote: post #262
achow wrote: post #244

Earlier quoted context omitted.

[dead]

How much of that is because of fundamental limitations, and how much just the best we can do with current technology but more effort could solve?

"In theory, with perfect conditions and very low current, a COP between 1 and 2 might be achieved".

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

#323

Post by Hackbraten »

JTbane wrote: post #293
Incipient wrote: post #219

Earlier quoted context omitted.

Edge devices are problematic. I want to outsource the risk and decrease capex (and just hope opex works out). CloudFridge.

sorry, us-west-1 went down for 6 hours and my milk spoiled

Definitely has "Unauthorized Bread" vibes.

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

#324

Post by lucb1e »

hn_go_brrrrr wrote: post #142
lucb1e wrote: post #127

Earlier quoted context omitted.

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.

Crazy, I'd think the fluctuations would be way too big. How long does it normally run for when it does a cooling cycle? Is that temperature throughout the fridge or only on certain shelves?

Ours (well, our landlord's) runs very consistently for 40 +/- 3 minutes, with just over 1h30min in between during normal use, or 1h54min if it was closed the whole time (like at night). The temperature of products, as measured with a cheap infrared thermometer that's probably off like 10%, varies between 2 and 7 degrees, but it's not very consistent between shelves (top seems warmer but then the very bottom one, that is only half deep, is as warm as the top again). The products I checked have all been in there for days; reflectivity may be part of the difference, not sure. I don't know what the air temperature difference is at the beginning and end of a cooling cycle though

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

#325

Post by cyberge99 »

marcosdumay wrote: post #299
simonebrunozzi wrote: post #281

Earlier quoted context omitted.

AFAIK, no one has tried to build a Peltier cell paired with a heat pump. I am not an expert, but I would imagine that it's a path that could bring higher efficiencies. Thoughts?

It's one of those cases where you can chase a very small relative gain by adding a lot of complexity.

Like horsepower.

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

#326

Post by amelius »

SketchySeaBeast wrote: post #275
amelius wrote: post #233

Earlier quoted context omitted.

Simplest solution would be to have a compressor that is only active e.g. during the day (when the user is not at home).

But the user doesn't open the door when they aren't at home.

There will be greater fluctuations of temperature but that doesn't need to be a problem.

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

#327

Post by tripzilch »

Fokamul wrote: post #216

AI hi guys, pretty great AI article about this AI Peltier AI cooling AI tech. Really looking AI forward for another AI Samsung new AI devices. Best regards, AI Ps.: AI

I heard it was trained on stolen refrigerators that were for research purposes only!

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

#328

Post by obfuscator »

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…

Thanks for that explanation!

The Mindesthaltbarkeitsdatum is the deadline to which the item may still be sold by the vendor, iirc.

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

#329

Post by hn_go_brrrrr »

lucb1e wrote: post #324
hn_go_brrrrr wrote: post #142

Earlier quoted context omitted.

> 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.

Crazy, I'd think the fluctuations would be way too big. How long does it normally run for when it does a cooling cycle? Is that temperature throughout the fridge or only on certain shelves? Ours (well, our landlord's) runs very consistently for 40 +/- 3 minutes, with just over 1h30min in between during normal use, or 1h54min if it was closed the whole time (like at night). The temperature of products, as measured wit…

It's closer to 2-3°C in the drawers at the bottom and 3-4°C at the shelves at the top. However, it's very consistent otherwise.

I can't tell you how long it runs for because the compressor is too quiet for me to hear, sorry. Maybe if I had an energy monitor on it. Sounds like a fun idea.

Post reply on HN