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

271–280 of 329 posts

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

#271

Post by colechristensen »

bluGill wrote: post #259
colechristensen wrote: post #224

Earlier quoted context omitted.

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/

While not wrong, that is very misleading - for the vast majority we already get plenty of vitamin C in our diet and we don't have the specific situations where enormous doses will be effective. At least vitamin C is water soluble: your body will almost always just pee out any extra quick so it is very hard to overdose. Those who have a kidney problem should check with a doctor, for the rest of us massive doses just m…

>for the vast majority we already get plenty of vitamin C

This is highly dependent on the population you're talking about. There are plenty of people around the world who don't have great nutrition and don't eat large amounts of fortified industrial food.

>for the rest of us massive doses just make our pee more expensive

The study I linked reported ridiculous doses of vitamin C "dramatically improved the clinical state and cardiovascular, pulmonary, hepatic and renal function" in ICU spesis patients. Like 200-400 grams of sodium ascorbate administered over 7 hours. The recommended daily nutritional consumption of vitamin C is around 80 milligrams.

There are other studies reporting other positive outcomes for large doses of vitamin C. This isn't a recommendation that you should take hundreds of grams every day yourself, but there is ample evidence in a clinical setting for "immune boosting" vitamin C in large doses. (and also criticisms of the daily value for being too low)

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

#272

Post by otikik »

mixcocam wrote: post #257
otikik wrote: post #211

Mandatory Technology Connections video about Peltier cooling, "Why Thermoelectric Cooling Is Inefficient": https://www.youtube.com/watch?v=CnMRePtHMZY

This video assumes that this technology will remain static over time. Peltier cooling could have a higher utility local maximum than currently used refrigerants.

The video did not make predictions about the future, it just presented the current reality at the time. I think it is still a good introduction to set the right expectations when encountering this technology.

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

#273

Post by otikik »

zevv wrote: post #229
otikik wrote: post #211

Mandatory Technology Connections video about Peltier cooling, "Why Thermoelectric Cooling Is Inefficient": https://www.youtube.com/watch?v=CnMRePtHMZY

Could you summarize the contents of this video so we don't have to watch it?

They are very inefficient

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

#274

Post by mousethatroared »

mousethatroared wrote: post #250
gsf_emergency_2 wrote: post #163

Earlier quoted context omitted.

I don't know how people can convince themselves that they can understand these effects. Unusually effective heat insulation is exactly how they work. (This is tempered by eg radiative losses, so making them thicker doesn't work better.) placing poorer heat (vs electrical) insulators between peltier material is counterproductive, similar to using resistors to improve conduction between copper wires Don't ask me for a…

What is exergy? The one time a mechanical engineering colleagues tried to explain it to me, he reached the wrong conclusion on the problem we were working on. I haven't seen it in any physics thermodynamics book, and only mech eng. seem to know what it is, and then only in the US. Faires (undergrad MIT Thermo book from the 50s) makes no mention of it as far as I can tell.

@tlocke

But that isn't a mathematical expression. At best, it would appear to be energy * maximum_Carnot_efficiency (for heat engines anyway)

But it seems not to be adding very much, since Carnot efficiency depends on delta_(T). The OPs point that exergy doesn't depend on T is tautological since T has already been accounted for by the Carnot expression.

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

#275

Post by SketchySeaBeast »

amelius wrote: post #233
Tistron wrote: post #16

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

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.

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

#276

Post by pantalaimon »

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…

> you shouldn't let your fridge go above 4°C, because that's dangerous.

Dangerous how?

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

#278

Post by tenthirtyam »

Seb-C wrote: post #247
SchemaLoad wrote: post #144

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

I purchased a book the other day, and when I turn the pages, it automatically shows me the text that I want to read. It must be powered by AI.

Ah, you've discovered the Built-in Orderly Organised Knowledge device [1]. Juse wait until you dicover PENCILS!

[1] https://cool.culturalheritage.org/byorg/abbey/an/an21/an21-8...

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

#279

Post by bee_rider »

cactusfrog wrote: post #155
SchemaLoad wrote: post #144

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

My process control theory textbook has a chapter on neural networks and a lot of the language in control theory has an AI like tinge to it. I think this AI language is native to control theory so it might not be as overblown as it first sounds.

I firmly believe control theory folks didn’t invent LLMs only because the idea of doing a big fit on everything sounds too much like a joke they were telling each other.

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

#280

Post by throwawayoldie »

SchemaLoad wrote: post #147
throwawayoldie wrote: post #111

Earlier quoted context omitted.

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.

It may be hard to believe, but software used to be a fun, intellectually satisfying field.
Post reply on HN