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2019-05-15 14:56 by Karl Denninger
in Stupidity , 120 references Ignore this thread
LOL..... Not New and Stupid
[Comments enabled]

Phononics on CNBS right now.

Peltier junctions are not new -- but they're claiming it is.

Why are not they used everywhere?

EFFICIENCY.

Thermoelectric junctions are about one quarter the energy efficiency of conventional compression-cycle units.

In other words on a Carnot-cycle basis a traditional system can manage to get into the ~50% range -- thermoelectric junctions run at 10-15% of theoretical efficiency!  This is why they're not widely-used; they make zero sense on an economic basis due to their much higher energy consumption.

CNBS of course puts these so-called "revolutionaries" on their show but there is nothing revolutionary about what they have.  Peltier-junction coolers have been available for a very long time and in fact you can buy them in the form of a cooler (you know, like an Igloo cooler?) right here and now.

Like, for example, right here:

https://www.walmart.com/ip/Coleman-40-Quart-PowerChill-Thermoelectric-Cooler-with-Power-Cord/21156022

inline

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Maynard
Posts: 1150
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gig harbor wa
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This is funny. I actually have one of those and traveled 7k miles with it plugged in. Keeps things 30 degrees cooler below atmospheric temp and I like it but this is just another "green" ploy.
Tickerguy
Posts: 157221
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A True American Patriot!
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Yep.

They're not bad for what they are; being solid-state you can bash them around without much concern and they're reversible, so if you have a cool place you can keep things warmer. Their delta between hot/cold can reach 50F but efficiency goes to Hell at wider variations; 30F is more-reasonably expected. You CAN "stack" them to get better differentials but at the cost of (even much worse) efficiency, if you really need to.

But as a replacement for conventional mechanical refrigeration? Only if the power is literally FREE, and it never is!

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Whossane
Posts: 51
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Karl,

Check out the data sheet for their undercounter refrigerator.
The refrigeration system is listed as: Redundant + Solid State Semiconductor
It also has R744 and R718 refrigerant and a heat pump. ????
Are they using that to cool the solid state heat exchanger?
Inline
Tinman
Posts: 419
Incept: 2008-02-16

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They were awesome for running CPU's out of spec in the 90's (think Celeron 300a). You needed a separate PS and gigantic heat sinks or water on the hot side. I can't believe how stupid these reporters are. This was invented early 1800's and they are the only way deep probes can function.
Tickerguy
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@Whossane -- smiley

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Copernicus-usdd
Posts: 50
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Houston TX
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Shocker that they sell to the medical market...the coleman in your link goes for $79...phononics sells " medical refrigerators" for $2,000 to pharmacies and hospitals....they couldn't care less about cost...or efficiency.

The standard peltier module in that coleman goes for about $1 wholesale....but that's not the whole story...you'll spend another $30 on a decent heat sink and power supply and it still won't cool worth a damn compared to a compressor refrigerator....not that the coleman has a decent power supply or heat sink :)

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Krzelune
Posts: 6580
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Slap a red Cross sticker on your Coleman and sell it to the hospital for the low price of $1,500.
Gauntlet33
Posts: 109
Incept: 2009-03-30

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My dad is originally from Argentina and he used to say that their media would run stories to distract from real problems like their ****ty economy and politics.

That the US media is doing the same is just further proof that we're becoming a banana republic too...
Redjack
Posts: 151
Incept: 2018-01-29

Iowa
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The three laws of thermodyamics.

You can't win
You Can't break even
You can't quit

Amazing how many forget that.
Thomasblair
Posts: 120
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NC
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@redjack

Zeroth law: there's a game and you have to play
Wifi
Posts: 1334
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Seagrove Beach
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No electric needed


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