Thermoelectric Device Demonstration Peltier Effect - Cooling

[dking802]

@MrInfinity2088: This heat sink was a standard computer CPU heat sink. You can pick them up at most stores that carry desktop computer parts like CPUs and motherboards, etc. I believe this one was just taken out of an old, discarded computer. (Recycling is always good!) As for attachment: yes, best to use some thermally conductive adhesive to ensure good heat transfer.

[MrInfinity2088]

Would you recommend attaching the thermoelectric device to the heatsink with thermal compound?

[MrInfinity2088]

Where did you get that heatsink at?

[dking802]

If you stack one device atop another, using twice as much power, you may be able to get the cold side of the top device a bit colder initially because you will be actively cooling the hot side of that device, thus decreasing the amount of heat that can diffuse back to the cold side. As you continue to operate the stacked device, I imagine the difference between stacked and single device would decrease unless you were rejecting heat fast enough from the large heat sink you see beneath this one.

[YamiPoyo]

What happens if you attach one peltier device to another?

[gonioelect]

Which TEC module you are using,and what is the temperature difference it produce?

[dking802]

@gonioelect Hi, this was a bismuth telluride module and the temperature difference it can produce depends on several things. The heat sink and the power input. This setup has a range of about -20 to 120 degrees C, but soon that heat sink will be saturated and that range will decrease on the cold end.

[lumber123456]

How much power are you pumping into that module?

[dking802]

@lumber123456 i don't remember exactly...but it was a lot to get the drop to freeze and boil so quickly.

[YamiPoyo]

Can this be applied to cpu cooling?

[dking802]

@YamiPoyo Yes, this can, but remember, you will be generating more heat on the hot side of the device. It will require a fan, just the same as a heat sink on the CPU already has. CPUs need to run warm, so you don't want to make it too cool...

[DigiDavidex2]

for the CPU

[tutun777]

hi,

we have a polymerase chain reaction (PCR) machine in our lab which uses the Peltier effect. we were having a debate about the work load on the machine at different temperatures and hope you will resolve it for us.

question - does the machine have to work more if it has to maintain temperature at 4deg as compared to 25deg celsius (ços 25 is closer to the ambient)?

[dking802]

@tutun777 Hi. I'd suspect maintaining 4deg would be more work. I don't think it'd be a problem leaving it at 25...you should be all double stranded DNA and excess primers at 25 and the polymerase should not be able to bind many places where it can extend long sequences. I think the best way to tell would be to run a gel from a PCR where you maintained 4 degrees and a PCR where you let it sit at 25deg for MUCH LONGER time than usual, so you amplify effects at 25.

[Neodymio]

Are you using an ordinary micropro heatsink?

I need less than 5ºC in the cold surface, with micropro heatsink with fan I can do it?

Thanks

[iamneoweisheng89]

i'm doing this experiment tomorrow and i didn't have a clue until i watch this video! thanks!

[plasmaguy5]

great stuff

[ELpumafogoso]

oh my god.

[Andy861993]

how many watt ? i havn´t - 17,3C° with one element

[jitendrakindra]

hi sir i m preparing a thermoelectric refrigerator cum heat pump . sir it is not cooloing the enclosure so efficiently as shown in vedio , could u plz help me out and could u plz tell me its calculation part --------- jitendra kindra from india ( +919807329175) cal me

[marinerheart]

@jitendrakindra

hi friend, could you please tell me where you got a peltier module in india. i seriously want one but couldn't find it anywhere!

thanks!

[jitendrakindra]

@marinerheart ......... sorry buddy for being so late , i was busy wid my fianl exams - i got peltier module in delhi - janakpuri west near hilton hotel.

wen u jst arive da janakpuri west metro station , there is one 5 star hotel named hilton frm there u can ask anybdy dat frm were u can get engg projects . hope this wud help u out :-)

[marinerheart]

@jitendrakindra

hi jitendra, thanks s much yaar, i live in dwarka. i would be so happy if you could tell me the exact location as i know every bit of janakpuri area near hilton.

thanks again.

[marinerheart]

@jitendrakindra

and also pls tell me how much you got it for and wattage?

thanks a lot

[dking802]

to vmelkon: The answer to your question is that it depends. It depends on how much power you supply to the device and how efficiently you are rejecting heat on the other side. Enough power and efficient dissipation of heat on the hot side could get you there. It also depends on how cold the ambient air in the freezer is, and how well that air is circulating.

[vmelkon]

@dking802 I am thinking of making a refrigerator that is inside another refrigerator that is inside another one. The peltier's would not exactly be touching each other. But if there is some limit to these devices, then there is no point of me trying. I am wondering if they can go below -80C. I still haven't found someone who has tried it although a few people have had the idea.

[vmelkon]

How cold can it get when you run one of these inside a freezer? Can it go down to -40 C?

[TehMG]

@vmelkon you can stack thermoelectric modules to achieve very large temperature differences. -40C and even lower can be achieved this way. Modules on the hotter side of the stack will need to be of higher capacity to handle the heat generated by the other modules stacked on top.

[NeilKilcullen]

it was 38.6 Degrees C ambient temperature in your room man thats a hot room....

nice video

[dking802]

Thank you and that is a good observation. Fortunately, the 38.6 reading at the beginning of the video is not measuring room temperature, but the temperature of the top of the device. We had been powering/testing the device before shooting, so the accumulated heat from the bottom side was causing the whole device to be warm while it was not being powered.

[trepasPC]

Hi, I'm interested in the plate that goes in your video. Could you tell me how to get it?

Thanks

[dking802]

These can be obtained from a variety of sources. I suggest searching Google (specifically Google Shopping) for: "thermoelectric module"

Then, you may choose what size module and what kind of power supply you will be using to power the device. Please also note that the large black heat sink seen beneath the device in the video is not sold with most modules, and you should consider how you will manage your hot-side.

[strikeagle1]

Is it possible to get it cooler using other peltier plate on top and connecting it in parallel??

[dking802]

I guess it could get cooler faster and perhaps stay cooler overall because it would be less exposed to the surrounding air, but it would not be a big difference and would require more power.

[Tyckty]

O.0

[tgamirov]

Why don't vehicle AC systems work on this principle. Seems that it'd be more efficient then compressing refrigerant.

[TimeLord6646]

that was the exact thought i just had

[dorke991]

Thats because its efficiency is around 5-10% compared with 40-60% achieved by compressing refrigerant.

[kalmanmuller1]

but this can be made more efficient through doping

[strikeagle1]

the efficency is a lot less than compressing refrigerant...

i think the efficency of the thermoelectric is around 15% or less...

[dking802]

This because currently lower efficiencies of this technology which JPL, CalTech, UCLA, and more are working to improve. However, you may have noticed the emergence of heated/cooled car seats. These features employ thermoelectric devices. In car seats, a single device that heats OR cools is advantageous. Plus, the compressor of the air conditioner is a large power draw and bringing the cooling directly to the passenger in the seat can lead to significantly less use of the air conditioner.

[dking802]

I can't tell if you're serious or not...so just in case: The noise in the video is coming from the lab ventilation system and other equipment in the room. No noise is coming from the device pictured.

[marinerheart]

are these devices available in the market or do i need to take it out of something?

i think i need one, can u tell where i can get one?

[kalmanmuller1]

@marinerheart look up customthermoelectric on google

[marinerheart]

@kalmanmuller1 thanks a lot!

[dking802]

Sorry for the delay in my response, but if you would like one, I would suggest doing a Google Shopping search for "thermoelectric module". There are plenty out there.

Good luck!

[marinerheart]

thanks a lot!

[Alexvideoclip]

As you can see....it's very noisy !

[sarcasmo57]

Nice use of the metric system.

[EugeMyster]

how many watts is the peltier device? been lookin on ebay i want to know some ratios in the watts to watercooling ^^

[gme123]

wow i never got my tec to get so cold how did u do it ?

[First2ner]

"big" heatsink on hot side, use vent to coolit even more, and almost nothing to take temperature from, like thin sheet of Al or steel. I got my 2x 136w peltiers today, will try this for sure!

[kayit83]

Hey, what is the rating of the peltier u use and how much voltage and amp had u pump in? I had played around with peltiers and they never got so effective as from what I saw from your videos...

[vwtaro]

amazing! ;-)

[Wired247]

sweet vid!! omg!

[hu0007ng]

good, but quite noisy at the back

[expl1c1t]

you're so smart. :D

[aytekyildiz]

which model is this peltier?

[dking802]

This is a bismuth telluride device with a heat sink mounted on the bottom side.

[twirlywirly55]

What size and power is the module