1274 A Large Peltier Device

What if you stack them? I in series

You want to stack those and run them in parallel

If you've got 6 sandwhiched on top of each other, hot at the bottom and cold at the top, all of them connected in parallel and series itll balance out the heat difference energy output between them all

I wonder if you can put it on hot sand? Heated up by good ole coal?

Put your clever turbine beneath it, to cool the fins and place it in the sun under a lens. The power can be run to a capacitor bank, and attached to batteries. If ducted cleverly it can be used to duct the cool air to do something useful😂

How useless and wasteful, cant even generate 1w

Could u burn wood in a burner and then power the unit with this method so that u don't need electric input to be able to see the temperature

Can you connect this to the sand battery

can you run a peltier device in a full vacume, im curious to how it would perform.

could you put this under your rocket stove ?

I've read that if a TEC is good for cooling, it is not good as a generator, must buy a TEG module for efficient power generation (apparently).

I have been looking into using Peltier Module to make a small air cooler for my work truck (we currently do not have air conditioning in our trucks.)
Would this be a good starting point or is the heat to cooling ratio going to void the cooling positives.

Cold side with letters. Got it.

Using biogas as your heat source( hot side) to produce electricity might be more efficient than using biogas to run a gas generator which is approximately only 15-20% efficient.

Could you do a video on how to make your own large peltier module, so we don't have to buy a bunch of small ones?

Did you have to remove some videos? Seems like I watched one about some school trying to patent something that was already patent and you called them out over it

how about a concentrating solar thermovoltaic panel?

Mate , I can see where this is going, but peltiers are very week no good mate ! TEG s are designed to work in reverse , some are 20W each! I suggest they are powered by LRNR which only consumes 2.5w of energy, then you will see OU.

Interesting, once I looked up if there was any improvement made to peltier devices, I was thinking..perhaps there is a way to create them in a configuration similar to halbach array with magnets, of course, I know it works differently with magnetism, but I thought it could be awesome if you could have just 1 side with either hot or cold and much higher efficiency and making it so the opposite side is "cancelled" that would be awesome but don't even know if it's possible, maybe with some advanced physics in a few years they could pull that off or maybe I should study physics aha, too bad I'm horrible at maths 😂 .. also I looked up if there was any improvement on efficiency, if I remember correctly I think one company claims to have higher efficiency peltier, it would be interesting to see the specs.

You need just as massive a thermal spreader in the hot side as you have on the cold side so as to keep them all thermally in parallel, and not fighting each-other electrically.
I'd use thermal epoxy and then remove the clamping screws too.

I was given a stove top fan like that and I actually thought about putting loads of them together to make power. Glad you did it to show me it works. Cheers👍😉

you mean graphoil Plus conductive ink binder oc 💯

Does anyone realise he's a smartarse an ima dumbarse?

About thermal contact: I've had success with lapping Peltier modules. Off the factory, they are somewhat crooked, so instead of using an excessive amount of thermal paste, I ran them across some fine wet sanding paper to plane them. This improved Delta T by a few degrees. (When you can see the shadow of the individual junctions through the ceramic plate, they've had enough!). Also keeping multiple Peltier devices between the same two plane surfaces might not be consistent as they also are of varying thickness. Ideally you want them individually in compression at their force limit according to their data sheet, preferably spring loaded or with the screws in plastic bushings, to take up thermal expansion. I run a single 40W Peltier device as a generator on my bedroom heating pipe. The pipe is at 53 C and ambient is 19-21 C during winter, so it only produces 0.6V! This I run through a boost converter to make 5V at 50mA, which is sufficient to keep my sat alarm clock always charged during winter, In summer the radio is charged by a 20W solar panel in my bedroom window (mostly indirect sunlight, so a 20W panel is what it took). Nice to know we wont oversleep during the apocalypse.

Maybe a new invention would be to run a watch with a peltier module. The watch will never need battery.. the watch can be charge by the heat of the human body and a capacitor.

So, ~1500W heater to generate a temperature differential that produces 200mW from the Peltier device? All kidding aside, I tried an experiment like this once with a large, 54V input Peltier heat pump. It had large finned heat sinks with circulation fans factory assembled on both sides. Efficiency was massively disappointing. They're designed to take electricity and generate a temperature differential. Notoriously inefficient the other way around.

Glad to see you're still making videos, though. I need to get my rear back in gear.

Cheers!

Created something similar a few month back, you heat sink will need higher fins if you want to passive cool, you will be able to maintain 40c with a fan on the heat sink. You will need a 80-100 degree difference to get close to the rated power. Watch out you solder contacts on the module will melt at 100c

* * * * * * * YOU SHOULD ADD A DIODE ON EACH POSITIVE WIRE OF EACH PELTIER BECAUSE IF ONE IS CREATING MORE POWER THAN ANOTHER THE POWER WILL FEED BACK TO THE LESS POWER ONE AND MASSIVELY REDUCE THE OUTPUT. A DIODE ON EACH WILL PREVENT THIS. * * * * * * * *

Looks like not spreading heat evenly, so may not be getting full use.

Seebeck in full effect.

It could placed under a solar panel to cool the panel and draw the heat for extra solar energy?

Rob you mentioned in another video zeolite and calcium chloride would heat up , i’ve ordered some sample quantities to soon find out but would the heating effect be enough for this type of application? Also the choice of parallel wiring - is that to lower resistance/ raise output current ? (I need to lookup if Ohms law applies in the case of Peltier’s, i guess not?). Perhaps some points to expand on in future videos :)

not sure if most are aware too but the rating on those is differential, so if it is rated at 60C that means it will generate 30C higher temp on hot side and 30 C lower on the cool side before it starts to loose efficiency and the heat starts to bleed back through along with the unit causing more heat than it is removing, thus why I mentioned before about stacking them as I saw it is a solution for getting higher disparity of heat difference (like 60C cooler and 60C hotter respectively LOL)

I know the compressive strength needed to properly use that graphite based sheet is pretty high, but I am wondering if the fact that graphite is porous (there is a channel that I saw using machined graphite blocks to place bearings in, and drilled a hole for putting an air compressor to it so you can pump air into the graphite block, making it an air bearing by pushing air through the graphite block and levitating the bearing on a cushion of air a fraction of a mm thick so when spun it would spin just for ever.) anyway that porosity seems like it would be conducive for making sure no air gets trapped inside the gaps between the interfaces you are trying to fill up with the conductive material :) also I wonder if the pressure can be applied more gently by placing weight on the objects and then putting it all in a vacuum chamber to pull that air out of the gaps and pores of the graphite while letting the weight on it settled down, instead of just applying more downward force to squeeze it out in normal atmospheric pressure. I am guessing also half the needed pressure applied while it sits on some sort of vibrating device like an ultrasonic transducer seems like it would move things around more gently allowing the settling to get maximum performance out of the thermal contact.

I wonder if the graphfoil is what grizzly is using in their thermal pads that are reusable, since they do have a carbonaut (they also have a liquid metal conductonaut that you have to protect things from conductive metal contact shorting but has the highest thermal conductivity of everything on there. so.. there is that :)

you should try doubling them making sure to place them the same direction in the stacks. :) (and good thermal paste between each so the hot side of the first one can be cooled by the cold side of the 2nd one and the heat of the 2nd gets cooled by the heat sink, and some fans. I have seen some stacked 4 deep. Really thinking we could generate that needed super cold temps for cloud chamber's to detect radiation particles :)

You could do 10x10 on a plate (painted black)stick it in the sun and cool the back with cold water, im thinking one of those little dc water pumps off ebay. Old fridges would be a good source of parts for the cold side.

Cant see motor.

This is what I am here fore. These devices are seemingly inefficient. But they are low cost, solid state and so simple. If setup in the right way and the right scenario they are game changers and it is awesome.

Nice one Rob. I like this topic

I assume that the peltier devices are copper constantan thermocouple clusters?

Love your videos, but can you make a big faraday cage. Thanks. Could I use an old chest freezer as a faraday cage. Cheer's. Can you make one using a chest freezer. Thanks again for your videos.

Now in reverse, please! What does hooking up the smallest PV cell to the peltier do for the temp difference? Add a cooling grid atop to radiate away & up. Then thermal glue a large surface area that thins to a point below & see how much water it can generate in a day

We've been waiting 20 years for improvements in Peltier efficiency. I remember running a radio off a thermocouple power by a candle 50 years ago. I would think if we put the Peltiers in series (hot to cold) we might get some possible useful refrigeration. A 40° degree difference is not enough. But then again that puts us up to about 100 watts. Maybe we should go back to the rare metals of thermocouples. Graph-foil, is it; the replacement for paste?

Try painting it with that new black that absorbs 99% of light. I bet the sun would cook them right up. Maybe a double pc fan to cool it running from the power it makes?

Robert, which has more power output - bi-metallic thermo-generation or Peltier junctions? Also, I think you would need 14 Peltier junctions, connected in series to generate enough voltage to charge a 12V battery or do they generate more than a volt each?

I’ve got a single peltier and a perfectly sized heat sink I’d forgotten about…..it’ll make a great little single bear chiller 😊

Too bad these aren't cheap enough to mount onto my solar panels.

you can always stack a few peltiers ontop of one another to gain a better temperature differential. I've gotten this to work with up to 4 stacked peltiers in the past. after 4 it seems to stop making a difference.

Seebeck - Peltier / Tomato -Tomahto / TEC -TEG