Elektor magazine published an article where they heated two 40 x 40 mm TEC1-12706 Peltier modules with a tea light and got enough power to run both a fan and an LED. A step-up booster was needed since the TEG only made about 2.2V with no load. https://www.elektormagazine.com/labs/peltier-lamp

 

Elektor magazine published an article where they heated two 40 x 40 mm TEC1-12706 Peltier modules with a tea light and got enough power to run both a fan and an LED. A step-up booster was needed since the TEG only made about 2.2V with no load. https://www.elektormagazine.com/labs/peltier-lamp

will peltier produces 5volts with temperature difference?

 

It depends on how many thermocouple elements the Peltier module has, and on how big a temperature difference can be maintained between its hot and cold junctions.

 

Elektor magazine published an article where they heated two 40 x 40 mm TEC1-12706 Peltier modules with a tea light and got enough power to run both a fan and an LED. A step-up booster was needed since the TEG only made about 2.2V with no load. https://www.elektormagazine.com/labs/peltier-lamp

Just for the record, from the project writeup:

The smaller bottom heatsink spreads the heat of the tea light in order to heat the peltier elements evenly. The larger top heatsink, which is equipped with a small fan, maximizes the temperature difference between the bottom and top side of the peltier elements.

And from earlier in this thread:

The Seebeck effect produces tiny fractions of a volt per degree K in difference between the two junctions. If you can cool the cold side sufficiently and heat the other side in an ordinary flame (e.g.a candle) you can get as much as 5W from a PC heatsink caller Peltier. That is, about 5V at 1A. But the key is the cooling, which is not easy. If you can bootstrap a 5V fan to get it cooling the cold side, in principle, it could be run from a flame heating the hot side.

The biggest problem for the TS is thinking of the Peltier device as a sort fo magic thermal battery. His initial attempt, that "didn't work" was to hold a match under the device and try to power a 12V fan. I remain unconvinced that he's really absorbed anything about the principles involved which has been repeated several times.

I am not sure how to explain it in a way that will be clearer than all the members who have replied similarly. I have the impression the TS just wants a sort of technical incantation to solve a problem he hasn't even stated. I don't think running a 12V fan from a match is his goal.

 

Just for the record, from the project writeup:



And from earlier in this thread:



The biggest problem for the TS is thinking of the Peltier device as a sort fo magic thermal battery. His initial attempt, that "didn't work" was to hold a match under the device and try to power a 12V fan. I remain unconvinced that he's really absorbed anything about the principles involved which has been repeated several times.

I am not sure how to explain it in a way that will be clearer than all the members who have replied similarly. I have the impression the TS just wants a sort of technical incantation to solve a problem he hasn't even stated. I don't think running a 12V fan from a match is his goal.

I got it.the way you all explained.and I tried seebeck effect in dc motor it runs..hot side (hot water) and cold side (cold water) I kept then the motor began to work.

 

I got it.the way you all explained.and I tried seebeck effect in dc motor it runs..hot side (hot water) and cold side (cold water) I kept then the motor began to work.

Glad to hear it. Just o be clear, to get a "useful" amount out power out of it requires a very large temperature gradient and possibly more junctions than you have. As a demonstration what you did is good, you can see it work.

 

One last comment from me on this: Using the cold water and hot water - - - you've used more energy heating the water and using it as an electrical source, dumping a lot of hot water down the drain than the amount of energy you've gotten back from the Peltier. Let me put it another way - - - You spent $10.00 to generate 10¢ worth of electricity. If that's practical to you then peace be with you.

I sincerely hope you have a great journey of discovery in your quest to learn things new. It's new thinking that leads to innovative discoveries, which fuels mankind's advancement. I wish you success in your journey.

 

One last comment from me on this: Using the cold water and hot water - - - you've used more energy heating the water and using it as an electrical source, dumping a lot of hot water down the drain than the amount of energy you've gotten back from the Peltier. Let me put it another way - - - You spent $10.00 to generate 10¢ worth of electricity. If that's practical to you then peace be with you.

I sincerely hope you have a great journey of discovery in your quest to learn things new. It's new thinking that leads to innovative discoveries, which fuels mankind's advancement. I wish you success in your journey.

Thank you so much.i too wishes you all success in yours journey

 

The trick is to go through the numbers. There are math expressions that describe the current out versus the heat flow through the junction. What you will discover is that while you can produce heat transfer by means of current flow, and it will also work i reverse, the conversion efficiency is rather low. And the effectiveness is even lower. That is what you will learn by working with the numbers. And it is why we have old style compressors and freon cooling refrigerators instead of modern, silent peltier refrigerators. Some things are simply not effective enough to be worth the effort.

 

And many years ago I had this wild idea about using the exhaust manifold heat and a bunch of thermocouples on an engine to generate power to charge the battery. The manifolds can get glowing hot and then exchanging heat with the ambient air whie driving would be a serious heat flow. UNFORTUNATELY the system would weigh more than an alternator and be larger as well.And it would cost more. But the waste heat from a standard ICE is free, and so if you have many hundreds of thermocouples and a good thermal method of insulating while attaching them it can work. Sort of.