Questions tagged [peltier]

The Peltier effect is a reversible physical process which is exploited in Peltier cooler/heater. The flow of current through this device pumps heat from one plate of the device to the other. This can be used to both heat and cool electronic components.

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How to drive a Peltier element?

Maybe the underlying question is what the Voltage-Current curve looks like. Can I drive it from a voltage source (like you drive a heater) or from a current source (like you drive an LED)? Or even ...
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Can Peltier devices be cascaded?

Can Peltier devices be cascaded to create a bigger temperature difference? Like mounting one on top of anther one to increase the maximum difference from 60 degrees C to 120 degrees.
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Thermistor control of peltier voltage with Arduino (for DSLR chill box project)

I am mildly familiar with electronics, mostly from playing around with electronics kits as a kid. That was a long time ago, though, maybe as much as 20 years ago. I am currently working on a cold or "...
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Are peltier elements polarized?

I'm looking to add a peltier element to one of my projects. However, I want to sometimes heat and sometimes cool, depending on the ambient temperatures on both sides of the element. Image ...
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Why peltier elements have smaller heatsink on cold side?

I have seen in nearly all configurations that Peltier elements are mounted with huge heat sinks on hot side as compared to tiny ones on small side. Is this just a way of explaining the need of heat ...
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How do electrons carry thermal energy in Peltier coolers?

I've read that when electrons enter from metal to semiconductor type N, they gain thermal energy and make that side cooler and the reverse happens when they leave semiconductor to the conductor. Why ...
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Is it worth to try making peltier based refrigerator?

I built a box from 5cm thick Styrofoam with outer dimensions 60x55x80cm. I wanted to use it as a fermentation chamber for home brew purposes. The reason why I did not choose regular (some used cheap) ...
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Thermocouple array for generating free electrical energy?

Thermocouple is a material (junction between two different metals) which generates potential difference in terms of millivolts, isn't it? Why don't we create a matrix of thermocouples (many ...
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Building a safe low-temperature heat box : heat sources

I'm not sure if this is more of a physics or electronics question, but here goes: I use a heatbox with a temperature in the range of 80-100F for warming wax (for sculpture modeling). My current ...
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Do Peltier and heater make a good combo for thermostat?

I want to achieve 0.05C stability in closed space to fit 24 bit ADC and voltage reference. Is it a good idea to use Peltier and heater together ?
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What are the efficiency limits of the Peltier effect?

I understand that thermoelectric coolers are perhaps a quarter as efficient as heat pumps. Why? What is the source of this efficiency limit? What would have to change for thermoelectric coolers to be ...
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Is it possible to obtain very small Peltier modules with fast response times?

I have a thin 2x2 mm surface that I'm trying to cool by 5-10 degrees Celsius in 1 second or less. Some very rough back-of-the-envelope calculations reveal that I need to remove ~50 mJ of energy to do ...
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Finding a 12 V Peltier module that reaches less than 0 °C on the cold side

I am making a small cooler box using a Peltier. At first, I used a Tec1-12706 without researching first, and it barely went under 12 °C at the cold side. I need a Peltier module that is 40 mm x 40 mm ...
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Corner of Peltier module is very hot

I've bought a generic TEC1-12706 Peltier module and I'm having trouble making it work. I wired it to a 12 volts DC, 8-amp power supply, and connected the hot side to a fan & heatsink with thermal ...
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2answers
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Does changing wire gauge change output of a thermocouple?

So I've been experimenting creating thermocouples with copper and constantan wire, just by twisting them together at one end and heating the junction with a candle and using a voltmeter to measure the ...
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What happens when you connect hot and cold sides of Peltier device together?

I would like to know how the Peltier device would act if you heat sink the hot side WITH the cold side. Would it just sit there and consume power? I need something to consume ~15 watts or more at 14V....
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How can I measure moisture on a conductive flat surface as an analog/digital value?

So as the title states, the question is: Is there a way to measure moisture on a electrically conductive flat surface? Optionally, it would be great if I could have an indication of the amount of ...
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Powering electronics with a low-cost thermoelectric generator?

When I replaced my water heater, the installer was telling me how cool the Bradford White unit I got was because the electronics are powered by the same heat used to heat the water in the tank. I ...
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Smoothing a High Current PWM

I am using a MOSFET to control the average voltage to a device by varying the duty cycle to the base as shown in the diagram below. My question is what is the best circuit to use in the "filter box" ...
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car A/C using peltier devices, is it feasable'

In a couple of forums where we are working on kit cars with VW air cooled engines and therefore little room for conventional air con compressors etc we are looking at electronic means of getting ...
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Trying to understand Peltier module specification

I baught this module The specifcation says: ...
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4answers
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TEC1-12706 Peltier run from diffirent voltages

My question relates to a video I saw on youtube. In this video, the user is cascading 3 TEC1-12706 peltier modules to achieve temperatures of -50 on the cold side of the cascaded peltier. The TEC1-...
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Thermal Paste on Cold Side of Peltier Freezing and not transferring “Heat”, what gives?

I am running a peltier element, and on the cold side an aluminum heat sink to effectively spread out the cool surface to the maximum possible surface area. I just bought this new thermal paste: ...
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Are peltier devices linear?

Say I've got a peltier block that is rated at 15.2V and 6A, providing 90W of cooling power to one side. Will I be able to operate it at 5V, and will it draw 2A, providing 30W of cooling power? EDIT:...
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A device like a Peltier cooler which transfers heat to another surface not in direct contact with the cold side?

Back when I was a kid and first learned about Peltier coolers, I mistakenly thought they had the ability to transfer heat remotely from one surface to another via wires. I didn't realize the heat ...
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Thermoelectric cooler powered by 12V battery too hot?

I am very much an amateur when it comes to this stuff. Basically I have a set up that goes as follows: Aluminum plate -> TEC (cold side) -> TEC (hot side) -> heat sink -> fan. The battery is 12V ...
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1answer
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Are cheap Chinese peltier modules efficient?

I'm developing a product that cools beverages and trying to decide what peltier modules to choose. I've noticed that some companies like Laird Technologies, CUI inc and TE technology offer expensive ...
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1answer
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Regulator circuit design

I need to design a regulator for my thesis, but I really need help, Please! The topic: - A temperature regulator for a small fridge Some details: - the regulator has to control a peltier element ...
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Peltier with Mosfet - Heat Issues and Alternatives

I'm interested in using a Peltier device in conjunction with arduino as a precise temperature controller. I've followed the example below and have switched out batteries with a 12v power supply. After ...
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4answers
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Two weaker peltiers vs one stronger peltier for cooling?

I'm planning on making a small water cooler for a project. I need to cool approximately 1.5L of water and have two TEC1-12706 (12v 6amp) peltier modules, and hoping to cool to as low as 6 degrees ...
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1answer
247 views

Will quickly switching polarity on a peltier damage it?

I am experimenting with different ways to heat up and cool down a peltier to a specific setpoint. Heating up the peltier to a setpoint using a PID has been relatively simple, and right now I am ...
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10answers
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Heating a tube of aluminium electrically

I need to regulate the temperature of the surface of a tube of aluminium. The tube is used as a mandrel for composite molding/curing, so the target temperature is below 100C. Currently, there is no ...
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4answers
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Peltier Unit Not Working

Recently I ordered a Peltier unit online and received it yesterday. Naturally, I was very excited to play with it. When I first turned it on, One side got hot, an another very cold. I had read that I ...
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Can I safely place a 60w between a 50w LED and a large heat sink that can dissipate 100 watts?

Today I have learned that Peltier devices can be used to generate electricity. I have a set up with a 50 watt LED which is glued to a very large heat sink that cools it without any fans (that can ...
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2answers
371 views

How can I determine the alloy in a Peltier module?

Simple question, I know I have the following Peltier module : 12711-5L31-03CL. I have it's datasheet. I'd be interested in knowing its alloy so I can know it's Seebeck coefficient and thermal ...
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1answer
771 views

How can I tell what amperage a 12V rated electrical device will run at 5V?

I am buying a TEC 12706, a thermoelectric Peltier. It's rating is: 15.4V 6A (maximum voltage and amperage). I want to run this Peltier at 5V and was wondering how I would convert this data to see ...
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1answer
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Can I dunk a peltier (TEC) module in ethanol?

I would like to remove the silicone rubber that surrounds the edge of the unit. My intention is to use the TEC as part of an optical power meter: it is painted black on one side and the terminals are ...
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Considerations for solar powered thermoelectric cooler with fan

I am building a food cooler for camping this summer. My plan is to build a thermoelectric cooler that is solar powered. My cooler is looking much like this: including a CPU fan on the hot side ...
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Wiring multiple peltier units

First of all this question relates to powering Peltier units and not the physical relationship. I have two Peltier units and a 320w 12v supply similar to this the units are TEC12715. They are ...
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H-bridge/buck converter with negative and positive voltage range

as already questioned here, i am still working on peltier controllers. For that I am using a stepper motor driver (h-bridge) with a low-pass LC filter and the peltier element behind, as Olin Lathrop ...
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2answers
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TEC 12706 not drawing more than 1.6A when powered by a 12V PC SMPS

I have recently bought TEC 12706 device from Sunrom.com; The specification says that the device can draw more than 6A current at 15.4V and internal resistance is ~2 ohms. But when I measured the ...
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1answer
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Selecting best Heat Sink for TEG (Thermoelectric generator)

I am trying to solve a puzzle about selecting the right heat sink for my TEG, but I am really confused and lost with lots of equations. Here is the Specification of my TEG (TG12-2.5-01L) Module Width ...
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1answer
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General Peltier-tivity

[EDIT: Found a couple of 12715 units in the pile that did suck the full amperage, but despite excellent cooling of the hot side, could not deliver much cooling.] I'm waist deep in project to keep ...
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2answers
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Peltier Module TEC1-12706 draws only 2.7A. Is it normal or my unit is defective?

I had recently ordered a TEC1-12706 Peltier module from amazon. I tested the module as soon as I recieved with a 1.2V Ni-Cd to make sure its working and also to make sure of the hot and cold sides. I ...
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1answer
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Peltier heat resistor temperature controller, schematic issue

I've been having a problem with the following schematic: What I need to do: Two temperature controllers in order to create a temperature gradient. The hot side is a a little above room temperature ...
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1answer
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Thermoelectric cooled Avalanche Photodiode sensor PCB

I'm designing a small PCB (max 5x5 cm) to bias and readout from an Avalanche Photodiode. Since the APD response varies greatly with the temperature, I want to use a cheap 12706 TEC together with a ...
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1answer
3k views

Peltier generators series vs parallel

If you are using peltiers as generators do you get double the voltage if you connect two in series, and double the ampage if you connect two in parallel?
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1answer
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Powering a 30 watt peltier heatpump

I've got a Peltier element rated at 12V / 2.5A (30W), but I'd like some clarification on how I should power it. I'm familiar with building power supplies with LM78xx linear regulators, and I've had a ...
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1answer
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Peltier cooling only half of one side

I got my peltier device three days ago and plugged it in as soon as I could with a heatsink. On the first few runs it got cold enough that there was condensation forming on it's cold side. But now ...
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1answer
191 views

12V PWM controller for 12V fan that gets faster with the COLD

I need a controller for a 12 V - 1A fan, blowing on the cold side of a Peltier element to keep it at constant temperature. I have the hot side under control. I have seen multiple cheap PWM ready-to-...