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What is the Peltier Thermoelectric Effect

This entry was posted in peltier effect on July 08, 2016 by II-VI Marlow Industries

NASCAR has Dale Earnhardt, cooking shows have Julia Child, and thermoelectrics has Jean Peltier. While his might not be a household name, chances are his discoveries and lasting legacy has reached you in some way. Peltier, a French physicist, is responsible for discovering what are now called thermoelectric coolers and heaters.

Thermoelectric coolers have the ability to power refrigerators, wine coolers, and control the temperature by acting as a heat pump. This energy and technology has changed the physics world and new developments are being discovered every year. Here are some of the lasting benefits of Jean Peltier’s discoveries:

The Peltier Effect

Named after the man who discovered it, the Peltier effect is surprisingly simple. An electric current that flows between two semiconductors faces is being heated on one side, and the energy output from that side simultaneously cools the other side. The Peltier effect can be reversed; you can use the energy to either heat something or cool something. From this, thermoelectric coolers and heaters were born. In addition to the Seebeck effect and the Thompson effect, the Peltier effect completes the trinity of thermoelectric rules.

The Peltier Effect Equation

Many factors go into the equation for the Peltier effect, and determining specific coefficients. The simplest form of the Peltier effect can be represented by: Here, is the Peltier coefficient of conductor A (B), and  is the electric current (from A to B). The best visual representation of the Peltier effect can be seen below:

Peltier Effect(image source: researchgate.net)

 Different coefficients that could determine any changes to the equation would be Joule heating, and thermal gradient effects, such as the Seebeck and Thompson effects. However, the fundamental basis for the equation remains the same.

Peltier Effect Cooling

Most people may own a large refrigerator, one that can hold food, drinks, and freezer items. What they don’t realize is these large refrigerators are operating on a large amount of power. They also require maintenance or upgrades when you’ve had them for too long. However, coolers that use Peltier effect modules are more reliable and do not require any maintenance. These modules are solid-state devices and do not have any moving parts, therefore they are less likely to have anything go wrong than a normal refrigerator.

Here are some more examples of the many benefits of thermoelectric coolers that use the Peltier effect:

• No refrigerants, such as chlorofluorocarbon (CFC), make these devices more environmentally friendly and safer to be around
• Modules that are small and lightweight are easily adaptable to whatever room or device they are aiding
• With less moving parts, these devices provide a faster, more dynamic response than larger cooling generators

Peltier Effect Inefficiencies

While there are many benefits to using Peltier coolers, there are also some downsides. Peltier modules actually use more power than they put out, so they are more beneficial for smaller coolers. According to the Heatsink Guide, they may consume twice as much energy (in the form of electricity) than they actually transport (in the form of heat). In addition, condensation on the device is a major issue. Because these modules can be cooled below ambient temperature (safe room temperature is between 60 and 70 degrees), condensation may occur depending on current ambient temperature, surrounding humidity, and other factors. If you are operating a device that uses the Peltier effect, be sure to monitor for condensation, as water on electronics is a safety hazard.

Peltier Coolers in Consumer Products

The average person may not think that they come in contact with thermoelectric materials often, but they are more prevalent than one would think. Some common uses of Peltier coolers in consumer products are:

• Camping gear, such as a USB powered beverage cooler
• Heat pumps used to extract water in humidifiers
• Wine coolers
• Mini refrigerators

These affordable cooling options that utilize the Peltier effect can be found in cars, home, and college dorm rooms across the country.

Industrial Uses of Peltier Coolers

Aside from more common everyday uses, thermoelectric coolers have large roles in several different industries. Photon detectors such as CCDs in astronomical telescopes, spectrometers, or very high-end digital cameras are often cooled down with Peltier elements.

Smaller modules that operate medium to low heat applications can be used for temperature stabilization in fiber optics & Ink Jet printers. Because fiber optic applications are highly sensitive to temperature, Peltier coolers are used along with a thermistor in a feedback loop to maintain a constant temperature and thereby stabilize the wavelength of the device.

Similarly, Peltier coolers cool devices used in outer space that must be kept at specific temperatures. The effect is used in satellites and spacecraft to counter the effect of direct sunlight on one side of a craft by dissipating the heat over the cold shaded side, whereupon the heat is dissipated by thermal radiation into space.

With the world of physics constantly changing and evolving, Jean Peltier was able to provide a solid foundation for thought leaders such as II-VI Marlow to build upon. The discovery of the Peltier effect has lead to several technological advances, such as single stage and multi stage coolers. II-VI Marlow’s advances with Peltier coolers have led to their uses in several different industries, such as wide range temperature calibration for thermal reference sources, imaging systems for space-based instruments, and temperature stabilization of bolometers and ferroelectric detectors. Visit II-VI Marlow to learn more about how the Peltier effect has influenced our role in the field of thermoelectrics.

Whether you’re exploring outer space, working to develop the next cure for cancer or finding sustainable energy solutions, let us partner with you to help reach your goal. For specific information, contact II-VI Marlow and we will assist with the application and cooler selection.

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