Thermoelectric Cooling

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thermoelectric cooling

[¦thər·mō·i′lek·trik ′kül·iŋ]
(engineering)
Cooling of a chamber based on the Peltier effect; an electric current is sent through a thermocouple whose cold junction is thermally coupled to the cooled chamber, while the hot junction dissipates heat to the surroundings. Also known as thermoelectric refrigeration.

Thermoelectric Cooling

 

the absorption of heat when an electric current is passed through a thermal converter.

The essence of thermoelectric cooling lies in the appearance of a temperature difference at the junctions of the thermal converter; at the cold junction, heat is absorbed from the substance to be cooled, and the heat is transferred to the hot junction and later to the environment (seePELTIER EFFECT). Concurrently with the generation of cold, heat is liberated in the circuit of the thermal converter and transferred to the cold junction by conduction. The resultant characteristic of the cooling capacity of the thermal converter used for thermoelectric cooling is the efficiency Z = α2/ρλ, where a is the thermoelectric power, λ is the specific heat conductivity, and p is the specific electric resistance. Semiconductors (Z = 1.5–3.5 deg–1)—for example, triple alloys of antimony, tellurium, bismuth, and selenium—are ordinarily used for producing the thermal converters for thermoelectric cooling. Thermoelectric coolers are simple in design, have no moving parts or coolants, and are safe in use but are wasteful of energy (the specific consumption of electricity is 6–8 times greater than in compressor refrigerators). Thermoelectric cooling is ordinarily used in installations with a refrigerating capacity of up to 100 watts, which find practical application in electronics, vacuum technology, instrument-making, and medicine.

V. A. GOGOLIN

References in periodicals archive ?
The core element of PCD is the "Peltier device" which employs the basic Peltier effect to yield heating at one side and cooling on the other side" [2].
The setup of gas detection consists of the test chamber with the Love wave device, the thermal control system with a Peltier device, the dual channel frequency counter, the flow meters, synthetic air and toluene bottles, and a PC for control and data acquisition in real time.
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And more than one stage Peltier device is not comfortable for integration into human wearing clothes for cooling system.
It manufactures an assembly that includes a thermoelectric-cooling Peltier device. Many of these fragile and expensive devices were damaged during assembly.
A built-in Peltier device lowers temperature from room temperature to -5 C in 15 minutes and holds the temperature to within 0.1[degrees].
As its name implies, beyond just drawing the air away from the seated occupant, this system has two channels, one of which includes blowing cool air generated through the use of a thermal change insert (i.e., a Peltier device, a small ceramic-based solid-state unit that works as a heat pump) so that when the occupant gets into a hot car there is the sensation of cooling.
Temperature control is by means of a Peltier device which is said to offer simplicity and compactness, as well as relatively rapid changes in set point temperature.
The Peltier device uses the cyclone principle of centrifugal force to push the sampled gas against the cooled wall of the heat exchanger in the module.
A quick quality check can be accomplished with an AC ohms measurement on the Peltier device and its thermistor feedback element.
The fundamental component of this camera is a TC245 CCD chip, manufactured by Texas Instruments, which includes dark noise reduction through the use of a peltier device, which cools the CCD chip.