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Peltier Cooler For Controlling The Temperature Of Lamp Beads In The Integrating Sphere
Thermoelectric cooling uses the peltier effect to create a heat
flux between the junction of two different types of materials. A
Peltier cooler, heater, or thermoelectric heat pump is a
solid-state active heat pump which transfers heat from one side of
the device to the other, with consumption of electrical energy,
depending on the direction of the current. Such an instrument is
also called a Peltier device, Peltier heat pump, solid state
refrigerator, or thermoelectric cooler (TEC). It can be used either
for heating or for cooling, although in practice the main
application is cooling. It can also be used as a temperature
controller that either heats or cools.
This technology is far less commonly applied to refrigeration than
vapor-compression refrigeration is. The primary advantages of a
Peltier cooler compared to a vapor-compression refrigerator are its
lack of moving parts or circulating liquid, very long life,
invulnerability to leaks, small size, and flexible shape. Its main
disadvantages are high cost and poor power efficiency. Many
researchers and companies are trying to develop Peltier coolers
that are cheap and efficient.
A Peltier cooler can also be used as a thermoelectric generator. When operated as a cooler, a voltage is applied across the device, and as a result, a difference in temperature will build up between the two sides. When operated as a generator, one side of the device is heated to a temperature greater than the other side, and as a result, a difference in voltage will build up between the two sides. However, a well-designed Peltier cooler will be a mediocre thermoelectric generator and vice versa, due to different design and packaging requirements.