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Electronic devices thermoelectric generator

Resetirch on thermoelectric materials has experienced a considerable resurgence in the past five years driven by three underlying concerns 1) the environmental impact of freon-based cooling technologies, 2) the generation of electrical power from so-called waste heat in automobiles, and 3) the active cooling of modern electronic device components. [Pg.282]

Fig. 22. A single thermoelectric couple is illustrated that has been configured for refrigeration or power generation. The labels p (positive) and n (negative) refer to the sign of the charge carriers in each leg (open circles correspond to holes and filled circles to electrons). Refrigeration is possible in these devices because electrons (or holes) carry heat, and hot electrons (holes) can be forced away from the cold end of the device by the battery. If a temperature difference is externally imposed on the device, useful power can be extracted. Fig. 22. A single thermoelectric couple is illustrated that has been configured for refrigeration or power generation. The labels p (positive) and n (negative) refer to the sign of the charge carriers in each leg (open circles correspond to holes and filled circles to electrons). Refrigeration is possible in these devices because electrons (or holes) carry heat, and hot electrons (holes) can be forced away from the cold end of the device by the battery. If a temperature difference is externally imposed on the device, useful power can be extracted.
A battery of complementary techniques is often necessary (and always desirable) to provide reliable, applications-oriented characterization of the bulk properties of (catalytic) carbon materials. Arguably the most useful ones are transmission electron microscopy (TEM), thermoelectric power (TEP) measurements, electron spin resonance (ESR) spectroscopy coupled with a superconducting quantum interference device (SQUID), and Raman spectroscopy. For example, among the recently reported virtues of Raman spectroscopy is the identification of graphite whiskers [152,153] in three carbonaceous chondrite meteorites (M. Fries and A. Steele, Science Online, Feb. 28, 2008), which contain some of the oldest matter in the solar system and has thus generated tremendous interest among astrophysicists. [Pg.18]

The generator which was designed specifically to provide sufficient electrical energy to power an electronic gas flow monitoring system, in excess of 1.5 volts, could be supplied when a temperature difference of a few tens of degrees was established across the device. Any available heat source such as the surface of a hot water pipe would provide sufficient heat flux to provide the required voltage, utilising waste human body heat to power a thermoelectric watch battery. ... [Pg.119]

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See also in sourсe #XX -- [ Pg.356 ]



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