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B7: Device and system performance
Novel technology to increase the thermoelectric efficiency at minimum 25% for delta T > 200C and integration it into TE generators pulse operated will be presented. Thermoelectric materials are based on bulk Bi-Sb-Te-Se alloys and a new design of TE generators able to be pulse operated will be used.
Technical barriers of decreased conversion efficiency met in traditional TE generators will be lifted by using “ultra-fast” electrical pulses [1] and customized operating regime [2] of such thermoelectric devices. As heat source can be used any heating technology using gas , liquid or solid fuel, isotopic heating source or sun concentrators etc. Regarding the assembling of TE devices, novel method will be applied for minimizing thermal dissipation [3]. In this paper will be presented so, the thermoelectric efficiency obtained on a 5 kW thermoelectric generator [4] and will be described the principal direction to design a thermoelectric generator able to deliver a hundred kW electrical power.
[1] M. Apostol, M. Nedelcu, “Ultrafast thermoelectric conduction”, IEEE Proc. 20th Int. Conf. Thermoelectricity, Beijing, China 2001, p.42
[2] M Apostol, M Nedelcu, “Pulsed thermoelectricity”, J. Appl. Phys. 108 023702, (2010)
[3] Pulsed Thermoelectric Machine. M. Nedelcu M. Apostol, J. G. Stockholm, Proceedings of IX Conference Polish Ceramic Society – Zakopane Sept.
[4] Schroeder US patent: N° US 8,101,846