High-Performance Silicon–Germanium-Based Thermoelectric Modules for Gas Exhaust Energy Scavenging
| Autor: | J. Dufourcq, Guillaume Bernard-Granger, S. Vesin, L. Aixala, T. Baffie, K. Romanjek |
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| Rok vydání: | 2015 |
| Předmět: |
Test bench
Materials science business.industry Energy conversion efficiency Condensed Matter Physics Thermoelectric materials Electronic Optical and Magnetic Materials Silicon-germanium chemistry.chemical_compound Thermoelectric generator chemistry Heat exchanger Thermoelectric effect Materials Chemistry Optoelectronics Bismuth telluride Electrical and Electronic Engineering business |
| Zdroj: | Journal of Electronic Materials. 44:2192-2202 |
| ISSN: | 1543-186X 0361-5235 |
| DOI: | 10.1007/s11664-015-3761-1 |
| Popis: | Some of the energy used in transportation and industry is lost as heat, often at high-temperatures, during conversion processes. Thermoelectricity enables direct conversion of heat into electricity, and is an alternative to the waste-heat-recovery technology currently used, for example turbines and other types of thermodynamic cycling. The performance of thermoelectric (TE) materials and modules has improved continuously in recent decades. In the high-temperature range (Thot side > 500°C), silicon–germanium (SiGe) alloys are among the best TE materials reported in the literature. These materials are based on non-toxic elements. The Thermoelectrics Laboratory at CEA (Commissariat a l’Energie Atomique et aux Energies Alternatives) has synthesized n and p-type SiGe pellets, manufactured TE modules, and integrated these into thermoelectric generators (TEG) which were tested on a dedicated bench with hot air as the source of heat. SiGe TE samples of diameter 60 mm were created by spark-plasma sintering. For n-type SiGe doped with phosphorus the peak thermoelectric figure of merit reached ZT = 1.0 at 700°C whereas for p-type SiGe doped with boron the peak was ZT = 0.75 at 700°C. Thus, state-of-the-art conversion efficiency was obtained while also achieving higher production throughput capacity than for competing processes. A standard deviation 3.6 W. An air–water heat exchanger was developed and 30 TE modules were clamped and connected electrically. The TEG was tested under vacuum on a hot-air test bench. The measured output power was 45 W for an air flow of 16 g/s at 750°C. The hot surface of the TE module reached 550°C under these conditions. Silicon–germanium TE modules can survive such temperatures, in contrast with commercial modules based on bismuth telluride, which are limited to 400°C. |
| Databáze: | OpenAIRE |
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