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With the accelerating improvements and interests in high temperature thermoelectric materials and their applications for power generation, there is the emerging need to fully characterize thermoelectric modules. One of critical challenges in testing modules, especially at high temperatures, is being able to accurately control and measure heat rates transferred across a module. Many of the current characterization techniques are limited to solely measuring the electrical response and ignore the heat transfer. The new technique, described within, is able to accurately measure the three key characteristic properties, namely Seebeck coefficient, electrical resistance, and thermal conductance of a thermoelectric module over temperature ranges from 50 to 650°C. To ensure isothermal surfaces and minimize heat rate errors, a primary heater is encased in a guard heater. Rapid pulsed electronic loading allows for rapid voltage-current scans while avoiding thermal drift. The thermal conductivity of a reference material is used to validate the performance of the guard heater assembly and heat monitoring setup.Copyright © 2013 by ASME |
