The document presents an innovative methodology that combines the #forced response and #natural response theories of #thermoelectric #materials and #devices. It stands out for expressing the thermoelectric figure of merit in terms of the ratio of two temperatures 𝑍𝑇 = ∆𝑇’/∆𝑇, enabling comprehensive #testing and precise #characterization of thermoelectric modules and materials, including measurements of #thermal #conductivity, #electrical #resistivity, #Seebeck #coefficient, and figure of merit. Additionally, it addresses the determination of thermal resistances and thermal capacitances related to thermal contacts, as well as the derivation of characteristic time constants and angular frequencies. This approach, applicable to both modular devices and individual samples, allows for the simultaneous measurement of all parameters on a single sample. The experiments considered non-ideal contacts and non-adiabatic conditions at room temperature, 𝑇 = 300𝐾, enhancing the feasibility of in-situ characterization and positioning this methodology as a key tool in thermoelectric research.
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The new expression for the figure of merit of #thermoelectric #modules and #materials obtained in this research, 𝑍𝑇 = ∆𝑇’/∆𝑇, has the form of the #Harman #equation, 𝑍𝑇 = 𝑉a/𝑉p, but the #𝑍𝑇 equation obtained herein is expressed as a function of temperatures and the one obtained by T. C. Harman is expressed as a function of voltages.
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