Thermal dynamics of thermoelectric phenomena from frequency resolved methods

Garcı́a-Cañadas, Jorge; Min, Gao

doi:10.1063/1.4943958

Cited by 20 publications

(23 citation statements)

References 15 publications

(26 reference statements)

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“…that the conversion efficiencies of segmented unicouple are linearly decreased with increasing the value of contact resistance. In practice, the contact resistance of metal–metal is in the range of 2 to 50 μΩcm 2 and for oxide with metal electrode, e.g., Ca 3 Co 4 O 9 and ZnO with Ag it is about 100 μΩcm 2 at about 1000 K . As a result, the major contribution to the δ magnitude is usually attributed to the oxide‐metal conjunctions.…”

Section: Resultsmentioning

confidence: 99%

Segmentation of low‐cost high efficiency oxide‐based thermoelectric materials

Hưng

Nong

Linderoth

et al. 2015

Physica Status Solidi (a)

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Thermoelectric (TE) oxide materials have attracted great interest in advanced renewable energy research owing to the fact that they consist of abundant elements, can be manufactured by low-cost processing, sustain high temperatures, be robust and provide long lifetime. However, the low conversion efficiency of TE oxides has been a major drawback limiting these materials to broaden applications. In this work, theoretical calculations are used to predict how segmentation of oxide and semimetal materials, utilizing the benefits of both types of materials, can provide high efficiency, high temperature oxide-based segmented legs. The materials for segmentation are selected by their compatibility factors and their conversion efficiency versus material cost, i.e., "efficiency ratio". Numerical modelling results showed that conversion efficiency could reach values of more than 10% for unicouples using segmented legs based p-type Ca 3 Co 4 O 9 and n-type ZnO oxides excluding electrical and thermal losses. It is found that the maximum efficiency of segmented unicouple could be linearly decreased with increasing the interfacial contact resistance. The obtained results provide useful tool for designing a low-cost and high efficiency thermoelectric modules based-oxide materials.

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Section: Resultsmentioning

confidence: 99%

Segmentation of low‐cost high efficiency oxide‐based thermoelectric materials

Hưng

Nong

Linderoth

et al. 2015

Physica Status Solidi (a)

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“…Two books, one by Gray (1960) [2] and one by Iordanishvili [4], cover extensively the subject. Recently, Nedelcu et al [21], Min [18] and García-Cañadas [17] have done experimental spectroscopic analysis of thermoelectric systems, which confirm that TE device is equivalent electrically with a capaciNon-Stationary Thermoelectric Generators http://dx.doi.org/10.5772/66421 tance in parallel with TE generator, which has internal electrical resistance. This is confirmed by theoretical papers by Apostol [9][10][11] and Goupil [5].…”

Section: Discussionmentioning

confidence: 99%

“…Spectroscopy analysis of thermoelectric devices has been performed by García-Cañadas [17] and Gao Min [18]. They have studied thermodynamics of thermoelectric phenomena by frequency-resolved methods, which show that TE devices have a capacitive component that can be exploited to improve performance.…”

Section: Spectroscopic Impedancementioning

confidence: 99%

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Non-Stationary Thermoelectric Generators

Stockholm¹

2016

Thermoelectrics for Power Generation - A Look at Trends in the Technology

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A review of theoretical publications on non-steady thermoelectrics is given. Review concerns different aspects of non-stationary and pulsed processes in thermoelectric materials and devices. Theoretical analysis of dynamic behaviour of thermoelectric devices, including analysis of small and large signals of thermoelectric generator, is given and details of concepts of quasi-equilibrium thermoelectricity are discussed as well. Special attention is paid to theoretical study of the non-routine regime of nonsteady thermoelectricity-fast-time dependence of thermoelectric properties when material or device is well out of equilibrium. Theoretical findings of fast-time dependence give reason to believe that it can increase the output electrical power of thermoelectric generator compared to stationary regime of operation. We also present experimental results obtained with first non-stationary thermoelectric generator prototype, which was designed for operation in fast-time dependence mode. Several research teams are presently making and testing devices to confirm that more electrical power can be obtained in AC mode (AC frequency about hundreds of kHz) than in DC mode. Descriptions with an analysis are given.

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“…With this technique, the frequency dependence of the voltage-current ratio across the system is analyzed and then compared to theoretical models. Besides the determination of ZT , it is also possible to gain additional information on the material's thermoelectric properties [20,21,22,23,24]. To evaluate the different characteristics of the sample, measurements are fitted to an equivalent electrical model.…”

Section: Introductionmentioning

confidence: 99%

Small-signal model for frequency analysis of thermoelectric systems

Apertet

Ouerdane

2017

Energy Conversion and Management

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We show how small-signal analysis, a standard method in electrical engineering, may be applied to thermoelectric device performance measurement by extending a dc model to the dynamical regime. We thus provide a physical ground to \textit{ad-hoc} models used to interpret impedance spectroscopy of thermoelectric elements from an electrical circuit equivalent for thermoelectric systems in the frequency domain. We particularly stress the importance of the finite thermal impedance of the thermal contacts between the thermoelectric system and the thermal reservoirs in the derivation of such models. The expression for the characteristic angular frequency of the thermoelectric system we obtain is a generalization of the expressions derived in previous studies. In particular, it allows to envisage impedance spectroscopy measurements beyond the restrictive case of adiabatic boundary conditions often difficult to achieve experimentally, and hence \emph{in-situ} characterization of thermoelectric generators

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Thermal dynamics of thermoelectric phenomena from frequency resolved methods

Cited by 20 publications

References 15 publications

Segmentation of low‐cost high efficiency oxide‐based thermoelectric materials

Segmentation of low‐cost high efficiency oxide‐based thermoelectric materials

Non-Stationary Thermoelectric Generators

Small-signal model for frequency analysis of thermoelectric systems

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