Publicou 4 edições por ano
ISSN Imprimir: 2151-7975
ISSN On-line: 2151-7991
THERMODYNAMIC MODELING OF THERMOELECTRIC GENERATOR SYSTEMS
RESUMO
A second-law analysis fetched significance in analyzing thermal energy systems as it locates and quantifies the irreversibilities in the system. This paper analyzes thermoelectric generator systems through exergy analysis. Four thermodynamic models of a thermoelectric generator considering internal and external irreversibilities were developed in the MATLAB Simulink environment with temperature-dependent material properties and analyzed with various operating temperatures. Analytical formulas for exergy efficiencies and irreversibilities in the thermoelectric generator for all thermodynamic models were derived. The result shows that the exergy efficiency of the thermoelectric generator is higher than the energy efficiency. For a typical operating condition in the irreversible thermoelectric generator with 31 thermocouples and with TH and TC of 453 K and 303 K, respectively, the maximum energy and exergy efficiency obtained are 4.23% and 12.78% at same optimum current of 7.02 A. The result also shows that the effect of internal irreversibilities is more pronounced in the performance of a thermoelectric generator system when compared with the external irreversibilities. The effects of irreversible heat transfer and contact resistance in the exergy efficiency is also studied. This study will be helpful in designing actual thermoelectric generator systems.
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Manikandan S., Selvam C., Pavan Sai Praful P., Lamba Ravita, Kaushik S. C., Zhao Dongliang, Yang Ronggui, A novel technique to enhance thermal performance of a thermoelectric cooler using phase-change materials, Journal of Thermal Analysis and Calorimetry, 140, 3, 2020. Crossref