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[IEEE 2018 Conference on Electrotechnology: Processes, Models, Control and Computer Science (EPMCCS) - Kielce, Poland (2018.11.12-2018.11.14)] 2018 Conference on Electrotechnology: Processes, Models, Control and Computer Science (EPMCCS) - Investigation and Determination of Efficiency of the Waste Heat Recovery System Using Peltier Modules
摘要： High efficiency technology of waste heat energy utilization would change the face of the energy market. Due to the fact that the energy system and transport are based on fossil fuels, there is a huge potential for its efficient use. Despite the fact that the technology of Peltier semiconductor modules has been known for many years, there are no solutions that might be commonly disseminated. There is also a deficit of available sources that in a transparent, coherent and synthetic way could provide guidelines for the constructors of such devices, and show how much energy they can generate and what efficiency they have. Moreover, the Peltier modules available on the market are burdened with many stereotypes. When trying to use this technology, it should be remembered that in addition to the Peltier phenomenon, the module's operation is based on four other physical phenomena: two of them have a negative impact and they determine the practically obtained parameters of the Peltier module. These are: Joule effect and heat conduction phenomenon. The other two phenomena: Seebeck and Thomson ones, play slightly smaller roles. The aim of the authors was to investigate the self-made model of a thermoelectric generator TEG, constructed using Peltier modules. The paper presents the results of measurements and the method of determining the electrical efficiency of this model. Additionally, a temperature range was determined at that such recovery has a measurable utilitarian aspect and economic sense. The limitations of semiconductor technology of Peltier cells have been given, and design guidelines at construction process of such systems to optimize their efficiency are presented.
关键词： Seebeck effect,thermoelectric generator TEG,determination of efficiency,Peltier module
更新于2025-09-23 15:23:52
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Effect of Oxygen Partial Pressure on the Phase Stability of Copper–Iron Delafossites at Elevated Temperatures
摘要： Oxide-based materials are promising candidates for use in high temperature thermoelectric generators. While their thermoelectric performance is inferior to commonly used thermoelectrics, oxides are environmentally friendly and cost-effective. In this study, Cu-based delafossites (CuFeO2), a material class with promising thermoelectric properties at high temperatures, were investigated. This work focuses on the phase stability of CuFeO2 with respect to the temperature and the oxygen partial pressure. For this reason, classical material characterization methods, such as scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction, were combined in order to elucidate the phase composition of delafossites at 900 ?C at various oxygen partial pressures. The experimentally obtained results are supported by the theoretical calculation of the Ellingham diagram of the copper–oxygen system. In addition, hot-stage X-ray diffraction and long-term annealing tests of CuFeO2 were performed in order to obtain a holistic review of the phase stability of delafossites at high temperatures and varying oxygen partial pressure. The results support the thermoelectric measurements in previous publications and provide a process window for the use of CuFeO2 in thermoelectric generators.
关键词： high temperature thermoelectric materials,delafossite,thermoelectric generator (TEG),phase stability,Ellingham diagram
更新于2025-09-19 17:15:36
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Annual Energy Harvesting of Passively Cooled Hybrid Thermoelectric Generator-Concentrator Photovoltaic Modules
摘要： Approximately 60% of the incident energy is dissipated as heat in conventional concentrator photovoltaic modules. The hybridization with thermoelectric generators (TEGs) aims to recover part of the waste heat and transform it to electricity. Recently, the feasibility of passively cooled designs has been assessed for small sized solar cells (3 mm × 3 mm). It is expected that novel prototypes will be developed according to this concept. However, the existing feasibility studies are based on reference operating conditions, while the behavior of the hybrid modules under changing atmospheric conditions remains unknown. In this article, real atmospheric data of Jaén, Southern Spain, including irradiance, temperature, and spectral data, are used to analyze the behavior of four designs of TEG-concentrator photovoltaic modules: low ZT-low temperature (A), low ZT-high temperature (B), high ZT-low temperature (C), and high ZT-high temperature (D). This behavior is compared with that of a typical concentrator photovoltaic-only module. Results show that, while the global ef?ciency at reference conditions can be enhanced up to 4.75%, the annual averaged global ef?ciency can only be increased up to 4.30%. The results of this article will help to understand the impact of the atmospheric conditions on the real behavior of these structures.
关键词： concentrator photovoltaics (CPV),efficiency improvement,Annual energy,thermoelectric generator (TEG),hybrid system,passive cooling
更新于2025-09-16 10:30:52