Performance enhancement of a thermoelectric system with improved natural convection cooling by utilizing the chimney effect

Schwurack, R.; Bärschneider, Johannes; Unz, Simon; Beckmann, Michael

doi:10.1016/j.enconman.2021.114118

Cited by 14 publications

(6 citation statements)

References 24 publications

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“…For preliminary numerical analysis, only the first 10 min of stove operation were chosen since the flue gas temperature was lower than 320 °C. As shown in [ 43 ], this is a safe temperature limit for the application of TEGs. The measured flue gas temperature was implemented in the solver as a time-dependent user-defined function (UDF) based on polynomial regression.…”

Section: Methodsmentioning

confidence: 99%

“…This paper was focused on geometry optimization, which aimed to maximize the temperature difference between the hot and cold sides of the TEGs and maintain the temperature below the required technical limit of 593 K. The authors have chosen the parameters that have the greatest impact on the power output: length of the upper finned zone and exhaust duct, fin thickness, burner thermal output, and deflector width. However, the research included in [ 43 ] presents a concept of the heat exchanger that could enhance the cooling effectiveness of the TEGs without the consumption of any electricity. The idea is to apply to utilize the chimney effect to improve heat transfer from the fins.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical and Experimental Analysis of a Prototypical Thermoelectric Generator Dedicated to Wood-Fired Heating Stove

Sornek

Papis-Frączek

2023

Micromachines

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The typical operating range of domestic heating devices includes only heat generation. However, the availability of combined heat and power generation in microscale devices is currently becoming a more and more interesting option. This paper shows the experimental and numerical analysis of the possibility of developing a micro-cogeneration system equipped with a wood-fired heating stove and a prototype of the thermoelectric generator equipped with low-price thermoelectric modules. In the first step, mathematical modeling made it possible to analyze different configurations of the hot side of the thermoelectric generator (computational fluid dynamics was used). Next, experiments have been conducted on the prototypical test rig. The maximum power obtained during the discussed combustion process was 15.9 We when the flue gas temperature was approximately 623 K. Assuming a case, when such value of generated power occurred during the whole main phase, the energy generated would be at a level of approximately 33.1 Whe, while the heat transferred to the water would be approximately 1 078.0 Whth. In addition to the technical aspects, the economic premises of the proposed solution were analyzed. As was shown, an installation of TEG to the existing stove is economically not viable: the Simply Payback Time will be approximately 28.9–66.1 years depending on the analyzed scenario. On the other hand, the SPBT would be significantly shorter, when the installation of the stove with an integrated thermoelectric generator was considered (approximately 5.4 years). However, it should be noted that the introduction of the power generating system to a heat source can provide fully or partially network-independent operation of the hot water and heating systems.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analysis of a Prototypical Thermoelectric Generator Dedicated to Wood-Fired Heating Stove

Sornek

Papis-Frączek

2023

Micromachines

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“…Hal ini dikarenakan suhu pada permukaan panel menurun seiring dengan laju aliran udara yang diberikan. Dari hasil penelitian sejalan dengan penelitian yang pernah dilakukan oleh peneliti sebelumnya, [13], [14], [15].…”

Section: Hasil Dan Pembahasanunclassified

Pengaruh pendinginan fluida udara terhadap kinerja fotovoltaik dengan variasi laju aliran udara

Pido¹,

Boli²,

Rifal³

et al. 2023

sintek. jurnal. ilm. teknik. mesin

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Penelitian ini bertujuan untuk mengevaluasi pengaruh penggunaan media udara sebagai pendingin pada modul fotovoltaik terhadap daya keluaran dan efisiensi listrik. Energi fosil, sebagai sumber energi utama saat ini, memiliki keterbatasan persediaan dan menghadirkan tantangan dalam pemenuhan kebutuhan energi di masa depan. Dalam upaya untuk mengatasi masalah ini, kami melakukan pengujian dengan menambahkan sistem pendinginan udara menggunakan blower di bagian bawah modul fotovoltaik. Pengujian dilakukan dengan variasi laju aliran udara, dan hasilnya menunjukkan bahwa penggunaan media pendinginan udara dapat meningkatkan daya keluaran dan efisiensi modul fotovoltaik. Rata-rata daya keluaran meningkat sebesar 31,66 Watt dengan efisiensi sebesar 3,52%. Namun, ketika laju aliran udara meningkat sebesar 1,5 m/s, terjadi penurunan daya ratarata sebesar 28,9 Watt dan efisiensi sebesar 3,22%. Hasil ini menunjukkan bahwa kecepatan udara mempengaruhi temperatur, daya keluaran, dan efisiensi modul fotovoltaik.

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“…Placing the TEGs between the PCM and the air ducts ensures relatively stable hot-side temperatures and effective cold-side heat rejection. Previous work has shown that a chimney effect can increase energy recovery from TEGs by increasing the airflow velocity over cooling surfaces [11]. However, increased air temperature within the chimney space could offset these benefits, which need to be assessed.…”

Section: Introductionmentioning

confidence: 99%

Harvesting Electric Energy Using Thermoelectric Generators in a Residential Heating Application

Chukwurah,

McTaggart-Cowan

2024

Energies

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Biomass combustors provide space heating by converting chemical energy in woody biomass into low-temperature thermal energy. Thermoelectric generators (TEGs) can generate electricity from the heat flux without significantly reducing heating performance. However, most current TEGs are small (40 mm × 40 mm), requiring many TEG elements to generate useful power from a biomass combustion-based space heater. This work compares the electrical generation potential of an array of small TEGs with a larger (80 mm × 120 mm) TEG in a vertical configuration representative of a residential heating appliance. An experimental facility was developed for various representative cold-side ducts and controllable hot-side temperature and cooling airflows, and the Taguchi method was used to evaluate the impacts of temperature, airspeed, and ducting configurations. The results indicate that temperature and airspeed significantly influence TEG power, while ducting configurations have an insignificant influence. The large TEG achieved more consistent temperatures but produced lower power than an array of smaller TEGs with the same total area. The study emphasizes optimizing TEG design and operating conditions to enhance electricity generation efficiency in space heating combustors.

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Performance enhancement of a thermoelectric system with improved natural convection cooling by utilizing the chimney effect

Cited by 14 publications

References 24 publications

Numerical and Experimental Analysis of a Prototypical Thermoelectric Generator Dedicated to Wood-Fired Heating Stove

Numerical and Experimental Analysis of a Prototypical Thermoelectric Generator Dedicated to Wood-Fired Heating Stove

Pengaruh pendinginan fluida udara terhadap kinerja fotovoltaik dengan variasi laju aliran udara

Harvesting Electric Energy Using Thermoelectric Generators in a Residential Heating Application

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