Performance of a thermoelectric generator intensified by temperature oscillation

Chen, Wei‐Hsin; Huang, Shih Rong; Wang, Xiao‐Dong; Wu, Po Hua; Yu, Lin

doi:10.1016/j.energy.2017.05.091

Cited by 42 publications

(5 citation statements)

References 44 publications

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“…Further, this technology has been impeded because of the inconsistent output due to temperature variations. To improve the thermal and electrical performance of TEGs, a lot of research has been done in various aspects such as load resistance [7,8], contact resistance [9], geometry configuration [10][11][12][13], sandwiched planner structure [14], improving electro-thermal couple effect [15][16][17][18], and so on. TEGs are usually made up of several thermoelectric elements (TEEs), which are connected in series and parallel in an array form to generate the required voltage and current.…”

Section: Introductionmentioning

confidence: 99%

A Variable Fractional Order Fuzzy Logic Control Based MPPT Technique for Improving Energy Conversion Efficiency of Thermoelectric Power Generator

2020

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Thermoelectric generation technology is considered to be one of the viable methods to convert waste heat energy directly into electricity. The utilization of this technology has been impeded due to low energy conversion efficiency. This paper aims to improve the energy conversion efficiency of the thermoelectric generator (TEG) model with a novel maximum power point tracking (MPPT) technique. A variable fractional order fuzzy logic controller (VFOFLC)-based MPPT technique is proposed in the present work in which the operating point of the TEG is moved quickly towards an optimal position to increase the energy harvesting. The fraction order term α, introduced in the MPPT algorithm, will expand or contract the input domain of the fuzzy logic controller (FLC to shorten the tracking time and maintain a steady-state output around the maximum power point (MPP). The performance of the proposed MPPT technique was verified with the TEG model by simulation using MATLAB /SIMULINK software. Then, the overall performance of the VFOFLC-based MPPT technique was analyzed and compared with Perturb and observe (P&O) and incremental resistance (INR)-based MPPT techniques. The obtained results confirm that the proposed MPPT technique can improve the energy conversion efficiency of the TEG by harvesting the maximum power within a shorter time and maintaining a steady-state output when compared to other techniques.

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Section: Introductionmentioning

confidence: 99%

A Variable Fractional Order Fuzzy Logic Control Based MPPT Technique for Improving Energy Conversion Efficiency of Thermoelectric Power Generator

2020

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“…It has the unique advantages of high reliability and quiet, environmentally friendly operation [9], and its application field has been widely studied [10,11]. Chen et al have shown that fluctuating temperature boundary conditions have adverse effects on TEG output performance [12,13]. Zhang et al found that fluctuating conditions of the hot side of the TE module will lead to instability and low efficiency of the TEG system [14].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Nonlinear Transient Energy Effect on Thermoelectric Energy Storage Structure

Zhu

Kong

et al. 2020

Materials

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In complex flight conditions, due to the large amount of unusable heat generated by aerodynamic heating, the thermal protection system of an aircraft needs to withstand a large temperature shock, which brings great challenges to the design of the structure. In order to effectively utilize the irregular aerodynamic heat, and improve structural heat conduction, a composite structure is formed by using phase change energy storage materials on the basis of the thermoelectric structure, which transforms the aerodynamic waste heat into stable electric energy for the internal system. Through the study of the response of nonlinear transient energy, it is found that the thermoelectric and mechanical properties of the new structure can be improved by adding phase change energy storage materials. Under actual flight conditions, the new structure can reduce the maximum temperature by 180 K and the maximum thermal stress by 110 Mpa. The mechanical properties of the structure are effectively improved, the service life of the structure is prolonged, and the waste heat can be converted into stable electrical energy output to improve the thermoelectric output performance. On the premise of ensuring conversion efficiency, the output power of the new structure has been improved by 64.8% through structural optimization under actual flight conditions.

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“…Non-equilibrium thermodynamic theory [ 6 , 7 , 8 ] is the basic theory to analyze the performance of TE devices. Some researchers have studied TEGs [ 9 , 10 , 11 , 12 ], TEHs [ 13 , 14 , 15 ], TECs [ 16 , 17 , 18 , 19 ], and combined TE devices [ 20 , 21 , 22 , 23 ] based on non-equilibrium thermodynamics, and some meaningful results have been gained. Vella et al [ 20 ] proposed a TEG-driven TEC (TEG-TEC) combined device that uses solar energy as the heat source.…”

Section: Introductionmentioning

confidence: 99%

“…The Thomson effect [ 24 , 25 ], which describes the heating or cooling when electrical current flows through a conductor with a temperature gradient, is one of the TE effects. The Thomson effect has been neglected in most thermodynamic studies on TE devices [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. However, some researchers have found that the Thomson effect has a notable influence on the performance of TE devices.…”

Section: Introductionmentioning

confidence: 99%

“…The Seebeck coefficient, electrical resistance, thermal conductivity, and the Thomson coefficient of TE materials are temperature dependent. TE devices have been studied in the case of constant TE properties in many relevant literature in order to simplify the calculation process [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. Some researchers have performed thermodynamic studies on traditional TE devices in the case of temperature-dependent TE properties [ 28 , 29 , 30 , 44 , 45 , 46 , 47 , 48 ], and some practical results have been gained.…”

Section: Introductionmentioning

confidence: 99%

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Influences of the Thomson Effect on the Performance of a Thermoelectric Generator-Driven Thermoelectric Heat Pump Combined Device

Feng

Chen

Meng

et al. 2018

Entropy

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A thermodynamic model of a thermoelectric generator-driven thermoelectric heat pump (TEG-TEH) combined device is established considering the Thomson effect and the temperature dependence of the thermoelectric properties based on non-equilibrium thermodynamics. Energy analysis and exergy analysis are performed. New expressions for heating load, maximum working temperature difference, coefficient of performance (COP), and exergy efficiency are obtained. The performance is analyzed and optimized using numerical calculations. The general performance, optimal performance, optimum variables, optimal performance ranges, and optimum variable ranges are obtained. The results show that the Thomson effect decreases the general performance and optimal performance, and narrows the optimal operating ranges and optimum variable ranges. Considering the Thomson effect, more thermoelectric elements should be allocated to the thermoelectric generator when designing the devices. The optimum design variables for the maximum exergy efficiency are different from those for the maximum COP. The results can provide more scientific guidelines for designing TEG-TEH devices.

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Performance of a thermoelectric generator intensified by temperature oscillation

Cited by 42 publications

References 44 publications

A Variable Fractional Order Fuzzy Logic Control Based MPPT Technique for Improving Energy Conversion Efficiency of Thermoelectric Power Generator

A Variable Fractional Order Fuzzy Logic Control Based MPPT Technique for Improving Energy Conversion Efficiency of Thermoelectric Power Generator

Analysis of Nonlinear Transient Energy Effect on Thermoelectric Energy Storage Structure

Influences of the Thomson Effect on the Performance of a Thermoelectric Generator-Driven Thermoelectric Heat Pump Combined Device

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