Numerical evaluation of energy system based on Fresnel concentrating solar collector, Stirling engine, and thermoelectric generator with electrical energy storage

Feng, Yu‐Qi; Cai, Wei; Wang, Shengxu; Zhang, Caixia; Liu, Yaxin

doi:10.1002/er.7099

Cited by 13 publications

(3 citation statements)

References 45 publications

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“…Here, it is assumed that TEG is isolated from the outside environment. In addition, considering the temperature of the TEG's hot electrode equal to the temperature of the heat released from TIG, and the temperature of the TEG's cold electrode equal to the temperature of the outside environment, the TEG's output power and efficiency are expressed as follows (according to Newton's law) 61 :

({, \begin{array}{l} P_{TEG} goodbreak= q_{H} goodbreak- q_{L} \\ η_{TEG} goodbreak= \frac{P_{TEG}}{q_{H}} \end{array})

where, q H and q L , respectively, stand for the heat absorbed by the hot end and heat released from the cold end 62 :

({, \begin{array}{l} q_{H} goodbreak= α . T_{A} I_{TEG} goodbreak+ K_{TEG} . ((), T_{A} goodbreak- T_{amb}) goodbreak- \frac{I_{TEG}^{2} . R_{TEG}}{2} \\ q_{L} goodbreak= α . T_{amb} I_{TEG} goodbreak+ K_{TEG} . ((), T_{A} goodbreak- T_{amb}) goodbreak+ \frac{I_{TEG}^{2} . R_{TEG}}{2} \end{array})

where, α , I TEG , K TEG , and R TEG , respectively, refer to the Seebeck coefficient, TEG's electric current, total thermal conductivity, and TEG's resistance. The following equation is defined to calculate I TEG 26 :

I_{TEG} goodbreak= \frac{α . ((), T_{A} goodbreak- T_{amb})}{R_{TEG} + R_{TEG}^{'}}

where, R ′ TEG stands for the resistance of external load.…”

Section: Methodsmentioning

confidence: 99%

“…25 Here, it is assumed that TEG is isolated from the outside environment. In addition, considering the temperature of the TEG's hot electrode equal to the temperature of the heat released from TIG, and the temperature of the TEG's cold electrode equal to the temperature of the outside environment, the TEG's output power and efficiency are expressed as follows (according to Newton's law) 61 :…”

Section: Teg Modelmentioning

confidence: 99%

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Assessment and conceptual design of a SOFC / TIG / TEG ‐based hybrid propulsion system for a small UAV

Ren

2022

Intl J of Energy Research

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Summary Improving the electricity output of a propulsion configuration of an unmanned aerial vehicle (UAV) can be effective in achieving the targets of controlling fuel consumption and high flight endurance. Recently, fuel cell‐powered UAVs have been developed to achieve these goals. In addition, the use of an integrated fuel cell‐based electric propulsion system can further improve power generation rate. On the other hand, due to the limited reports on fuel cell‐powered UAVs (especially solid oxide fuel cell [SOFC]), it is necessary to conduct more and detailed studies. In this regard, the present article provides a conceptual analysis of a SOFC/thermionic generator (TIG)/thermoelectric generator (TEG) integrated propulsion configuration to produce electric energy of a small UAV. SOFC stack converts chemical energy into electric current and thermal energy. The thermal energy of the stack's exhaust is converted into electric power under two processes in downstream generators. The objective of this work is to calculate the needful power of an UAV at desired mission requirements. The present study presents a new propulsion configuration. In addition, the proposed system's design and modeling as well as provided results are in such a way that the propulsion system can be generalized for any desired size of UAV. The finding revealed that the introduced propulsion configuration could produce nearly 553.7 W of electricity. Moreover, the efficiency of electricity production was close to 49.3%. It was also found that the drone requires nearly 1.3 kW of electric power to perform the intended mission. According to the conceptual evaluation of the proposed propulsion configuration, five scenarios are also suggested to provide the necessary power to the UAV.

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({, \begin{array}{l} P_{TEG} goodbreak= q_{H} goodbreak- q_{L} \\ η_{TEG} goodbreak= \frac{P_{TEG}}{q_{H}} \end{array})

where, q H and q L , respectively, stand for the heat absorbed by the hot end and heat released from the cold end 62 :

({, \begin{array}{l} q_{H} goodbreak= α . T_{A} I_{TEG} goodbreak+ K_{TEG} . ((), T_{A} goodbreak- T_{amb}) goodbreak- \frac{I_{TEG}^{2} . R_{TEG}}{2} \\ q_{L} goodbreak= α . T_{amb} I_{TEG} goodbreak+ K_{TEG} . ((), T_{A} goodbreak- T_{amb}) goodbreak+ \frac{I_{TEG}^{2} . R_{TEG}}{2} \end{array})

I_{TEG} goodbreak= \frac{α . ((), T_{A} goodbreak- T_{amb})}{R_{TEG} + R_{TEG}^{'}}

where, R ′ TEG stands for the resistance of external load.…”

Section: Methodsmentioning

confidence: 99%

Section: Teg Modelmentioning

confidence: 99%

Assessment and conceptual design of a SOFC / TIG / TEG ‐based hybrid propulsion system for a small UAV

Ren

2022

Intl J of Energy Research

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show abstract

“…Hence, it is a better choice to combine a thermal cycle-based generating system with a non-thermodynamic cycle power device. Thermoelectric generators (TEGs) [25,26], which are one of the nonthermodynamic cycle devices qualified to build combined power systems [27][28][29], have the potential to be combined with CBC on hypersonic vehicles. In previous research endeavors, a combined system that pairs a CBC with a TEG generator cooled by liquid methane has been proposed.…”

Section: Introductionmentioning

confidence: 99%

Performance Assessment of Closed-Brayton-Cycle and Thermoelectric Generator Combined Power Generation System Coupled with Hydrocarbon-Fueled Scramjet

Cheng,

Jing,

et al. 2023

Energies

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Closed-Brayton-cycle (CBC) is a potential scheme to provide high-power electricity for hypersonic vehicles, but finite cold source onboard limits its power level. A thermoelectric generator (TEG) combined with CBC is a feasible power enhancement approach by extending the available temperature range of cold source. In this study, a performance assessment of the CBC-TEG combined power generation system coupled with hydrocarbon-fueled scramjet is performed to exhibit its possible operation characteristics and performance limitations on hypersonic vehicles. Results indicate that, at a fixed flight Mach number, a larger fuel equivalence ratio (φ) leads to a higher total electric power and CBC power but a lower TEG power. There are three limitations on the fuel equivalence ratio, TEG temperature difference, and combustion heat dissipation adjustment for the operation of CBC-TEG. The total power of CBC-TEG can be adjusted by φ, but the adjustable range becomes smaller at higher Ma. The electric quantity at unit fuel mass increases with φ, mainly due to the higher thermoelectric conversion efficiency. Moreover, the maximum value of the electric quantity at unit fuel mass for CBC-TEG reaches 277.0 kJ/kg, which is about 33.4% higher than that of standalone CBC.

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Efficiency and economic assessment of wind turbine-powered pumped hydro-compressed air storage coupled with alkaline fuel cell using hybrid approach

Lakshmiprabha,

Kumar,

Pathak

et al. 2024

Clean Techn Environ Policy

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Numerical evaluation of energy system based on Fresnel concentrating solar collector, Stirling engine, and thermoelectric generator with electrical energy storage

Cited by 13 publications

References 45 publications

Assessment and conceptual design of a SOFC / TIG / TEG ‐based hybrid propulsion system for a small UAV

Assessment and conceptual design of a SOFC / TIG / TEG ‐based hybrid propulsion system for a small UAV

Performance Assessment of Closed-Brayton-Cycle and Thermoelectric Generator Combined Power Generation System Coupled with Hydrocarbon-Fueled Scramjet

Efficiency and economic assessment of wind turbine-powered pumped hydro-compressed air storage coupled with alkaline fuel cell using hybrid approach

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