Efficiency, power, and period at two optimum operations of a thermoelectric single-level quantum dot

Borga, Fitsum; Bekele, Mulugeta; Tatek, Yergou B.; Tsige, Mesfin

doi:10.1103/physreve.86.032106

Cited by 8 publications

(13 citation statements)

References 18 publications

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“…Among different optimization regimes, the efficiency at maximum power η maxP has been playing an important role for studies of traditional [11,32,33,[35][36][37][38][39][40][41], stochastic [31,[42][43][44][45][46][47][48], and quantum [49][50][51][52][53][54][55] HE. The maximum power and the efficiency at the maximum power η maxP of the present model, which were studied in Ref.…”

Section: A Optimized Regimes: Hementioning

confidence: 99%

Heat devices in nonlinear irreversible thermodynamics

et al. 2015

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We present results obtained by using nonlinear irreversible models for heat devices. In particular, we focus on the global performance characteristics, the maximum efficiency and the efficiency at maximum power regimes for heat engines, and the maximum coefficient of performance (COP) and the COP at maximum cooling power regimes for refrigerators. We analyze the key role played by the interplay between irreversibilities coming from heat leaks and internal dissipations. We also discuss the relationship between these results and those obtained by different models.

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Section: A Optimized Regimes: Hementioning

confidence: 99%

Heat devices in nonlinear irreversible thermodynamics

et al. 2015

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“…They studied efficiency, power, and period at two optimum operations of a thermoelectric single-level quantum dot in the absence of stochastic external forces. With time, researchers [27] take a single-level quantum dot embedded between two metallic leads at different temperatures and chemical potentials as a heat engine. They studied efficiency, power, and period at two optimum operations of a thermoelectric single-level quantum dot in the absence of stochastic external forces [27].…”

Section: Introductionmentioning

confidence: 99%

“…With time, researchers [27] take a single-level quantum dot embedded between two metallic leads at different temperatures and chemical potentials as a heat engine. They studied efficiency, power, and period at two optimum operations of a thermoelectric single-level quantum dot in the absence of stochastic external forces [27]. Besides, the optimized efficiency of a stochastically driven quantum dot heat engine was presented in Refs.…”

Section: Introductionmentioning

confidence: 99%

Optimized Efficiency at Two Optimum Operations of a Stochastically Driven Quantum Dot Heat Engine

Bassie

Birhanu

Abebe

et al. 2022

Advances in Mathematical Physics

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We take a stochastically driven single-level quantum dot embedded between two metallic leads at different temperatures works as a heat engine. We numerically study the optimized efficiency at two optimum operations, which lies between the maximum and minimum efficiency. The minimum efficiency either takes the efficiency value at maximum power or the lowest possible value, zero. Using a unified criterion for energy converters, we find the optimum working condition for the heat engine. We study the optimized efficiency of a quantum dot heat engine according to the optimization criteria to find their corresponding optimized quantities in an external magnetic field (stochastic driving force). Accordingly, we found (1) efficiency-wise, optimized efficiency is better than efficiency at maximum power; (2) power-wise, the optimized power is smaller than its value at maximum power by 35 % ; and (3) period-wise, it performs the task in a cycle twice that of the period at maximum power. We study the overall performance of the heat engine by introducing a figure of merit that considers the contribution of each of the above quantities as a function of Carnot efficiency. Based on the proposed figure of merit, the model shows that the second optimization criteria are 3 times better than the first optimization criteria as a function of Carnot efficiency.

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“…On the contrary, the maximization of the corresponding useful energy (power output for heat engines [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], cooling rate for refrigerators and heating rate for heat pumps [1-3, 18-22]) gives operation regimes which do not necessarily involve either entropy generation constraints or efficiency increase. As a consequence, the optimization of heat devices based on a compromise (trade-off) between energy benefits and unavoidable losses by irreversibilities has been frequently used [2,3,23]. Among them, some of us and coworkers proposed the so-called Ω criterion which represents a compromise between energy benefits and losses for a specific job.…”

Section: Introductionmentioning

confidence: 99%

Low-dissipation heat devices: Unified trade-off optimization and bounds

et al. 2013

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We apply a unified and trade-off based optimization for low-dissipation models of cyclic heat devices which accounts for both useful energy and losses. The resulting performance regime lies between those of maximum first-law efficiency and maximum χ (a unified figure of merit corresponding to power output of heat engines). The bounds available for both symmetric and extremely asymmetric heat devices are explicitly obtained. The similarities for heat engines and refrigerators and the energetic advantages of the trade-off optimization are specially stressed.

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Efficiency, power, and period at two optimum operations of a thermoelectric single-level quantum dot

Cited by 8 publications

References 18 publications

Heat devices in nonlinear irreversible thermodynamics

Heat devices in nonlinear irreversible thermodynamics

Optimized Efficiency at Two Optimum Operations of a Stochastically Driven Quantum Dot Heat Engine

Low-dissipation heat devices: Unified trade-off optimization and bounds

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