Related papers: Maximal power for heat engines: role of asymmetric interaction times

Maximal power for heat engines: role of asymmetric interaction times

URL: http://arxiv.org/abs/2012.09296v2
Date: Wed, 5 May 2021 12:53:55 GMT
Title: Maximal power for heat engines: role of asymmetric interaction times
Authors: Pedro E. Harunari, Fernando S. Filho, Carlos E. Fiore, and Alexandre Rosas
Abstract summary: We introduce the idea of adjusting the interaction time asymmetry in order to optimize the engine performance. Distinct optimization protocols are analyzed in the framework of thermodynamics.
Score: 110.83289076967895
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: The performance of endoreversible thermal machines operating at finite power constitutes one of the main challenges of nonequilibrium classical and quantum thermodynamics, engineering and others. We introduce the idea of adjusting the interaction time asymmetry in order to optimize the engine performance. We consider one of the simplest thermal machines, composed of a quantum dot interacting sequentially with two different reservoirs of heat and particles. Distinct optimization protocols are analyzed in the framework of stochastic thermodynamics. Results reveal that asymmetric interaction times play a fundamental role in enhancing the power output and that maximizations can provide an increase larger than 25\% the symmetric case. As an extra advantage, efficiencies at maximum power are slightly greater than the endoreversible Curzon-Ahlborn efficiency for a broad range of reservoir temperatures.

Related papers

Thermodynamic Roles of Quantum Environments: From Heat Baths to Work Reservoirs [49.1574468325115]
Environments in quantum thermodynamics usually take the role of heat baths. We show that within the same model, the environment can take three different thermodynamic roles. The exact role of the environment is determined by the strength and structure of the coupling.
arXiv Detail & Related papers (2024-08-01T15:39:06Z)
Quantum thermodynamics of the spin-boson model using the principle of minimal dissipation [41.94295877935867]
We investigate the influence of the environment on quantities such as work, heat and entropy production. The results reveal significant differences to the weak-coupling forms of work, heat and entropy production.
arXiv Detail & Related papers (2024-04-18T12:11:18Z)
Efficiency and thermodynamic uncertainty relations of a dynamical quantum heat engine [0.0]
We show that parameters can be found such that the machine operates both as a quantum engine or refrigerator. We show that parameters can be found such that the machine operates both as a quantum engine or refrigerator, with both sizeable efficiency and small fluctuations.
arXiv Detail & Related papers (2023-03-28T07:30:34Z)
Powerful ordered collective heat engines [58.720142291102135]
We introduce a class of engines in which the regime of units operating synchronously can boost the performance. We show that the interplay between Ising-like interactions and a collective ordered regime is crucial to operate as a heat engine.
arXiv Detail & Related papers (2023-01-16T20:14:19Z)
Universal optimization efficiency and bounds of Carnot-like heat engines and refrigerators under shortcuts to isothermality [14.447246922181003]
We derive the universal optimization efficiency of heat engines and the optimization of performance of refrigerators under two unified optimization criterions. We also derived the universal lower and upper bounds for heat engines and refrigerators, and found that these bounds can be reached under extremely asymmetric cases.
arXiv Detail & Related papers (2022-11-02T02:23:24Z)
Gauge Quantum Thermodynamics of Time-local non-Markovian Evolutions [77.34726150561087]
We deal with a generic time-local non-Markovian master equation. We define current and power to be process-dependent as in classical thermodynamics. Applying the theory to quantum thermal engines, we show that gauge transformations can change the machine efficiency.
arXiv Detail & Related papers (2022-04-06T17:59:15Z)
Driven quantum harmonic oscillators: A working medium for thermal machines [0.0]
We consider a working substance that is permanently coupled to two or more baths at different temperatures and continuously driven. We derive the heat flows and power of the working device which can operate as an engine, refrigerator or accelerator. An increased driving frequency can lead to a change of functioning to a dissipator.
arXiv Detail & Related papers (2021-08-25T16:53:45Z)
Collective effects on the performance and stability of quantum heat engines [62.997667081978825]
Recent predictions for quantum-mechanical enhancements in the operation of small heat engines have raised renewed interest. One essential question is whether collective effects may help to carry enhancements over larger scales. We study how power, efficiency and constancy scale with the number of spins composing the engine.
arXiv Detail & Related papers (2021-06-25T18:00:07Z)
Maximum power heat engines and refrigerators in the fast-driving regime [1.3999481573773072]
We study the optimization of the performance of periodically driven thermal machines. We derive the optimal cycle that universally maximizes the extracted power of heat engines, the cooling power of refrigerators, and in general any linear combination of the heat currents.
arXiv Detail & Related papers (2020-10-01T17:56:57Z)

This list is automatically generated from the titles and abstracts of the papers in this site.