Micro-/nanoscaled irreversible Otto engine cycle with friction loss and boundary effects and its performance characteristics

Nie, Wenjie; Liao, Qinghong; Zhang, ChunQiang; He, Jizhou

doi:10.1016/j.energy.2010.09.039

Cited by 26 publications

(5 citation statements)

References 27 publications

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“…So in [102][103][104][134][135][136][137], the power output and efficiency performance characteristics [102][103][104][134][135][136], as well as the EF performance characteristic [137] of irreversible Otto cycles were studied when the quantum characteristic of WF was considered, and the influence of the quantum characteristic on cycle performance was investigated.…”

Section: The Progress In Optimum Performance Studies For As Otto Cyclesmentioning

confidence: 99%

Progress in Finite Time Thermodynamic Studies for Internal Combustion Engine Cycles

Chen

Sun

2016

Entropy

139

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Abstract:On the basis of introducing the origin and development of finite time thermodynamics (FTT), this paper reviews the progress in FTT optimization for internal combustion engine (ICE) cycles from the following four aspects: the studies on the optimum performances of air standard endoreversible (with only the irreversibility of heat resistance) and irreversible ICE cycles, including Otto, Diesel, Atkinson, Brayton, Dual, Miller, Porous Medium and Universal cycles with constant specific heats, variable specific heats, and variable specific ratio of the conventional and quantum working fluids (WFs); the studies on the optimum piston motion (OPM) trajectories of ICE cycles, including Otto and Diesel cycles with Newtonian and other heat transfer laws; the studies on the performance limits of ICE cycles with non-uniform WF with Newtonian and other heat transfer laws; as well as the studies on the performance simulation of ICE cycles. In the studies, the optimization objectives include work, power, power density, efficiency, entropy generation rate, ecological function, and so on. The further direction for the studies is explored.

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Section: The Progress In Optimum Performance Studies For As Otto Cyclesmentioning

confidence: 99%

Progress in Finite Time Thermodynamic Studies for Internal Combustion Engine Cycles

Chen

Sun

2016

Entropy

139

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“…With the development of new technology and the demand for energy, micro-scale energy conversion devices have gradually attracted the interest of scholars. A great deal of literature has applied FTT theory to study the thermodynamic performance of HEs such as Brownian motor [ 51 , 52 ] and micro-/nanoscaled energy conversion systems [ 53 , 54 ]. FTT theory is also extended to the study of quantum heat engines (QHE).…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis and Optimization for Irreversible Combined Carnot Heat Engine Working with Ideal Quantum Gases

Chen

Meng

et al. 2021

Entropy

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An irreversible combined Carnot cycle model using ideal quantum gases as a working medium was studied by using finite-time thermodynamics. The combined cycle consisted of two Carnot sub-cycles in a cascade mode. Considering thermal resistance, internal irreversibility, and heat leakage losses, the power output and thermal efficiency of the irreversible combined Carnot cycle were derived by utilizing the quantum gas state equation. The temperature effect of the working medium on power output and thermal efficiency is analyzed by numerical method, the optimal relationship between power output and thermal efficiency is solved by the Euler-Lagrange equation, and the effects of different working mediums on the optimal power and thermal efficiency performance are also focused. The results show that there is a set of working medium temperatures that makes the power output of the combined cycle be maximum. When there is no heat leakage loss in the combined cycle, all the characteristic curves of optimal power versus thermal efficiency are parabolic-like ones, and the internal irreversibility makes both power output and efficiency decrease. When there is heat leakage loss in the combined cycle, all the characteristic curves of optimal power versus thermal efficiency are loop-shaped ones, and the heat leakage loss only affects the thermal efficiency of the combined Carnot cycle. Comparing the power output of combined heat engines with four types of working mediums, the two-stage combined Carnot cycle using ideal Fermi-Bose gas as working medium obtains the highest power output.

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“…Consequently, it is important to develop a model to consider both effects and then isolate one from another mathematically for their possible experimental verifications. In recent years, there are some studies on thermodynamic analysis of conceptual thermosize cycles as well as some new cycles based on QTSE and CTSE [20][21][22][23][24][25][26][27][28][29]. All these studies consider either CTSE or QTSE alone although they coexist in general and the derivations are based on only weakly confined ideal atomic gases.…”

Section: Introductionmentioning

confidence: 99%

Thermosize potentials in semiconductors

Karabetoglu

Şişman

2017

Physics Letters A

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A thermosize junction consists of two different sized structures made by the same material. Classical and quantum thermosize effects (CTSE and QTSE), which are opposite to each other, induce a thermosize potential in a thermosize junction. A semi-analytical method is proposed to calculate thermosize potentials in wide ranges of degeneracy and confinement by considering both CTSE and QTSE in thermosize junctions made by semiconductors. Dependencies of thermosize potential on temperature, size and degeneracy are examined. It is shown that a potential difference in millivolt scale can be induced as a combined effect of CTSE and QTSE. The highest potential is obtained in non-degenerate limit where the full analytical solution is obtained. The model can be used to design semiconductor thermosize devices for a possible experimental verification of CTSE and QTSE, which may lead to new nano energy conversion devices.

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Micro-/nanoscaled irreversible Otto engine cycle with friction loss and boundary effects and its performance characteristics

Cited by 26 publications

References 27 publications

Progress in Finite Time Thermodynamic Studies for Internal Combustion Engine Cycles

Progress in Finite Time Thermodynamic Studies for Internal Combustion Engine Cycles

Performance Analysis and Optimization for Irreversible Combined Carnot Heat Engine Working with Ideal Quantum Gases

Thermosize potentials in semiconductors

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