Results 21 to 30 of about 17,485 (243)

Limiting Performance of the Ejector Refrigeration Cycle with Pure Working Fluids

Entropy, 2023
An ejector refrigeration system is a promising heat-driven refrigeration technology for energy consumption. The ideal cycle of an ejector refrigeration cycle (ERC) is a compound cycle with an inverse Carnot cycle driven by a Carnot cycle. The coefficient
Jiawei Fu, Zhenhua Liu, Xingyang Yang, Sumin Jin, Jilei Ye   +4 more
doaj   +1 more source

Quantum thermodynamic Carnot and Otto-like cycles for a two-level system [PDF]

, 2007
From the thermodynamic equilibrium properties of a two-level system with variable energy-level gap $\Delta$, and a careful distinction between the Gibbs relation $dE = T dS + (E/\Delta) d\Delta$ and the energy balance equation $dE = \delta Q^\leftarrow -
Allahverdyan A. E., Bender C. M., Beretta G. P., Beretta G. P., Gian Paolo Beretta, Gyftopoulos E. P.   +5 more
core   +2 more sources

The Principle of Least Action for Reversible Thermodynamic Processes and Cycles

Entropy, 2018
The principle of least action, which is usually applied to natural phenomena, can also be used in optimization problems with manual intervention. Following a brief introduction to the brachistochrone problem in classical mechanics, the principle of least
Tian Zhao, Yu-Chao Hua, Zeng-Yuan Guo
doaj   +1 more source

Thermodynamic analysis of general heat engine cycle with finite heat capacity rates for power maximization

Case Studies in Thermal Engineering, 2022
In this study, the ideal cycles with finite heat capacity rates is investigated theoretically to maximize power generation using a sequential Carnot cycle model.
Soyeon Kim, Young-Jin Baik, Minsung Kim
doaj   +1 more source

Efficiency at maximum power of low dissipation Carnot engines [PDF]

, 2010
We study the efficiency at maximum power, $\eta^*$, of engines performing finite-time Carnot cycles between a hot and a cold reservoir at temperatures $T_h$ and $T_c$, respectively.
A. Bejan, A. Bejan, Christian Van den Broeck, H. B. Callen, I. I. Novikov, Katja Lindenberg, Massimiliano Esposito, P. Chambadal, R. S. Berry, Ryoichi Kawai   +9 more
core   +2 more sources

Brownian Carnot engine [PDF]

, 2015
The Carnot cycle imposes a fundamental upper limit to the efficiency of a macroscopic motor operating between two thermal baths. However, this bound needs to be reinterpreted at microscopic scales, where molecular bio-motors and some artificial micro ...
A Bérut, D. Petrov, E Roldán, E Roldán, F Curzon, G Verley, G Verley, GE Crooks, GM Wang, H Ouerdane, I. A. Martínez, IA Martínez, IA Martínez, J Gieseler, J Gieseler, J Howard, J Millen, J Roßnagel, J. M. R. Parrondo, JV Koski, K Proesmans, K Sekimoto, K Sekimoto, K Sekimoto, L. Dinis, M Esposito, M Polettini, M Sarikaya, MVS Bonanca, P Mestres, R Feynman, R. A. Rica, S Carnot, S Toyabe, SM Douglas, TR Gingrich, U Seifert, V Blickle, É. Roldán   +38 more
core   +3 more sources

Chemical and Mechanical Aspect of Entropy-Exergy Relationship

Entropy, 2021
The present research focuses the chemical aspect of entropy and exergy properties. This research represents the complement of a previous treatise already published and constitutes a set of concepts and definitions relating to the entropy–exergy ...
Pierfrancesco Palazzo
doaj   +1 more source

Onsager coefficients of a finite-time Carnot cycle [PDF]

, 2009
We study a finite-time Carnot cycle of a weakly interacting gas which we can regard as a nearly ideal gas in the limit of $T_\mathrm{h}-T_\mathrm{c}\to 0$ where $T_\mathrm{h}$ and $T_\mathrm{c}$ are the temperatures of the hot and cold heat reservoirs ...
Izumida, Yuki, Okuda, Koji
core   +2 more sources

Optimization Modeling of Irreversible Carnot Engine from the Perspective of Combining Finite Speed and Finite Time Analysis

Entropy, 2021
An irreversible Carnot cycle engine operating as a closed system is modeled using the Direct Method and the First Law of Thermodynamics for processes with Finite Speed.
Monica Costea, Stoian Petrescu, Michel Feidt, Catalina Dobre, Bogdan Borcila   +4 more
doaj   +1 more source

Comments on “The Principle of Least Action for Reversible Thermodynamic Processes and Cycles”, Entropy 2018, 20, 542

Entropy, 2018
The goal of this comment note is to express my concerns about the recent paper by Tian Zhao et al. (Entropy 2018, 20, 542). It is foreseen that this comment will stimulate a fruitful discussion of the issues involved.
Edward Bormashenko
doaj   +1 more source