Results 21 to 30 of about 1,790 (131)

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

open access: yesCase 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

Chemical and Mechanical Aspect of Entropy-Exergy Relationship

open access: yesEntropy, 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

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

open access: yesEntropy, 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   +4 more
doaj   +1 more source

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

open access: yesEntropy, 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

Development of a Semi-Empirical Model for Estimating the Efficiency of Thermodynamic Power Cycles

open access: yesSci, 2023
Power plants constitute the main sources of electricity production, and the calculation of their efficiency is a critical factor that is needed in energy studies.
Evangelos Bellos
doaj   +1 more source

Metal Consumption of Heat Engines and Heat Capacity of their Working Fluids [PDF]

open access: yesProblems of the Regional Energetics, 2020
Ensuring efficient energy supply in general and heat supply in particular together with creation of air conditioning systems is a very urgent task of modern energy industry, particularly acute in the absence of large centralized energy sources.
Kiselev V.G.   +2 more
doaj   +1 more source

Quantum heat engines with Carnot efficiency at maximum power

open access: yesPhysical Review Research, 2022
Heat engines constitute the major building blocks of modern technologies. However, conventional heat engines with higher power yield lesser efficiency and vice versa and respect various power-efficiency trade-off relations.
Mohit Lal Bera   +3 more
doaj   +1 more source

Double Contour Thermodynamic Cycle with Unidirectional Heat Transfer between the Refrigeration and the Energy Cycle [PDF]

open access: yesProblems of the Regional Energetics, 2019
Practical characteristics of the method for improving cycles of complex cooling thermotrans-formers associated with the regeneration of the refrigeration cycle heat productivity (RCHP) are considered. The use of heat from the working fluid compression in
Gorpinko Yu.I.   +4 more
doaj   +1 more source

Carnot Cycles in a Harmonically Confined Ultracold Gas across Bose–Einstein Condensation

open access: yesEntropy, 2023
Carnot cycles of samples of harmonically confined ultracold 87Rb fluids, near and across Bose–Einstein condensation (BEC), are analyzed. This is achieved through the experimental determination of the corresponding equation of state in terms of the ...
Ignacio Reyes-Ayala   +6 more
doaj   +1 more source

Preliminary prospects of a Carnot-battery based on a supercritical CO2 Brayton cycle

open access: yesActa Polytechnica, 2021
As a part of the change towards a higher usage of renewable energy sources, which naturally deliver the energy intermittently, the need for energy storage systems is increasing. For the compensation of the disturbance in power production due to inter-day
Karin Rindt   +2 more
doaj   +1 more source

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