The Experts below are selected from a list of 12903 Experts worldwide ranked by ideXlab platform
Jincan Chen - One of the best experts on this subject based on the ideXlab platform.
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universal efficiency bounds of weak dissipative Thermodynamic Cycles at the maximum power output
Physical Review E, 2013Co-Authors: Juncheng Guo, Junyi Wang, Yuan Wang, Jincan ChenAbstract:Based on the assumption of weak dissipation introduced by Esposito et al. [Phys. Rev. Lett. 105, 150603 (2010)], analytic expressions for the efficiency bounds of several classes of typical Thermodynamic Cycles at the maximum power output are derived. The results obtained are of universal significance. They can be used to conveniently reveal the general characteristics of not only Carnot heat engines, but also isothermal chemical engines, non-Carnot heat engines, flux flow engines, gravitational engines, quantum Carnot heat engines, and two-level quantum Carnot engines at the maximum power output and to directly draw many important conclusions in the literature.
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universal efficiency bounds of weak dissipative Thermodynamic Cycles at the maximum power output
Physical Review E, 2013Co-Authors: Junyi Wang, Yuan Wang, Jincan ChenAbstract:Specialized Research Fund for the Doctoral Program of Higher Education [20100121110024]; National Natural Science Foundation, People's Republic of China [11175148]
Denis Iglesias Garcia - One of the best experts on this subject based on the ideXlab platform.
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a review of Thermodynamic Cycles used in low temperature recovery systems over the last two years
Renewable & Sustainable Energy Reviews, 2018Co-Authors: Steven Iglesias Garcia, Ramon Ferreiro Garcia, Jose Carbia Carril, Denis Iglesias GarciaAbstract:Abstract This review explores the potential of low and medium grade heat in different Thermodynamic Cycles used to transform wasted heat into mechanical work. The aim of this review is to study the state of the art of the Thermodynamic Cycles used to recover low-grade heat. The relevance of researching low grade heat or waste heat applications is that a vast amount of heat energy is available at negligible cost within the range of medium and low temperatures, with the drawback that existing thermal Cycles cannot make efficient use of such available low temperature heat due to their low efficiency. The different types of Organic Rankine Cycles have been reviewed, highlighting their relevant characteristics where Simple Organic Rankine Cycle, Regenerative Organic Rankine Cycle, Cascade Organic Rankine Cycle, Organic Flash Cycles, Other Rankine Configurations and Trilateral Cycles are included. Reviews were conducted of specific applications of the low-grade heat recovery. In contrast, there are no actual publications which summarise the current state of the art of the Thermodynamic Cycles used to convert wasted heat into mechanical power. This paper offers a different approach and analyses low-grade heat recovery from a Thermodynamic point of view and compares their efficiency. The analysis shows that Cycles using closed processes are by far the most efficient published thermal Cycles for low-grade heat recovery. Rankine Cycles reviewed show similar low efficiencies. In contrast, closed process Cycles have a configuration, which allows efficient exploitation of low-grade heat.
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critical review of the first law efficiency in different power combined cycle architectures
Energy Conversion and Management, 2017Co-Authors: Steven Iglesias Garcia, Ramon Ferreiro Garcia, Jose Carbia Carril, Denis Iglesias GarciaAbstract:This critical review explores the potential of an innovative trilateral Thermodynamic cycle used to transform low-grade heat into mechanical work and compares its performance with relevant traditional Thermodynamic Cycles in combined Cycles. The aim of this work is to show that combined Cycles use traditional low efficiency power Cycles in their bottoming cycle, and to evaluate theoretically the implementation of alternative power bottoming Cycles. Different types of combined Cycles have been reviewed, highlighting their relevant characteristics. The efficiencies of power plants using combined Cycles are reviewed and compared. The relevance of researching Thermodynamic Cycles for combined cycle applications is that a vast amount of heat energy is available at negligible cost in the bottoming cycle of a combined cycle, with the drawback that existing thermal Cycles cannot make efficient use of such available low temperature heat due to their low efficiency. The first-law efficiency is used as a parameter to compare and suggest improvements in the combined Cycles (CCs) reviewed. The analysis shows that trilateral Cycles using closed processes are by far the most efficient published thermal Cycles for combined Cycles to transform low-grade heat into mechanical work. An innovative trilateral bottoming cycle is proposed to show that the application of non-traditional power Cycles can increase significantly the first-law efficiency of CCs. The highest first-law efficiencies achieved are: 85.55% in a CC using LNG cool, 73.82% for a transport vehicle CC, 74.40% in a marine CC, 83.07% in a CC for nuclear power plants, 73.82% in a CC using Brayton and Rankine Cycles, 78.31% in a CC with solar integration and 69.21% in a CC using gasification for combustion. Thus, this work shows that a trilateral cycle can be a starting point to explore new ways to convert energy.
Franco Nori - One of the best experts on this subject based on the ideXlab platform.
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Quantum Thermodynamic Cycles and quantum heat engines.
Physical Review E, 2007Co-Authors: H. T. Quan, Yu-xi Liu, Chang-pu Sun, Franco NoriAbstract:In order to describe quantum heat engines, here we systematically study isothermal and isochoric processes for quantum Thermodynamic Cycles. Based on these results the quantum versions of both the Carnot heat engine and the Otto heat engine are defined without ambiguities. We also study the properties of quantum Carnot and Otto heat engines in comparison with their classical counterparts. Relations and mappings between these two quantum heat engines are also investigated by considering their respective quantum Thermodynamic processes. In addition, we discuss the role of Maxwell's demon in quantum Thermodynamic Cycles. We find that there is no violation of the second law, even in the existence of such a demon, when the demon is included correctly as part of the working substance of the heat engine.
Elias Stefanakos - One of the best experts on this subject based on the ideXlab platform.
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a review of Thermodynamic Cycles and working fluids for the conversion of low grade heat
Renewable & Sustainable Energy Reviews, 2010Co-Authors: Huijuan Chen, Yogi D Goswami, Elias StefanakosAbstract:This paper presents a review of the organic Rankine cycle and supercritical Rankine cycle for the conversion of low-grade heat into electrical power, as well as selection criteria of potential working fluids, screening of 35 working fluids for the two Cycles and analyses of the influence of fluid properties on cycle performance. The Thermodynamic and physical properties, stability, environmental impacts, safety and compatibility, and availability and cost are among the important considerations when selecting a working fluid. The paper discusses the types of working fluids, influence of latent heat, density and specific heat, and the effectiveness of superheating. A discussion of the 35 screened working fluids is also presented.
Junyi Wang - One of the best experts on this subject based on the ideXlab platform.
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universal efficiency bounds of weak dissipative Thermodynamic Cycles at the maximum power output
Physical Review E, 2013Co-Authors: Juncheng Guo, Junyi Wang, Yuan Wang, Jincan ChenAbstract:Based on the assumption of weak dissipation introduced by Esposito et al. [Phys. Rev. Lett. 105, 150603 (2010)], analytic expressions for the efficiency bounds of several classes of typical Thermodynamic Cycles at the maximum power output are derived. The results obtained are of universal significance. They can be used to conveniently reveal the general characteristics of not only Carnot heat engines, but also isothermal chemical engines, non-Carnot heat engines, flux flow engines, gravitational engines, quantum Carnot heat engines, and two-level quantum Carnot engines at the maximum power output and to directly draw many important conclusions in the literature.
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universal efficiency bounds of weak dissipative Thermodynamic Cycles at the maximum power output
Physical Review E, 2013Co-Authors: Junyi Wang, Yuan Wang, Jincan ChenAbstract:Specialized Research Fund for the Doctoral Program of Higher Education [20100121110024]; National Natural Science Foundation, People's Republic of China [11175148]
