The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Fengrui Sun - One of the best experts on this subject based on the ideXlab platform.
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ecological performance of an endoreversible carnot heat engine with complex heat transfer law
International Journal of Sustainable Energy, 2011Co-Authors: Lingen Chen, Fengrui SunAbstract:The optimal ecological performance of an endoreversible Carnot engine, in which the transfer between the working fluid and the heat reservoirs obeys a complex heat transfer law, including generalized convective heat transfer law and generalized radiative heat transfer law, Q∝ (Δ T n ) m , is derived by taking into account an ecological Optimization Criterion as the objective function, which consists of maximizing a function representing the best compromise between the power output and entropy generation rate of the heat engine. The obtained results include the optimal ecological performance of the endoreversible Carnot heat engine with various heat transfer laws obtained in many studies.
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finite time exergoeconomic performance of an endoreversible carnot heat engine with complex heat transfer law
2011Co-Authors: Lingen Chen, Fengrui SunAbstract:The finite time exergoeconomic performance of an endoreversible Carnot heat engine with a complex heat transfer law, including generalized convective heat transfer law and generalized radiative heat transfer law, m n T q ) (∆ ∝ , is investigated in this paper. The finite time exergoeconomic performance Optimization of the engine is investigated by taking profit Optimization Criterion as the objective. The focus of this paper is to search the compromised Optimization between economics (profit) and the utilization factor (efficiency) for endoreversible Carnot heat engine cycles. The obtained results include those obtained in many literatures and can provide some theoretical guidance for the design of practical heat engines. Copyright © 2011 International Energy and Environment Foundation - All rights reserved.
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exergy based ecological Optimization of linear phenomenological heat transfer law irreversible carnot engines
Applied Energy, 2006Co-Authors: Xiao-qin Zhu, Fengrui SunAbstract:The optimal exergy-based ecological performance of a generalized irreversible Carnot-engine with losses due to heat-resistance, heat leakage and internal irreversibility, in which the heat-transfer between the working fluid and the heat reservoirs obeys a linear phenomenological heat-transfer law, is derived by taking an exergy-based ecological Optimization Criterion as the objective. This consists of maximizing a function representing the best compromise between the power output and entropy-production rate of the heat engine. A numerical example is given to show the effects of heat leakage and internal irreversibility on the optimal performance of the generalized irreversible heat-engine. The results provide theoretical guidance for the design of practical engines.
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ecological Optimization performance of an irreversible quantum otto cycle working with an ideal fermi gas
Open Systems & Information Dynamics, 2006Co-Authors: Lingen Chen, Fengrui Sun, Fangzhong GuoAbstract:The model of an irreversible Otto cycle using an ideal Fermi gas as the working fluid, which is called as the irreversible Fermi Otto cycle, is established in this paper. Based on the equation of state of an ideal Fermi gas, the ecological Optimization performance of an irreversible Fermi Otto cycle is examined by taking an ecological Optimization Criterion as the objective, which consists of maximizing a function representing the best compromise between the exergy output and exergy loss (entropy production) of the cycle. The relationship between the ecological function E and the efficiency ? is studied. Three special cases are discussed in detail. The results obtained herein may reveal the general performance characteristics of the irreversible Fermi Otto cycle.
Bahri Sahin - One of the best experts on this subject based on the ideXlab platform.
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Optimization of a regenerative gas turbine cogeneration system based on a new exergetic performance Criterion exergetic performance coefficient
Proceedings of the Institution of Mechanical Engineers Part A: Journal of Power and Energy, 2007Co-Authors: Bahri Sahin, Tamer YilmazAbstract:AbstractA performance analysis and an Optimization based on a new exergetic performance Criterion named exergetic performance coefficient (EPC) have been carried out for an irreversible regenerative gas-turbine cogeneration system. The EPC objective function defined as the total exergy output per unit loss rate of availability is taken as the Optimization Criterion. The design parameters and performances under optimal conditions have been investigated and the results obtained are compared with those obtained using the alternative criteria given in the literature. It is shown that for the regenerative gas-turbine cogeneration system, a design based on the maximum EPC conditions is more advantageous from the viewpoint of entropy generation rate, exergy efficiency, and investment cost.
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performance Optimization of irreversible refrigerators based on a new thermo ecological Criterion
International Journal of Refrigeration-revue Internationale Du Froid, 2007Co-Authors: Yasin Ust, Bahri SahinAbstract:A performance analysis and Optimization based on a new thermo-ecological Optimization Criterion has been carried out for refrigerators. The ecological objective function is defined as the ratio of the cooling load to the loss rate of availability (or entropy generation rate). The maximum of the ecological performance Criterion and the corresponding optimal conditions have been derived analytically. The optimum performance parameters which maximize the objective function have been investigated and the effects of irreversibility parameters on the general and optimal performances are discussed detailed. The obtained results may provide a general theoretical tool for the ecological design of refrigerators.
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performance analysis of an endoreversible heat engine based on a new thermoeconomic Optimization Criterion
Energy Conversion and Management, 2001Co-Authors: Bahri Sahin, Ali KodalAbstract:A new kind of finite time thermoeconomic Optimization analysis for an endoreversible heat engine has been performed. The objective function has been taken as the power output per unit total cost. The optimum performance parameters that maximize the objective function are investigated. In this perspective, some analytical equations for the optimum working fluid temperatures, optimum thermal efficiency, optimal distributions of heat exchanger areas and optimum specific power output were found in terms of economical and technical parameters. The effects of the design parameters on the optimal conditions have been discussed.
L Proslier - One of the best experts on this subject based on the ideXlab platform.
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optimal location of actuators and sensors in active vibration control
Journal of Intelligent Material Systems and Structures, 2005Co-Authors: I Bruant, L ProslierAbstract:Several studies have been conducted in order to find the optimal location of actuators and sensors in the active vibration control of structures. In this paper, a modified Optimization Criterion is proposed for these two Optimization problems, ensuring good observability or good controllability of the structure, and considering residual modes to limit the spill-over effects. Its efficiency is shown by the comparison with the classical criteria, illustrated for a simply supported beam and a rectangular plate. In these two applications, the number of active elements is discussed, using or neglecting the residual modes.
Paul Cotae - One of the best experts on this subject based on the ideXlab platform.
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transmitter adaptation algorithm for multicellular synchronous ds cdma systems with multipath
IEEE Journal on Selected Areas in Communications, 2006Co-Authors: Paul CotaeAbstract:A procedure for the design of complex sequence/signature sets for a multicell system under synchronous multipath transmission is presented. The Optimization Criterion is the total weighted square correlation (TWSC) that incorporates transmission power and channel impulse response values. By solving an inverse eigenvalue problem related to block structured matrices, the bandwidth of initial generalized Welch bound equality signals is preserved in the extended signal space associated to multiple cell system. Numerical results for overloaded uplink multicellular direct-sequence code-division multiple-access (DS-CDMA) systems are presented in order to support our analysis.
Visvanathan Ramesh - One of the best experts on this subject based on the ideXlab platform.
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matching distance functions a shape to area variational approach for global to local registration
European Conference on Computer Vision, 2002Co-Authors: Nikos Paragios, Mikael Rousson, Visvanathan RameshAbstract:This paper deals with the matching of geometric shapes. Our primary contribution is the use of a simple, robust, rich and efficient way to represent shapes, the level set representations according to singed distance transforms. Based on these representations we propose a variational framework for global as well as local shape registration that can be extended to deal with structures of higher dimension. The Optimization Criterion is invariant to rotation, translation and scale and combines efficiently a global motion model with local pixel-wise deformations. Promising results are obtained on examples showing small and large global deformations as well as arbitrary topological changes.
