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Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Exergy-based methodology"

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Bou Malham, Zoughaib, Tinoco, and Schuhler. "Hybrid Optimization Methodology (Exergy/Pinch) and Application on a Simple Process." Energies 12, no. 17 (August 28, 2019): 3324. http://dx.doi.org/10.3390/en12173324.

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Анотація:
In the light of the alarming impending energy scene, energy efficiency and exergy efficiency are unmistakably gathering momentum. Among efficient process design methodologies, literature suggests pinch analysis and exergy analysis as two powerful thermodynamic methods, each showing certain drawbacks, however. In this perspective, this article puts forward a methodology that couples pinch and exergy analysis in a way to surpass their individual limitations in the aim of generating optimal operating conditions and topology for industrial processes. Using new optimizing exergy‐based criteria, exergy analysis is used not only to assess the exergy but also to guide the potential improvements in industrial processes structure and operating conditions. And while pinch analysis considers only heat integration to satisfy existent needs, the proposed methodology allows including other forms of recoverable exergy and explores new synergy pathways through conversion systems. A simple case study is proposed to demonstrate the applicability and efficiency of the proposed method.
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2

Doty, John H., José A. Camberos, and David J. Moorhouse. "Benefits of Exergy-Based Analysis for Aerospace Engineering Applications—Part I." International Journal of Aerospace Engineering 2009 (2009): 1–11. http://dx.doi.org/10.1155/2009/409529.

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This paper compares the analysis of systems from two different perspectives: an energy-based focus and an exergy-based focus. A complex system was simply modeled as interacting thermodynamic systems to illustrate the differences in analysis methodologies and results. The energy-based analysis had combinations of calculated states that are infeasible. On the other hand, the exergy-based analyses only allow feasible states. More importantly, the exergy-based analyses provide clearer insight to the combination of operating conditions for optimum system-level performance. The results strongly suggest changing the analysis/design paradigm used in aerospace engineering from energy-based to exergy-based. This methodology shift is even more critical in exploratory research and development where previous experience may not be available to provide guidance. Although the models used herein may appear simplistic, the message is very powerful and extensible to higher-fidelity models: the 1st Law is only anecessarycondition for design, whereas the 1st and 2nd Laws provide thesufficiencycondition.
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Eydner, Matthias, Lu Wan, Tobias Henzler, and Konstantinos Stergiaropoulos. "Real-Time Grid Signal-Based Energy Flexibility of Heating Generation: A Methodology for Optimal Scheduling of Stratified Storage Tanks." Energies 15, no. 5 (February 28, 2022): 1793. http://dx.doi.org/10.3390/en15051793.

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Heat pumps coupled with thermal energy storage (TES) systems are seen as a promising technology for load management that can be used to shift peak loads to off-peak hours. Most of the existing model predictive control (MPC) studies on tariff-based load shifting deploying hot water tanks use simplified tank models. In this study, an MPC framework that accounts for transient thermal behavior (i.e., mixing and stratification) by applying energy (EMPC) and exergy (XMPC) analysis is proposed. A case study for an office building equipped with an air handling unit (AHU) revealed that the MPC strategy had a high load-shifting capacity: over 80% of the energy consumption took place during off-peak hours when there was an electricity surplus in the grid. An analysis of a typical day showed that the XMPC method was able to provide more appropriate stratification within the TES for all load characteristics. An annual exergy analysis demonstrated that, during cold months, energy degradation in the TES is mainly caused by exergy destruction due to irreversibility, while, during the transition to milder months, exergy loss dominates. Compared to the EMPC approach, the XMPC strategy achieves additional reductions of 18% in annual electricity consumption, 13% in operating costs, and almost 17% in emissions.
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Sejkora, Christoph, Lisa Kühberger, Fabian Radner, Alexander Trattner, and Thomas Kienberger. "Exergy as Criteria for Efficient Energy Systems—A Spatially Resolved Comparison of the Current Exergy Consumption, the Current Useful Exergy Demand and Renewable Exergy Potential." Energies 13, no. 4 (February 14, 2020): 843. http://dx.doi.org/10.3390/en13040843.

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Анотація:
The energy transition from fossil-based energy sources to renewable energy sources of an industrialized country is a big challenge and needs major systemic changes to the energy supply. Such changes require a holistic view of the energy system, which includes both renewable potentials and consumption. Thereby exergy, which describes the quality of energy, must also be considered. In this work, the determination and analysis of such a holistic view of a country are presented, using Austria as an example. The methodology enables the calculation of the spatially resolved current exergy consumption, the spatially resolved current useful exergy demand and the spatially resolved technical potential of renewable energy sources (RES). Top-down and bottom-up approaches are combined in order to increase accuracy. We found that, currently, Austria cannot self-supply with exergy using only RES. Therefore, Austria should increase the efficiency of its energy system, since the overall exergy efficiency is only at 34%. The spatially resolved analysis shows that in Austria the exergy potential of RES is rather evenly distributed. In contrast, the exergy consumption is concentrated in urban and industrial areas. Therefore, the future energy infrastructure must compensate for these spatial discrepancies.
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Voloshchuk, Volodymyr, Paride Gullo, Eugene Nikiforovich, and Nadia Buyak. "Simulation and Exergy Analysis of a Refrigeration System Using an Open-Source Web-Based Interactive Tool—Comparison of the Conventional Approach and a Novel One for Avoidable Exergy Destruction Estimation." Applied Sciences 11, no. 23 (December 6, 2021): 11535. http://dx.doi.org/10.3390/app112311535.

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Avoidable endogenous/exogenous parts of the exergy destruction in the components of an energy conversion system can be computed by applying advanced exergy analysis. Their calculation is crucial for the correct assessment of the real thermodynamic enhancement achievable by the investigated energy conversion system. This work proposes a new approach to estimate the avoidable exergy destruction rates of system components, being more rigorous compared to the conventional method due to the elimination of the need for the implementation of theoretical assumptions associated with the idealization of processes. An open-source web-based interactive tool was implemented to contrast the results of the conventional advanced exergy analysis to those involving the new approach for avoidable exergy destruction estimation. The comparison was based on the same case study, i.e., a refrigeration system selected from the literature. It was observed that the developed tool can be properly employed for comparing the two approaches within exergy analyses, and the results obtained presented some differences for the compressor and the condenser. Compared to the new approach, the existing methodology of advanced exergy analysis suggests lower values of the avoidable part of exergy destruction, which can be reduced by improving the efficiency of the compressor and the condenser. Moreover, the avoidable parts of exergy destruction, which could be removed within these components by improving the efficiencies of the remaining components, were higher in the case of the application of the existing advanced exergetic analysis as compared with the findings obtained by the proposed approach. These differences were due to the impossibility of the existing advanced exergy analysis to implement complete thermodynamic “idealization” for the condenser and evaporator.
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Voloshchuk, Volodymyr, and Mariya Polishchuk. "EXERGY-BASED CONTROL STRATEGY IN A DWELLING VENTILATION SYSTEM WITH HEAT RECOVERY." Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska 10, no. 2 (June 30, 2020): 44–47. http://dx.doi.org/10.35784/iapgos.933.

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The paper presents energy and exergy analysis of a typical dwelling ventilation system with heat recovery for Ukrainian climatic conditions using a quasi-steady state approach over 24-hour time-steps. Evaluation of such systems on the base of the first law of thermodynamics demonstrates that heat recovery is beneficial for the whole variety of operational modes. Such methodology identifies as a thermodynamic inefficiency only energy losses to the surroundings with the exhaust air. The exergy-based analysis can detect additional inefficiencies due to irreversibilities within the components of the system. As a result the exergetic investigations show that for the ventilation systems there are operating conditions for which heat recovery increases exergy of fuel expended to provide the ventilation air compared to cases without bringing any recovery of heat and additional power consumption to drive the air flow by the fans. For the specified system, in case of switching ventilation unit to the operation mode of lower values of spent fuel exergy it is possible to provide annual saving of the primary energy sources from 5 to 15%.
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Salahshoor, Karim, and M. H. Asheri. "A new exergy-based model predictive control methodology for energy assessment and control." Journal of Natural Gas Science and Engineering 21 (November 2014): 489–95. http://dx.doi.org/10.1016/j.jngse.2014.08.024.

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Kallio, Sonja, and Monica Siroux. "Exergy and Exergy-Economic Approach to Evaluate Hybrid Renewable Energy Systems in Buildings." Energies 16, no. 3 (January 17, 2023): 1029. http://dx.doi.org/10.3390/en16031029.

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Hybrid renewable energy systems (HRES) combine two or more renewable energy systems and are an interesting solution for decentralized renewable energy generation. The exergy and exergo-economic approach have proven to be useful methods to analyze hybrid renewable energy systems. The aim of this paper is to present a review of exergy and exergy-economic approaches to evaluate hybrid renewable energy systems in buildings. In the first part of the paper, the methodology of the exergy and exergo-economic analysis is introduced as well as the main performance indicators. The influence of the reference environment is analyzed, and results show that the selection of the reference environment has a high impact on the results of the exergy analysis. In the last part of the paper, different literature studies based on exergy and exergo-economic analysis applied to the photovoltaic-thermal collectors, fuel-fired micro-cogeneration systems and hybrid renewable energy systems are reviewed. It is shown that the dynamic exergy analysis is the best way to evaluate hybrid renewable energy systems if they are operating under a dynamic environment caused by climatic conditions and/or energy demand.
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Dinc, Ali, Yasin Şöhret, and Selcuk Ekici. "Exergy analysis of a three-spool turboprop engine during the flight of a cargo aircraft." Aircraft Engineering and Aerospace Technology 92, no. 10 (July 29, 2020): 1495–503. http://dx.doi.org/10.1108/aeat-05-2020-0087.

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Анотація:
Purpose This study aims to introduce exergy analysis of a three-spool turboprop engine during the complete flight. Design/methodology/approach In this study, a flight scenario of the aircraft is assumed. Operating parameters of the aircraft and its engine are modelled based on the assumed flight scenario with the aid of a genuine code. And then performance analysis of the engine is performed for each flight path point with the aid of exergy. Findings At the end of the study, major exergy parameters of the engine are calculated during the complete flight of a cargo aircraft three-spool turboprop engine. Practical implications Findings of the study may be beneficial for industry and practitioners to improve performance of the evaluated engine. Originality/value To the best of authors’ knowledge, this paper presented the exergy analysis of a three-spool turboprop engine during the complete flight for the first time. It was shown how the exergy destruction rate depends on the altitude and manoeuvre.
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Jane, Robert, Tae Young Kim, Emily Glass, Emilee Mossman, and Corey James. "Tailoring Mission Effectiveness and Efficiency of a Ground Vehicle Using Exergy-Based Model Predictive Control (MPC)." Energies 14, no. 19 (September 23, 2021): 6049. http://dx.doi.org/10.3390/en14196049.

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Анотація:
To ensure dominance over a multi-domain battlespace, energy and power utilization must be accurately characterized for the dissimilar operational conditions. Using MATLAB/Simulink in combination with multiple neural networks, we created a methodology which was simulated the energy dynamics of a ground vehicle in parallel to running predictive neural network (NN) based predictive algorithms to address two separate research questions: (1) can energy and exergy flow characterization be developed at a future point in time, and (2) can we use the predictive algorithms to extend the energy and exergy flow characterization and derive operational intelligence, used to inform our control based algorithms or provide optimized recommendations to a battlefield commander in real-time. Using our predictive algorithms we confirmed that the future energy and exergy flow characterizations could be generated using the NNs, which was validated through simulation using two separately created datasets, one for training and one for testing. We then used the NNs to implement a model predictive control (MPC) framework to flexibly operate the vehicles thermal coolant loop (TCL), subject to exergy destruction. In this way we could tailor the performance of the vehicle to accommodate a more mission effective solution or a less energy intensive solution. The MPC resulted in a more effective solution when compared to six other simulated conditions, which consumed less exergy than two of the six cases. Our results indicate that we can derive operational intelligence from the predictive algorithms and use it to inform a model predictive control (MPC) framework to reduce wasted energy and exergy destruction subject to the variable operating conditions.
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Більше джерел

Книги з теми "Exergy-based methodology"

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Rosen, Marc Allen *. The development and application of a process analysis methodology and code based on exergy, cost, energy and mass. 1987.

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Частини книг з теми "Exergy-based methodology"

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"Exergy-Based Design Methodology for Airfoil Shape Optimization and Wing Analysis." In Exergy Analysis and Design Optimization for Aerospace Vehicles and Systems, 161–80. Reston ,VA: American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/5.9781600868405.0161.0180.

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Zoughaib, Assaad. "Exergy-based Methodology for Cycle Architecture and Working Fluid Selection: Application to Heat Pumps." In From Pinch Methodology to Energy Integration of Flexible Systems, 91–111. Elsevier, 2017. http://dx.doi.org/10.1016/b978-1-78548-194-9.50003-x.

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De Pra Carvalho, Andriele, and Sieglinde Kindl da Cunha. "Itaipu Technology Park: An Eco-Innovative Niche for Renewable Energies." In Entropy and Exergy in Renewable Energy [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95980.

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Technology parks are considered innovative environments for the development of new technologies, in a dynamic that can be explained by the micro level of multilevel analysis of the theory of sociotechnical transition, by contributing to explain the actors responsible for the process of development and dissemination of technology. The cases analyzed were composed of companies and eco-innovative projects in the renewable energy area of the Itaipu Technological Park. The methodology was based on a study of multiple cases of qualitative nature, supported by content analysis and triangulation of information. The main results showed that the ITP, with the support of its maintainer Itaipu Binacional, created an environment conducive to the development of eco-innovative companies in renewable energies, stimulating the exchange of knowledge between companies and favoring partnerships with national and international companies for technological development.
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Тези доповідей конференцій з теми "Exergy-based methodology"

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Li, Haipeng, and Richard Figliola. "Exergy Based Design Methodology for Airfoil Shape Optimization." In 10th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-4632.

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Monsch, Scott, Haipeng Li, Reggie Harris, Jason Stewart, Richard Figliola, and Jose Camberos. "Exergy Based Design Methodology for Airfoil Shape Optimization and Wing Analysis." In 39th AIAA Thermophysics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-4053.

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Adihou, Yolaine, Malick Kane, Julien Ramousse, and Bernard Souyri. "An exergy-based methodology to determine thermal network's optimal temperature level." In 34th International Conference on Efficiency, Cost, Optimization, Simulation and Environment Impact of Energy Systems. Tokyo, Japan: ECOS 2021 Program Organizers, 2022. http://dx.doi.org/10.52202/062738-0032.

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Figliola, R., and Robert Tipton. "An exergy-based methodology for decision-based design of integrated aircraft thermal systems." In 2000 World Aviation Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2000. http://dx.doi.org/10.2514/6.2000-5527.

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Figliola, R. S., and Robert Tipton. "An Exergy-Based Methodology for Decision-Based Design of Integrated Aircraft Thermal Systems." In World Aviation Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2000. http://dx.doi.org/10.4271/2000-01-5527.

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Khoshgoftar Manesh, Mohammad Hasan, and Majid Amidpour. "New Graphical Methodology for Energy Integration in Nuclear Steam Power Plant." In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48432.

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Анотація:
Exergy concept combined with pinch based approach is used for studying the optimal integration of energy conversion systems. The analysis first considers the representation of the hot and cold composite curves of the process and defines the energy and the exergy requirements. Strength of pinch analysis is that system information can be represented using simple diagrams and thus targets for the system under consideration can be readily obtained prior to design. In contrast, the power of exergy analysis is that it can identify the major causes of thermodynamic imperfection of thermal and chemical processes and thus promising modifications can be determined effectively. By combining the strengths of both methods, the proposed method can represent a whole system, including individual units on one diagram, which helps to screen the promising modifications quickly for improving a base case design. This method is Energy Level Analysis. We have developed energy level analysis to energy destruction level as a strategy for energy integration that uses power plant simulation tools to define the interaction between the various subsystems in the plant and a graphical technique to help the engineer interpret the results of the simulation with physical insights that point towards exploring possible integration schemes to increase energy efficiency. In this paper, 1000 MW nuclear steam power plant similar to Bushehr is considered. Simulation of power plant is performed in STEAM PRO software. Computer code is developed to exergy calculation and generation of exergy destruction level representation. In addition, thermoeconomic analysis is performed to generation of other new graphical representation related to exergy destruction that helps us to consider cost rate of destruction in each component.
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Morosuk, T., and G. Tsatsaronis. "Advanced Exergoeconomic Analysis of a Refrigeration Machine: Part 1—Methodology and First Evaluation." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-62688.

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An exergoeconomic analysis identifies the location, magnitude and sources of thermodynamic inefficiencies and costs in an energy conversion system. This information is used for improving the thermodynamic and the economic performance and for comparing various systems. A conventional exergy-based analysis does not consider the interactions among the components of a system nor the real potential for improving the system. These shortcomings can be addressed and the quality of the conclusions obtained from an exergoeconomic evaluation is improved, when for each important system component the values of exergy destruction and costs are split into endogenous/exogenous and avoidable/unavoidable parts. We call the analyses resulting from such splittings advanced exergy-based analyses. The paper demonstrates how an advanced exergoeconomic analysis provides the user with information on the formation processes of thermodynamic inefficiencies and costs and with suggestions for their minimization. In the first part of the paper, the advanced exergy-based analyses are applied to an air refrigeration machine. In the second part of the paper, we demonstrate that the information obtained in the first part can be used to modify the values of the decision variables to reduce the cost of the final product (cold) of the overall system.
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Lazzaretto, Andrea, and George Tsatsaronis. "On the Quest for Objective Equations in Exergy Costing." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0989.

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Abstract Exergy costing may be performed using different approaches each one being characterized by a different level of subjectivity. The SPECO methodology, a new process-based methodology for exergy costing, is aimed at minimizing the subjectivity associated with the definitions of fuel and product for various components and the auxiliary cost equations. In the SPECO methodology, the auxiliary cost equations are obtained by directly registering the exergy and cost additions and removals along the exergy streams of a thermal system. This paper demonstrates how the “fuel” and “product” rules suggested by this methodology for formulating the cost equations are obtained by depicting the process of cost additions and removals in each exergy stream. The application to a cogeneration system highlights the features of the methodology which is here combined with both the Last In First Out (LIFO) and the Average Costing (AVCO) approaches.
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Robinett, Rush D., and David G. Wilson. "Exergy and Entropy Thermodynamic Concepts for Nonlinear Control Design." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15205.

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This paper develops a novel control system design methodology that uniquely combines: concepts from thermodynamic exergy and entropy; Hamiltonian systems; Lyapunov's direct method and Lyapunov optimal analysis; electric AC power concepts; and power flow analysis. Relationships are derived between exergy/entropy and Lyapunov optimal functions for Hamiltonian systems. The methodology is demonstrated with two fundamental numerical simulation examples: 1) the classic van der Pol nonlinear oscillator system and 2) a Multi-Input-Multi-Output (MIMO) planar 2 Degree-Of-Freedom (DOF) robot that employs PID tracking control. The control system performances and/or appropriately identified terms are partitioned and evaluated based on exergy generation and exergy dissipation terms. Traditionally, almost all modern control design is based on forcing the nonlinear systems to perform and behave like linear systems, thus limiting its maximum potential. These are also known as mainly passive-type control systems. This novel nonlinear control methodology results in both necessary and sufficient conditions for stability of nonlinear systems.
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Tsatsaronis, George, and Tatiana Morosuk. "Advanced Exergoeconomic Evaluation and Its Application to Compression Refrigeration Machines." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41202.

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Анотація:
Splitting the exergy destruction within each component of an energy conversion system into endogenous/exogenous and unavoidable/avoidable parts enhances an exergy analysis and improves the quality of the conclusions obtained from the analysis. The potential for improving each system component is identified and priorities, according to which the design of components should be modified, are established. We call this detailed exergy analysis advanced exergy analysis. For improving the cost effectiveness of an energy conversion system, splitting the investment cost into endogenous/exogenous and unavoidable/avoidable parts is also helpful. The designer should focus on the avoidable thermodynamic inefficiencies (exergy destruction), their costs and the avoidable investment costs. The paper discusses the calculation of these costs in general and the resulting advanced exergoeconomic evaluation that is based on the avoidable endogenous and the avoidable exogenous values for exergy destruction, cost of exergy destruction and investment cost. An application of this methodology to a compression refrigeration machine is presented.
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