The Experts below are selected from a list of 18171 Experts worldwide ranked by ideXlab platform
Marc A. Rosen - One of the best experts on this subject based on the ideXlab platform.
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comparison of different gas turbine cycles and advanced Exergy Analysis of the most effective
Energy, 2016Co-Authors: M Fallah, S M S Mahmoudi, Mortaza Yari, Akbarpour R Ghiasi, H Siyahi, Marc A. RosenAbstract:Four gas turbine systems are compared: simple gas turbine (SGT), gas turbine with evaporative inlet air cooler (EVGT), steam injection gas turbine (STIG) and steam injection gas turbine with evaporative inlet air cooler (ESTIG). These comparisons are done on the basis of conventional Exergy Analysis and the results show that the ESTIG cycle is the most advantageous for the designer. After determining the ESTIG optimum conditions from maximum net work and maximum second law efficiency perspectives using conventional Exergy Analysis, advanced Exergy Analysis is performed for this system at its optimum conditions to provide detailed information about the improvement potential of the system components. The Analysis is carried out on the basis of the engineering method and the thermodynamic cycle method is used to validate the endogenous Exergy destruction rates of the system components. The results show that the optimization priority order for the system components is different when determined with advanced Exergy Analysis compared to conventional Exergy Analysis.
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Exergy Analysis OF AIRCRAFT FLIGHT SYSTEMS
Exergy, 2013Co-Authors: Ibrahim Dincer, Marc A. RosenAbstract:Exergy Analysis is useful for understanding the efficiencies of aircraft and their engines and can assist in improvement efforts. This chapter provides an understanding of the effects that varying reference environments have on Exergy efficiencies and losses and is helpful in engine design work to provide a more comprehensive assessment of performance, allowing an engine to be better tailored to the types of flights and operating conditions it will encounter. One important aspect is aircraft performance, which plays a vital role in the economic fortunes of airlines and aircraft designers and manufacturers. An Exergy Analysis is presented in this chapter of an aircraft with a turbojet engine over a flight. The application of Exergy to aerospace engines has been somewhat limited. Developing a method of assessing efficiencies and making comparisons that account for this operation is the focus of recent Exergy-based work. This chapter focuses on the second major distinction in the Exergy Analysis of aerospace as opposed to ground-based systems: the variation in the operating environment. Since a fixed reference environment is unrealistic for most aerospace applications, the reference environment can be modeled as the ambient operating environment by allowing it to vary as the operating environment changes. The effect is assessed here of three different reference-environment models on the Exergy efficiencies of a turbojet engine during a flight. Continually varying and constant reference environments are considered. The chapter builds on previous work by focusing on the significantly varying operating environment encountered when applying Exergy Analysis to aerospace engines over a flight.
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Exergy Analysis OF RENEWABLE ENERGY SYSTEMS
Exergy, 2013Co-Authors: Ibrahim Dincer, Marc A. RosenAbstract:Exergy Analysis is usually used to determine Exergy efficiencies and identify and quantify Exergy destructions so that directions for improved efficiency can be determined. This chapter presents Exergy analyses of several renewable energy systems including solar photovoltaic (PV) systems, solar ponds, wind turbines, and geothermal district heating systems and power plants. It describes solar PV systems and their components and discusses the use of Exergy Analysis to assess and improve solar PV systems. Exergy methods provide a physical basis for understanding, refining, and predicting the variations in solar PV behavior. The study also provides and compares energy- and Exergy-based solar PV efficiency definitions. It presents a thermodynamic Analysis of wind energy using energy and Exergy Analysis and the Exergy is formulated of wind energy and its components. Energy and Exergy efficiencies are compared and shown to depend on the area considered. A spatio-temporal mapping approach to wind Exergy Analysis is also provided. Finally, the chapter presents two case studies: energy and Exergy analyses of a geothermal district heating system and Exergy Analysis of a dual-level binary geothermal power plant. These and other renewable energy systems are likely to play increasingly important roles in societies in the future.
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Exergy Analysis of Steam Power Plants
Exergy, 2013Co-Authors: Ibrahim Dincer, Marc A. RosenAbstract:Steam power plants are widely utilized throughout the world for electricity generation, and coal is often used to fuel these plants. Although the world's existing coal reserves will be sufficient for about two centuries, the technology largely used today to produce electricity from coal causes significant negative environmental impacts. Of the Analysis techniques available, Exergy Analysis is perhaps the most important because it is a useful, convenient, and straightforward method for assessing and improving thermal generating stations. The insights gained with Exergy Analysis into plant performance are informative. Exergy-Analysis results can aid efforts to improve the efficiency, and possibly the economic and environmental performance, of thermal generating stations. In this chapter, energy and Exergy analyses are utilized to examine and better understand the performance of steam power plants and to identify and evaluate possible process modifications to improve the plant efficiencies. Some alternative process configurations are then proposed. Exergy is useful for providing a detailed breakdown of the losses, in terms of waste Exergy emissions and irreversibilities, for the overall plants and their components. Some illustrative examples are presented to demonstrate the importance of Exergy in performance improvement of steam power plants. Measures to improve efficiency should be weighed against other factors and implemented only where appropriate.
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Exergy Analysis of Green Energy Systems
Green Energy, 2011Co-Authors: Ibrahim Dincer, Marc A. RosenAbstract:Exergy Analysis is a thermodynamic Analysis technique based primarily on the Second Law of Thermodynamics. As an alternative to energy Analysis, Exergy Analysis provides an illuminating means of assessing and comparing processes and systems rationally and meaningfully. Consequently, Exergy Analysis can assist in improving and optimizing designs. Two key features of Exergy Analysis are (1) it yields efficiencies which provide a true measure of how nearly actual performance approaches the ideal, and (2) it identifies more clearly than energy Analysis the types, causes and locations of thermodynamic losses.
Rahman Saidur - One of the best experts on this subject based on the ideXlab platform.
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A review on Exergy Analysis of industrial sector
Renewable and Sustainable Energy Reviews, 2013Co-Authors: G. Boroumandjazi, Behzad Rismanchi, Rahman SaidurAbstract:Abstract Performance Analysis of industrial sector with high-energy consumption, about 30–70% of total energy use of the countries, is taken into consideration recently. A number of studies have been conducted on energy Analysis of different industries and during the last decades Exergy Analysis applied to offer more realistic suggestions for optimization and improvement of the industrial sector. The present study reviews the existing studies on Exergy Analysis of industrial sector. The irreversibility and losses of industrial processes are also determined. It is concluded that industrial sector has a high potential of improving in order to reduce the energy consumption and emissions.
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Exergy Analysis of solar energy applications
Renewable and Sustainable Energy Reviews, 2012Co-Authors: Rahman Saidur, G. Boroumandjazi, S. Mekhlif, Mohammed JameelAbstract:Solar energy is a clean, abundant and easily available renewable energy. Usage of solar energy in different kinds of systems provides scope for several studies on Exergy Analysis. In the present work, a comprehensive literature review has been carried out on Exergy Analysis of various solar energy systems. The systems considered under study are solar photovoltaic, solar heating devices, solar water desalination system, solar air conditioning and refrigerators, solar drying process and solar power generation. The summary of Exergy Analysis and exergetic efficiencies is presented along with the Exergy destruction sources.
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An Exergy Analysis for cement industries: An overview
Renewable and Sustainable Energy Reviews, 2012Co-Authors: N.a. Madlool, Rahman Saidur, Nasrudin Abd Rahim, M.r. Islam, M.s. HossianAbstract:Abstract Cement production has been one of the most energy intensive industries in the world with energy typically accounting about 30–40% of the production costs. Reduction of the production cost is very much important. Therefore, many studies on the efficient use of energy were carried out in the past. Moreover, these studies, which are based on Exergy Analysis, focus on industrial applications only. This paper reviewed Exergy Analysis, Exergy balance, and exergetic efficiencies for cement industry. It is found that the Exergy efficiency for cement production units ranges from 18% to 49% as well as the Exergy losses due to the irreversibility from kiln are higher than other units in cement production plant.
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A review on Exergy Analysis of biomass based fuels
Renewable and Sustainable Energy Reviews, 2012Co-Authors: Rahman Saidur, G. Boroumandjazi, Saad Mekhilef, Hussein A. MohammedAbstract:Renewable energy sources can be a good substitute of the fossil fuels which are being terminated fast. Nowadays biomass and biofuels are considered because of their environment friendly characteristics and their ability of supplying much more energy. An alternative means to select the most efficient and convenient biomass, is Exergy Analysis. The present paper has reviewed the existent surveys on the Exergy Analysis of different kind of biomass included the woody biomass, herbaceous and agricultural biomass, aquatic biomass, contaminated biomass and industrial biomass. The most common thermochemical processes are investigated and the efficiency of the different process and various kinds of biomass are determined.
Ibrahim Dincer - One of the best experts on this subject based on the ideXlab platform.
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Exergy Analysis OF RENEWABLE ENERGY SYSTEMS
Exergy, 2013Co-Authors: Ibrahim Dincer, Marc A. RosenAbstract:Exergy Analysis is usually used to determine Exergy efficiencies and identify and quantify Exergy destructions so that directions for improved efficiency can be determined. This chapter presents Exergy analyses of several renewable energy systems including solar photovoltaic (PV) systems, solar ponds, wind turbines, and geothermal district heating systems and power plants. It describes solar PV systems and their components and discusses the use of Exergy Analysis to assess and improve solar PV systems. Exergy methods provide a physical basis for understanding, refining, and predicting the variations in solar PV behavior. The study also provides and compares energy- and Exergy-based solar PV efficiency definitions. It presents a thermodynamic Analysis of wind energy using energy and Exergy Analysis and the Exergy is formulated of wind energy and its components. Energy and Exergy efficiencies are compared and shown to depend on the area considered. A spatio-temporal mapping approach to wind Exergy Analysis is also provided. Finally, the chapter presents two case studies: energy and Exergy analyses of a geothermal district heating system and Exergy Analysis of a dual-level binary geothermal power plant. These and other renewable energy systems are likely to play increasingly important roles in societies in the future.
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Exergy Analysis OF AIRCRAFT FLIGHT SYSTEMS
Exergy, 2013Co-Authors: Ibrahim Dincer, Marc A. RosenAbstract:Exergy Analysis is useful for understanding the efficiencies of aircraft and their engines and can assist in improvement efforts. This chapter provides an understanding of the effects that varying reference environments have on Exergy efficiencies and losses and is helpful in engine design work to provide a more comprehensive assessment of performance, allowing an engine to be better tailored to the types of flights and operating conditions it will encounter. One important aspect is aircraft performance, which plays a vital role in the economic fortunes of airlines and aircraft designers and manufacturers. An Exergy Analysis is presented in this chapter of an aircraft with a turbojet engine over a flight. The application of Exergy to aerospace engines has been somewhat limited. Developing a method of assessing efficiencies and making comparisons that account for this operation is the focus of recent Exergy-based work. This chapter focuses on the second major distinction in the Exergy Analysis of aerospace as opposed to ground-based systems: the variation in the operating environment. Since a fixed reference environment is unrealistic for most aerospace applications, the reference environment can be modeled as the ambient operating environment by allowing it to vary as the operating environment changes. The effect is assessed here of three different reference-environment models on the Exergy efficiencies of a turbojet engine during a flight. Continually varying and constant reference environments are considered. The chapter builds on previous work by focusing on the significantly varying operating environment encountered when applying Exergy Analysis to aerospace engines over a flight.
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Exergy Analysis of Steam Power Plants
Exergy, 2013Co-Authors: Ibrahim Dincer, Marc A. RosenAbstract:Steam power plants are widely utilized throughout the world for electricity generation, and coal is often used to fuel these plants. Although the world's existing coal reserves will be sufficient for about two centuries, the technology largely used today to produce electricity from coal causes significant negative environmental impacts. Of the Analysis techniques available, Exergy Analysis is perhaps the most important because it is a useful, convenient, and straightforward method for assessing and improving thermal generating stations. The insights gained with Exergy Analysis into plant performance are informative. Exergy-Analysis results can aid efforts to improve the efficiency, and possibly the economic and environmental performance, of thermal generating stations. In this chapter, energy and Exergy analyses are utilized to examine and better understand the performance of steam power plants and to identify and evaluate possible process modifications to improve the plant efficiencies. Some alternative process configurations are then proposed. Exergy is useful for providing a detailed breakdown of the losses, in terms of waste Exergy emissions and irreversibilities, for the overall plants and their components. Some illustrative examples are presented to demonstrate the importance of Exergy in performance improvement of steam power plants. Measures to improve efficiency should be weighed against other factors and implemented only where appropriate.
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Exergy Analysis of Green Energy Systems
Green Energy, 2011Co-Authors: Ibrahim Dincer, Marc A. RosenAbstract:Exergy Analysis is a thermodynamic Analysis technique based primarily on the Second Law of Thermodynamics. As an alternative to energy Analysis, Exergy Analysis provides an illuminating means of assessing and comparing processes and systems rationally and meaningfully. Consequently, Exergy Analysis can assist in improving and optimizing designs. Two key features of Exergy Analysis are (1) it yields efficiencies which provide a true measure of how nearly actual performance approaches the ideal, and (2) it identifies more clearly than energy Analysis the types, causes and locations of thermodynamic losses.
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Exergy Analysis OF CRYOGENIC SYSTEMS
Environment and Sustainable Development, 2007Co-Authors: Ibrahim Dincer, Marc A. RosenAbstract:The general scope of cryogenic engineering is the design, development, and improvement of low-temperature systems and components. Applications of cryogenic engineering include liquefaction and separation of gases, high-field magnets, and sophisticated electronic devices that use the superconductivity of materials at low temperatures, space simulation, food freezing, medical uses such as cryogenic surgery, and various chemical processes. Cryogenics and low-temperature refrigeration are taking on increasingly significant roles. Exergy Analysis is particularly important for cryogenic applications because the Exergy of a cryogenic substance or fuel becomes increasingly significant as its temperature decreases well below the environment temperature. From applications in the food industry and energy and medical technologies to transportation and the space shuttle, requirements exist for cryogenic liquids to be stored and transferred. Progress in the production of cryogenic temperatures is based to a great extent on advances in thermodynamics. This chapter presents a comprehensive Exergy Analysis of a multistage cascade refrigeration cycle used for natural gas liquefaction as a cryogenic system. The multistage cascade cryogenic system is described and an Exergy Analysis of the cycle components and the minimum work required for liquefaction is provided. Improvements to the Exergy efficiencies of the compressors will reduce the work input for the liquefaction process.
G. Boroumandjazi - One of the best experts on this subject based on the ideXlab platform.
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A review on Exergy Analysis of industrial sector
Renewable and Sustainable Energy Reviews, 2013Co-Authors: G. Boroumandjazi, Behzad Rismanchi, Rahman SaidurAbstract:Abstract Performance Analysis of industrial sector with high-energy consumption, about 30–70% of total energy use of the countries, is taken into consideration recently. A number of studies have been conducted on energy Analysis of different industries and during the last decades Exergy Analysis applied to offer more realistic suggestions for optimization and improvement of the industrial sector. The present study reviews the existing studies on Exergy Analysis of industrial sector. The irreversibility and losses of industrial processes are also determined. It is concluded that industrial sector has a high potential of improving in order to reduce the energy consumption and emissions.
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Exergy Analysis of solar energy applications
Renewable and Sustainable Energy Reviews, 2012Co-Authors: Rahman Saidur, G. Boroumandjazi, S. Mekhlif, Mohammed JameelAbstract:Solar energy is a clean, abundant and easily available renewable energy. Usage of solar energy in different kinds of systems provides scope for several studies on Exergy Analysis. In the present work, a comprehensive literature review has been carried out on Exergy Analysis of various solar energy systems. The systems considered under study are solar photovoltaic, solar heating devices, solar water desalination system, solar air conditioning and refrigerators, solar drying process and solar power generation. The summary of Exergy Analysis and exergetic efficiencies is presented along with the Exergy destruction sources.
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A review on Exergy Analysis of biomass based fuels
Renewable and Sustainable Energy Reviews, 2012Co-Authors: Rahman Saidur, G. Boroumandjazi, Saad Mekhilef, Hussein A. MohammedAbstract:Renewable energy sources can be a good substitute of the fossil fuels which are being terminated fast. Nowadays biomass and biofuels are considered because of their environment friendly characteristics and their ability of supplying much more energy. An alternative means to select the most efficient and convenient biomass, is Exergy Analysis. The present paper has reviewed the existent surveys on the Exergy Analysis of different kind of biomass included the woody biomass, herbaceous and agricultural biomass, aquatic biomass, contaminated biomass and industrial biomass. The most common thermochemical processes are investigated and the efficiency of the different process and various kinds of biomass are determined.
Surendra Kothari - One of the best experts on this subject based on the ideXlab platform.
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A review on energy and Exergy Analysis of solar dying systems
Renewable and Sustainable Energy Reviews, 2012Co-Authors: N. L. Panwar, S.c. Kaushik, Surendra KothariAbstract:Abstract Solar energy is a clean, abundant and freely available renewable energy sources. Energy and Exergy Analysis of solar thermal devices has drawn considerable interest among the researchers across the world. Solar drying is the promising option to utilize low grade energy to dry agricultural produces. Exergy Analysis is a tool to access the efficient usage of solar energy. It is the property of the system, which gives the maximum power that can be distracted from the system when it is brought to a thermodynamic equilibrium state from a reference state. Using Exergy Analysis, based on the first and second laws of thermodynamics, it is possible to infer the true potential of different kinds of energies. In this paper, a holistic approach on energy and Exergy Analysis of solar dryer with case studies has been made.