Thermal Economic Optimization And Structural Evaluation For An Advanced Intermediate Heat Exchanger Design
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Thermal Economic Optimization And Structural Evaluation For An Advanced Intermediate Heat Exchanger Design
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Author : Xiaoqin Zhang
language : en
Publisher:
Release Date : 2016
Thermal Economic Optimization And Structural Evaluation For An Advanced Intermediate Heat Exchanger Design written by Xiaoqin Zhang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Coupling the s-CO2 Brayton cycle to the advanced nuclear reactors generally requires an intermediate heat exchanger (IHX). From an economic viewpoint, it is important to reduce the size and cost of IHX, but at the same time, the thermal hydraulic performances should not be deteriorated. Printed-circuit heat exchanger (PCHE), one of advanced compact heat exchangers, has been demonstrated as a competitive candidate. This thesis mainly focuses on designing a PCHE-type advanced IHX with innovative surface geometry with thermal, economic and mechanical consideration. Among the four outstanding surface geometries, zigzag and S-shaped fin channels are selected for a helium-to-s-CO2 IHX. Since the thermal-hydraulic correlations of the zigzag channel with a variety of geometrical parameters are available, a thermal-economic optimization is carried out to optimize the design of zigzag channel. For such multi-objective optimization problem, the annual total cost and heat exchanger thermal effectiveness are selected as two objectives functions. NSGA-II (a fast and elitist non-dominated sorting genetic algorithm), one of the widely used multi-objective genetic algorithms, is used for searching a group of Pareto-optimal designs. It is found that among the Pareto-optimal solutions, the total cost gradually increases with the thermal effectiveness between 88 and 95% while rises rapidly after the heat exchanger effectiveness exceeds around 95%. The sensitivity study shows that for the solutions with thermal effectiveness below around 95% the heat exchanger core physical length is the dominant factor that causes conflict between the total cost and thermal effectiveness. A similar trend can be observed from both the basic and extended design space. The final selection of the optimal designs obtained from the thermal-economic optimization requires a structural evaluation of surface geometry, especially for high-temperature high-pressure applications. S-shaped fin channels are chosen for preliminary structural assessment using numerical simulation due to the geometrical complexity and expected severe stress concentration. It is found that the excessive stress concentrations occur at tips of S-shaped fins when imposed with high-pressure differential loading. A small portion of the fin yields while the rest of the fin body remains low-stress level. The design and service limit prescribed in the ASME BPVC code is used to evaluate local stresses of the S-shaped fin, and according to the criterion, the reference model was allowed for 11.5 years of service with small portion of fin body yielded.
Advances In Thermal Design Of Heat Exchangers
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Author : Eric M. Smith
language : en
Publisher:
Release Date : 2005
Advances In Thermal Design Of Heat Exchangers written by Eric M. Smith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Science categories.
The primary objective in any engineering design process has to be the elimination of uncertainties. In thermal design of heat exchangers there are presently many stages in which assumptions in mathematical solution of the design problem are being made. Accumulation of these assumptions may introduce variations in design. The designer needs to understand where these inaccuracies may arise, and strive to eliminate as many sources of error as possible by choosing design configurations that avoid such problems at source. In this exciting text, the author adopts a numerical approach to the thermal design of heat exchangers, extending the theory of performance evaluation to the point where computer software may be written. The first few chapters are intended to provide a development from undergraduate studies regarding the fundamentals of heat exchanger theory and the concepts of direct sizing. Later chapters on transient response of heat exchangers and on the related single-blow method of obtaining experimental results should also interest the practicing engineer. Theory is explained simply, with the intention that readers can develop their own approach to the solution of particular problems. This book is an indispensable reference text for higher level (post-graduate) students and practicing engineers, researchers and academics in the field of heat exchangers. Includes a whole new chapter on exergy and pressure loss Provides in the first few chapters a development from undergraduate studies regarding the fundamentals of heat exchanger theory, and continues in later chapters to discuss issues such as the transient response of heat exchangers and the related single-blow method of obtaining experimental results that are also of interest to the practicing engineer. Adopts a numerical approach to the thermal design of heat exchangers, extending the theory of performance evaluation to the point where computer software may be written Contributes to the development of the direct ‘sizing’ approach in thermal design of the exchanger surface Explains theory simply, with the objective that the reader can develop their own approach to the solution of particular problems
Energy Research Abstracts
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Author :
language : en
Publisher:
Release Date : 1989
Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Power resources categories.
Nuclear Science Abstracts
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Author :
language : en
Publisher:
Release Date : 1976-04
Nuclear Science Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976-04 with Nuclear energy categories.
Solar Energy Update
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Author :
language : en
Publisher:
Release Date : 1982
Solar Energy Update written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Solar energy categories.
Chemical Abstracts
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Author :
language : en
Publisher:
Release Date : 2002
Chemical Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Chemistry categories.
Erda Energy Research Abstracts
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Author : United States. Energy Research and Development Administration
language : en
Publisher:
Release Date : 1977
Erda Energy Research Abstracts written by United States. Energy Research and Development Administration and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Medicine categories.
Energy A Continuing Bibliography With Indexes
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Author :
language : en
Publisher:
Release Date : 1980
Energy A Continuing Bibliography With Indexes written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Fuel categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1994
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.
Energy
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Author :
language : en
Publisher:
Release Date : 1983
Energy written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Fuel categories.