Thermal design and optimization

Energy Voi. 21, No. 5, pp. 433.--434, 1996

Pergamon

S0360-5442(96)00012-6

Copyright © 1996 Elsevier Science Ltd Printed in Great Britain. All rights reaerved 0360-5442196 $15.00+0.00

BOOK REVIEW A. Bejan, G. Tsatsaronis, and M. Moran, Thermal Design and Optimization, Wiley Interscience, John Wiley Sons Inc., New York (1996). reviewed by K. Seshadri Center for Energy and Combustion Research, Department of Applied Mechanics and Engineering Sciences, University of California San Diego, La Jolla, California 92093-0411 (Received 28 December 1995) The book by A. Bejan, G. Tsatsaronis and M. Moran provides a comprehensive and rigorous introduction to thermal system design. Thermal systems are defined as systems that experience significant work with thermal interactions. Thermal interactions include heat transfer and/or the flow of hot or cold streams of matter. Thermal system design is presumed to have two branches: system design and component design. The first refers to overall thermal systems and the second to individual components such as compressors, turbines, reactors, etc. that make up the overall system. Unlike traditional books which deal with component and design analysis, this book emphasizes system-oriented design. The presentation is based on the assumption that the reader has introduclory knowledge of engineering thermodynamics, heat transfer, and fluid mechanics. Some background in engineering economics is also desirable. For completeness of exposition, reviews of these topics are provided in Chapters 2, 4 and 7. The authors make a concerted effort to include material drawn from the best of contemporary thinking about design and design methodology. Thc book includes current developments in engineering thermodynamics and heat transfer. A major topic addressed throughout the text is the use of exergy analysis for optimization of system design. The book shows that design requires synthesis: selecting and putting together components to form a smoothly and efficiently working whole. To illustrate that design requires principles from different disciplines applied to a single problem, a case study is considered throughout the book. This case study is the design of a cogeneration system. Chapter 1 provides a summary of the distinct stages of thermal system design. Chapter 3 provides a discussion of design guidelines evolving from reasoning using the second law of thermodynamics and, in particular, the exergy concept. In Chapter 4, applications of design 433

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principles to heat transfer are described. The presentation continues with discussion.~ ~1' applications of design principles with heat transfer and fluid flows. In Chapter 6, applications with thermodynamics, heat transfer and fluid mechanics are developed. The presentations clearly illuminate design principles by introducing notions such as degrees of freedom, design constraints, and thermodynamic optimization. Chapter 8 is a presentation of the powerful principles of "thermoeconomics", which is defined as the branch of engineering that combines exergy analysis and economic principles for design and operation of a cost-effective system. Exergy-costing methods are imroduced and applied in this chapter. These methods identify the real cost sources at the component level. The presentation in the book is appropriate for engineering students at the senior level. The book is suitable for use as the primary text in an elective course. This is one of the best new sources currently available for meeting the recommendations of the U. S. Accreditation Board for Engineering and Technology for more design emphasis in engineering curricula. The book is generally suitable for use as a reference text in courses on thermodynamics, fluid mechanics and heat transfer. Theoretical Design and Optimization represents a milestone in engineering education through synthesis of the many disciplines that must be mastered in order to accomplish a scientifically and economically optimal system design. The authors richly deserve a commendation for an outstanding original contribution to engineering education.