Termodinamica yunus cengel

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  • Publicado : 22 de marzo de 2011
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PREFACE
BACKGROUND
Thermodynamics is an exciting and fascinating subject that deals with energy, which is essential for sustenance of life, and thermodynamics has long been an essential part of engineering curricula all over the world. It has a broad application area ranging from microscopic organisms to common household appliances, transportation vehicles, power generation systems, and evenphilosophy. This introductory book contains sufficient material for two sequential courses in thermodynamics. Students are assumed to have an adequate background in calculus and physics.

OBJECTIVES
This book is intended for use as a textbook by undergraduate engineering students in their sophomore or junior year, and as a reference book for practicing engineers. The objectives of this text are •To cover the basic principles of thermodynamics. • To present a wealth of real-world engineering examples to give students a feel for how thermodynamics is applied in engineering practice. • To develop an intuitive understanding of thermodynamics by emphasizing the physics and physical arguments. It is our hope that this book, through its careful explanations of concepts and its use of numerouspractical examples and figures, helps students develop the necessary skills to bridge the gap between knowledge and the confidence to properly apply knowledge.

PHILOSOPHY AND GOAL
The philosophy that contributed to the overwhelming popularity of the prior editions of this book has remained unchanged in this edition. Namely, our goal has been to offer an engineering textbook that • Communicatesdirectly to the minds of tomorrow’s engineers in a simple yet precise manner. • Leads students toward a clear understanding and firm grasp of the basic principles of thermodynamics. • Encourages creative thinking and development of a deeper understanding and intuitive feel for thermodynamics. • Is read by students with interest and enthusiasm rather than being used as an aid to solve problems.|

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Preface
Special effort has been made to appeal to students’ natural curiosity and to help them explore the various facets of the exciting subject area of thermodynamics. The enthusiastic responses we have received from users of prior editions—from small colleges to large universities all over the world— indicate that our objectives have largely been achieved. It is ourphilosophy that the best way to learn is by practice. Therefore, special effort is made throughout the book to reinforce material that was presented earlier. Yesterday’s engineer spent a major portion of his or her time substituting values into the formulas and obtaining numerical results. However, formula manipulations and number crunching are now being left mainly to computers. Tomorrow’sengineer will need a clear understanding and a firm grasp of the basic principles so that he or she can understand even the most complex problems, formulate them, and interpret the results. A conscious effort is made to emphasize these basic principles while also providing students with a perspective of how computational tools are used in engineering practice. The traditional classical, or macroscopic,approach is used throughout the text, with microscopic arguments serving in a supporting role as appropriate. This approach is more in line with students’ intuition and makes learning the subject matter much easier.

NEW IN THIS EDITION
All the popular features of the previous editions are retained while new ones are added. With the exception of reorganizing the first law coverage and updatingthe steam and refrigerant properties, the main body of the text remains largely unchanged. The most significant changes in this fifth edition are highlighted below.

EARLY INTRODUCTION OF THE FIRST LAW OF THERMODYNAMICS
The first law of thermodynamics is now introduced early in the new Chapter 2, “Energy, Energy Transfer, and General Energy Analysis.” This introductory chapter sets the...
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