This book deals with exergy and its applications to various energy systems and applications as a potential tool for design, analysis and optimization, and its role in minimizing and/or eliminating environmental impacts and providing sustainable development. In this regard, several key topics ranging from the basics of the thermodynamic concepts to advanced exergy analysis techniques in a wide range of applications are covered as outlined in the contents. It provides comprehensive coverage of exergy and its applications. It connects exergy with three essential areas in terms of energy, environment and sustainable development. It presents the most up-to-date information in the area with recent developments. It provides a number of illustrative examples, practical applications, and case studies. It features an easy to follow style, starting from the basics to the advanced systems.