This textbook provides a strong foundation in the basic thermodynamics needed to analyze realworld engineering applications of thermodynamics in the field of energy systems. Written in a format readable to students new to the subject this book will also help entrepreneurs venturing into the world of energy and power without a background in mechanical engineering.This book presents the basic theories of thermodynamics by focusing on the application of the subject matter to the most common applications of thermodynamics. It takes realworld problems from the authors over 40 years of experience as a practical professional engineer and provides indepth solutions to each problem using concepts the student has learned from earlier chapters.