This book offers an analytical review of thermodynamic processes through EES (Engineering Equation Solver). The aim is to facilitate the study of the principles of thermodynamics, in a gradual and progressive manner. As the resolution of certain problems calls for a numerical solution, EES software simplifies the calculation procedure. The book is organized into 6 chapters. The first chapter is a review of the basic thermodynamic concepts, laws and equations. The second deals with steam/vapour cycles and the third with gas cycles. The fourth chapter concerns exergetic (or second law) analysis of different processes and cycles. The fifth chapter deals with psychrometrics and moist air. The sixth and final chapter presents applications related to refrigeration technology. Throughout the second to the sixth chapter, several examples are shown, solved with EES and commented.