This textbook comprehensively covers fundamentals and advanced concepts of thermodynamics in a single volume. It provides detailed discussion of advanced concepts including energy efficiency, energy sustainability, energy security, organic Rankine cycle (ORC), combined cycle power plant (CCPP), combined cycle power plant integrated with organic Rankine cycle and absorption refrigeration system, integrated coal gasification combined cycle (IGCC) power plants, energy conservation in domestic refrigerators and next generation Low-GWP (Global Warming Potential) refrigerants. Pedagogical features including solved problems and unsolved exercises are interspersed throughout the text for better understanding. The textbook is primarily written for senior undergraduate and graduate students in the field of mechanical engineering, civil engineering and aerospace engineering for courses on engineering thermodynamics/thermodynamics. The textbook will be accompanied by teaching resource including solution manual for the instructors. This book: Provides design and experimental problems for better understanding. Discusses comprehensively power cycles and refrigeration cycles and their advancements. Explores design of energy efficient buildings to reduce the energy consumption.