This course provides a dynamic exploration into the principles governing the transfer of thermal energy in diverse systems. It is designed to equip participants with an in-depth understanding of thermodynamics and its practical applications. By the course's conclusion, participants will have acquired a holistic comprehension of thermodynamic principles, including the definition and relevance of different power plant systems, the exploration of crucial properties influencing energy systems, and the investigation of conservation principles for both closed and open systems. With a focus on work transfer, heat transfer, and the conceptual foundations of the second law of thermodynamics, participants will establish benchmarks for thermodynamic performance, allowing them to set standards for energy systems and processes. This course caters to engineers, technicians, energy professionals, students, system designers, power plant operators, industry professionals in refrigeration and heat pumps, individuals involved in internal combustion engines, as well as energy analysts and planners. Throughout the course, participants will not only gain theoretical insights but also apply their knowledge to solve real-world problems, offering a practical and comprehensive approach to mastering the complexities of thermodynamics. Join us on this educational journey as we delve into the intricacies of energy transfer, from defining systems to exploring advanced performance methods and analysing internal combustion engine mechanics.