Thermal engineering refers to a sub-discipline of mechanical engineering concerned with the transmission and movement of heat energy. This energy can be converted into different types of energy. Thermal engineering is used in a variety of industries including the construction industry, heating ventilation and cooling industry, and automotive industry. Concepts related to mass transfer, heat transfer, thermodynamics and fluid mechanics may be used to solve thermal engineering problems. There are various applications of thermal engineering including process fired heaters, thermal power plants, combustion engines, compressed air systems, thermal insulation, boiler design, refrigeration systems, and heat exchangers. This book outlines the concepts and applications of thermal engineering in detail. It is a valuable compilation of topics, ranging from the basic to the most complex advancements in this field. This book will serve as a reference to a broad spectrum of readers.