Thermal engineering is an intricate subject, which includes elements from various fields like fluid mechanics, thermodynamics, mass transfer and heat transfer. It is the study of heating and cooling processes, equipment, and theories used in mechanical and chemical engineering. This book presents the complex subject of thermal engineering in the most comprehensible and easy to understand language. Most of the topics introduced in it cover new techniques and the methods of thermal engineering. As this field is emerging at a rapid pace, the contents of this textbook will help the readers understand the modern concepts and applications of the subject.