Heat transfer is the exchange of thermal energy between physical systems. Thermal engineering encompasses mass transfer, fluid mechanisms, heat transfer, and thermodynamics. There has been rapid progress in this field and its applications are finding their way across multiple industries. Solar heating, boiler design, thermal power plants, cooling systems, designing of combustion systems and cooling of computer chips are some of the important applications of these disciplines. This book is compiled in such a manner, that it will provide in-depth knowledge about the theory and practice of heat transfer and thermal engineering. Selected researches that redefine the concepts of this discipline have been presented in this text. With state-of-the-art inputs by acclaimed experts of this field, this book targets students and professionals alike and aims to contribute to the growth of the discipline.