Thermal engineering is a sub-discipline of mechanical engineering that focuses on the movement and transfer of heat energy. The energy is transformed between two mediums. It can also be transferred into other forms of energy. Thermal engineering makes use of thermodynamics, which is a branch of physics that deals with heat and temperature. It involves the process of converting the generated energy from thermal sources into mechanical, chemical and electrical energy. Thermofluids is an associated field of thermal engineering. It draws on concepts from thermodynamics as well as thermal engineering. This book presents the complex subject of thermal engineering in the most comprehensible and easy to understand language. It explores all the important aspects of thermal engineering in the present day scenario. This book is appropriate for students seeking detailed information in this area as well as for experts.