The discipline of thermal engineering which is concerned with the generation, use, conservation and exchange of thermal energy between physical systems is referred to as heat transfer. The transfer of mass of varying chemical species to achieve heat transfer is also explored under this field. The fundamental modes of heat transfer include advection, conduction, convection and radiation. Advection is the transport mechanism of fluid that depends on its motion and momentum. Conduction is the transfer of energy between objects that are in physical contact. Convection refers to the transfer of energy between an object and its environment due to fluid motion. The transfer of energy by the emission of electromagnetic radiation is known as radiation. This book covers in detail some existent theories and innovative concepts revolving around heat transfer. Those in search of information to further their knowledge will be greatly assisted by it. Coherent flow of topics, student-friendly language and extensive use of examples make this textbook an invaluable source of knowledge.