This textbook teaches students the principles, materials, and applications they need to understand and analyse heat transfer problems they will encounter in practice. The emphasis on modern practical problems (including thermoelectric cooling), in numerous examples, sets this apart from other titles. This book discusses heat transfer problems (in search of innovative and optimal solutions) and the engineering analysis, to motivate fundamental principles and analytical problem solving methods. By introducing heat flux tracking, students develop intuition about the central role of heat transfer in engineered systems. The energy conversion mechanisms (to and from thermal energy) are integrated into the treatment, thus allowing for realistic design of thermal systems. Microscale heat carriers are also covered. MATLAB software is included, along with other rich materials available on the web site, www.cambridge.org/kaviany. A complete solutions manual for the numerous exercises is available to qualified instructors.