The contents of this book offer extensive information on specific cases of heat exchangers. The selection was directed by seeking future prospects of applied research and industry, particularly aiming on the effective use and conversion energy in shifting environment. Besides the questions of thermodynamic basics, the contributions of this book are thematically grouped which presents various critical issues grouped under three sections, namely general aspects, micro-channels and compact heat exchangers, and plate heat exchangers. The book is not necessarily focused to be a fundamental source of the knowledge in the area it covers, but rather serves as a mentor while practising expansive solutions of particular technical issues which are faced by engineers and technicians occupied in research and development in the subjects of heat transfer and heat exchangers.