This book offers valuable 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. Beside the questions of thermodynamic basics, the book also presents various critical topics, such as operations, conceptions, design, fouling and cleaning of heat exchangers. It also addresses utilization and storage of thermal energy and geothermal energy, directly or by function of heat pumps. The contributions of this material are thematically grouped for the content of each topic, which is introduced by summarising the key objectives of the encompassed chapters. The book is not necessarily focused to be a fundamental source of 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.