This book is not an academic treatise, but rather a practical guide to easily addressing everyday problems. All calculations are explained using practical examples. The reader will learn how to approach the design of a heat exchanger, how to calculate heat transfer coefficients for convective heating and cooling, the condensation of individual components and mixtures, and evaporation in various devices, as well as how to determine the effective temperature difference for heat transfer. The key influencing factors on heat transfer coefficients and effective temperature differences are presented. It also demonstrates how to calculate the required dew and boiling lines for mixtures. The heat exchange manual is primarily based on the author's professional experiences and insights from numerous discussions.