Heat and Cold Storage 2 focuses on thermochemical sorption storage processes - that is, absorption, adsorption and chemical sorption. This book first analyzes the principles of sorption and defines the criteria for selecting the materials to be used, before presenting the three sorption storage technologies. It details the functioning of the absorption cycle in order to highlight the future challenges of this method. Next, the book examines storage by physical adsorption. Then, it presents the fundamentals of this phenomenon and a description of solid-gas adsorption cycles and systems, followed by a number of examples of prototype installations. Finally, the book describes the phenomenon of heat storage by chemical sorption from the scale of the reactive material to the scale of the process, before putting the state of the art of possible improvements into perspective and illustrating various applications.