Thermochemical Energy Storage

Abstract

Thermochemical Energy StorageA loss-free, thermal energy storage technology attracts a rising interest over the past years. The thermochemical energy storage is seen as a promising technology for a loss-free thermal energy store with high storage density. This paper presents the state of the art in the field of material research, process design and process development as well as the technological challenges of the thermochemical energy storage. Exemplarily two system concepts, one for low temperature applications and one for high temperature applications, are shown to demonstrate the technical capabilities of the thermochemical energy storage.

Thermodynamic analysis of chemical heat pumps

“…The variety of different reaction types like dehydration of salt hydrates, dehydrogenation of metal hydrides, dehydration of metal hydroxides or decarboxylation of metal carbonates [1] enables a wide range of temperatures and applications.…”

“…In this kind of thermochemical storage system, the enthalpy of reaction D R h is stored as chemical energy in the products of the reaction [1] and determines the order of magnitude of storage density. Based on thermodynamic considerations, the temperature of chemical equilibrium, often called turning temperature T * , and enthalpy of reaction D R h are linked by changes in entropy D R s between reactants and products [2].…”

A Thermochemical Long‐Term Heat Storage System Based on a Salt/Zeolite Composite

“…In the past years, different concepts for thermochemical heat storage were developed 40. For temperatures below 100 °C, these are predominantly adsorption‐based systems.…”

“…Open thermochemical heat storage systems are developed in various European and national research projects 32, 43–45. Significant contributions were made by the projects MonoSorp 46 und CWS 40. The project CWS, funded by the German Federal Ministry of Economic Affairs and Energy, is the starting point for the work presented here.…”

Process and Reactor Design for Thermo-Chemical Energy Stores

“…A detailed overview of the experimental setup and results are given e.g. in (Kerskes et al, 2011a) and (Bertsch et al, 2010).…”