Heat storage system for industrial application

kick off meeting in Berlin
Heat storage system for industrial application

On November 15th the kick-off meeting of the R&D project “Heat Saver Demo” took place in Berlin, a project funded by FP7, the EU’s 7th framework programme for research and technological development. The project partners come from Germany (B&O Gebäudetechnik GmbH, ZeoSys Zeolite Systems, Fraunhofer Institute for Interfacial Engineering and Biotechnology), Estonia (Dvigatel Regital) and Austria (Energy Changes).

Research topic is the so called “Heat Saver”, a compact system offering the advantages of lossless and longterm heat storage based on adsorption. The project goals are to demonstrate and to optimise the Heat Saver in industrial applications, for instance, the system will be installed in a CHP plant. The project team will investigate the energy efficiency, the energy and carbondioxide balances as well as the economic viability of different relevant use cases. Besides, the production process of the storage system will be industrialised and optimised in order to be able to get Heat Saver to market in near future.

Functional principle of Heat Saver: Heat is stored thermo-chemically in a mineral storage medium (zeolite). The heat can be extracted from the heat storage system by letting water vapor flow through the storage medium. The water molecules adsorb on the surface of the zeolite, which is an exothermic process setting free heat. The other way around heat can be stored in Heat Saver by evaporation of the water molecules adsorbed on the surface of the zeolite. Thus, heat can be stored losslessly for long periods of time as long as no water vapor (humid air) gets into the system. Another advantage is the higher heat storage density of zeolite material compared to water. Therefore zeolite storage systems can be realised in much smaller containers, offering even the opportunity to transport stored heat.