To capitalize on the full potential of MOFs, it is important not only for water vapor to have easy access to the inner surfaces and pore space of the material but also for heat transfer away from the material to be effective. To aid the process, experts at Fraunhofer ISE have developed a new coating technique, for which they applied for a patent. This technique allows the new sorbents to be applied to equipment such as heat exchangers without obstructing heat and mass transfer. The research is being funded by the German Federal Ministry for Economic Affairs and Energy.
Heat from storage
Industrial facilities, power stations and biogas plants all make use of processes in which heat is essentially a waste product. Currently, hardly any of this heat energy is put to use something that scientists at the Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB in Stuttgart want to change. The researchers are working on developing and optimizing zeolite thermal storage systems.
Zeolites are crystalline minerals with a porous structure that adsorbs other substances such as water. Their internal surface area can be as much as 1000 square meters per gram. When the zeolite comes into contact with water vapor, it binds water molecules within its pores, releasing heat in the process. Drying out the material is a way to store heat; the energy this takes is released as heat as soon as water vapor is again adsorbed. Experts from Fraunhofer IGB are now developing technology to allow this heat storage technique to be used.
Thermochemical heat storage systems based on a combination of zeolites and water have the potential to amass up to 180 kilowatt hours of energy per cubic meter depending on the charging temperature and the application. To put this into perspective, traditional hot water energy storage systems norma
|Contact: Simone Ringelstein|