Sorption Energy Storage and Conversion for Cooling and Heating (image) Fraunhofer-Gesellschaft Share Print E-Mail Caption Zeolites are crystalline minerals with a porous structure that adsorbs other substances. When the material comes into contact with water vapor, it binds the steam within its pores, releasing heat in the process. Credit © Fraunhofer IGB Usage Restrictions The picture may be used for editorial purposes only. It is protected by copyright. The use is free of charge if the reference is mentioned. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.