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ePaper created 2013-09-24, 11:56:35 | version 1.25.20
121 Dipl.-Ing. Mike Blicker Phone +49 711 970-3539 mike.blicker@igb.fraunhofer.de Dipl.-Ing. Siegfried Egner Phone +49 711 970-3654 siegfried.egner@igb.fraunhofer.de Funding We would like to thank the Fraunhofer-Gesellschaft for funding the project “HiPel”, within the scope of its SME-oriented internal research program (MEF). Project partners Fraunhofer IKTS, Dresden | Fraunhofer IWU, Chemnitz regard to their performance in a closed adsorption storage unit. It was shown that size and alternative binders had little effect on the sorption characteristics, such as adsorption ca- pacity and mass-specific heat storage density, in the cylindrical pellets compared to spheres. Measurement of the thermal conductivity of packing In addition, the Fraunhofer IGB has designed and constructed an apparatus for the measurement of the thermal conductivity of packed beds under variable air or gas pressure in the reac- tor. The measuring principle is based on the hot wire method, which enables fast and accurate measurements. Measure- ments are taken in a high vacuum tight container that can be equipped with differently sized sample containers, depending on the quantities of adsorber material. This enables fast refer- ence measurements of the thermal conductivity of sorption pellets under various process conditions. Outlook Once sufficient quantities of coated pellets are available, these will be examined in the adsorption thermal storage unit (standard 5–10 L storage capacity) at the Fraunhofer IGB un- der various operating conditions and the results will be com- pared with the reference data. Investigations of the mechani- cal stability of the pellets are carried out in parallel. It is then possible to determine the application-relevant use of the novel pellets and the increase in performance achieved. In regard to thermal storage, a significant increase in the power density achieved and therefore greatly reduced loading and unloading times are expected. Finally, a cost-benefit calculation for in- dustrial production will be created. 1 Aluminum and copper coated sorption pellets, Fraunhofer IKTS. 2 Experimental set-up for measurement of thermal conductivity of packing in a vacuum. 3 Model thermal storage unit. 4 Sorption pellets made of NaY zeolite in various sizes and shapes. 5 Filling device for metal tubes, Fraunhofer IWU. 4 5 Contacts