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THERMOCHEMICAL STORAGE OF LOW TEMPERATURE HEAT BY ZEOLITES; SAPO’S AND IMPREGNATED ACTIVE CARBON J. Jänchena, b, D. Ackermannb, E. Weilerb, H. Stachb and W. Brösickea a Fachhochschule für Technik und Wirtschaft Berlin (University of Applied Sciences Berlin), Fachbereich 1, Ingenieurwissenschaften I, Treskowallee 8, D-10318 Berlin, GERMANY b ZeoSys GmbH, Volmerstraße 13, D-12489 Berlin-Adlershof, GERMANY Abstract The adsorption behaviour and storage properties of common and new microporous materials such as low silica X zeolites (LSX), SAPO and with CaCl2 impregnated active carbon were investigated by means of TG/DSC, the measurements of adsorption isotherms and using a lab-scaled storages of 1.5 L volume. Tests of common zeolites and mesoporous materials (silica gel) in a lab-scaled storages showed that application of low temperature heat or solar heat for charging of those storage materials require new microporous materials which do not need a high charging temperature but have still a certain energy density and temperature lift. The present results show that special microporous silicoaluminophosphates and an impregnated active carbon are candidates for those applications with storage properties between the zeolites and the mesoporous materials. Introduction Increasing interest in the application of the thermochemical storage or adsorption heat pumps for utilization of industrial waste heat and solar heat stimulated several experimental and theoretical studies on short and long term heat storage (Tchernev, 2001, Mittelbach et al., 2000, Hauer et al.,1999) as well as heat driven heat pumps (Meunier,, 1986, Dieng, and Wang, 2001). However, less attention was paid to the properties of the porous materials such as common zeolites, silica gels or aluminosilicates which are mainly designed for catalysis and adsorption technologies but are not optimized for thermochemical heat storage applications. In recent years some new storage materials were suggested and characterized such as the so called composite adsorbens (Levitskij et al., 1996, Jänchen et al., 2000) which have considerable high storage densities, a low charging temperature but their temperature lift is limited. Very recently (Jänchen, et al., 2002) we suggested the introduction of the AlPO4’s for heat storage and heat transformation purposes. AlPO4’s are zeolites-like microporous materials, which are mildly hydrophilic and may have the potential to close the gap between silica gels and zeolites in respect to the optimization of the adsorption strength of the water and the ability to be desorbed at mild conditions. Those microporous aluminophosphates can be modified by incorporation of some silicon into the lattice to tailor their adsorption properties with respect to the water adsorption/desorption properties. Furthermore, we included into our studies microporous activated carbons beside meso- and macroporous supports as hosts for the hygroscopic salt hydrates (CaCl2) to get informations about the influence of the pore size on the hydratation/dehydratation properties of the salt. The aim of this paper is, therefore, to give a progress report (since the 3rd workshop of the Annex 17 in Tokyo) about the results of the characterization of those new thermochemical storage systems. Both a special microporous silicoaluminophosphate and an impregnated activated carbon were subject of our extended investigations. 7th Workshop of IEA/ECES Annex 17, 8-12 October 2004, Beijing, PR of China 1PDF Image | STORAGE OF LOW TEMPERATURE HEAT BY ZEOLITES
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