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temperature lift is low. The impregnation of porous hosts with different pore architecture results in different storage properties. Water from microporous aluminophosphates and silicoaluminophosphates can be desorbed almost completely at temperatures <420 K. The storage density is comparable with zeolites and the differential molar heats of adsorption of water are between those of zeolites and impregnated storage materials. The results of the measurements in the lab-scaled storage show that the temperature lift is in between as well. Thus, it can be expected that microporous SAPO’s and AlPO4’s have the potential of zeolite like storage properties, however, with a lower charging temperature and, hence, meet the conditions for solar application. Acknowledgement The supply of the LSX and SAPO samples by Dr. H. Toufar (Tricat GmbH, Bitterfeld, Germany) and the financial support of this work by the Bundesministerium für Wirtschaft und Arbeit (BMWA), grant number 0329525 D, is acknowledged. References Hauer, A., Engelhardt, M. (1999) Stability of Zeolites in Open Cycle Sorpion Processes, in Proceedings of the 1999 International Heat Pump Conference, Munich, Germany, March 24-26, 1999, pp 269-273. Dieng, A.O. and Wang, R.Z. (2001), Literature review on solar adsorption technologies for ice-making and air-conditioning purposes and recent developments in solar technology, Renewable & Sustainable Energy Reviews, Vol. 5, pp. 313-342. Jänchen, J., Peeters, M.P.J., de Haan, J.W., van de Ven, J.M., van Hooff, J.H.C., Girnus, I., Lohse, U. (1993) Adsorption Calorimetric Measurements and 27Al DOR NMR Studies on the Molecular Sieve AlPO-18,.J. Phys. Chem. Vol. 97, pp. 12042-12046. Jänchen, J., Grimm, A., Stach, H. (2000) Physico-chemical studies of porous materials for thermochemical storage of heat, Proceedings of the 5th Workshop IEA, ECESIA Annex 10, April 12-13 2000, Tsu, Mie, Japan, http://www.fskab.com /annex10/workshops. J. Jänchen, D. Ackermann, H. Stach, (2002) Adsorption Properties of Aluminophosphate Molecular Sieves - Potential Applications for Low Temperature Heat Utilization, in R.Z. Wang (Ed), Proceedings of the Int. Sorption Heat Pump Conference, Shanghai, P.R. China, September 24-27, 2002 pp635-638. Meunier, F. (1986) Discussion of thermodynamic analysis of a solar zeolites system, J. Solar Energy Engin. Vol. 108, p. 257. Mittelbach, W., Núnez, T., Luginsland, F., Henning, H-M. (2000) Solid sorption thermal energy storage for solar heating systems, in Brenner, M. and Hahne, E.W.P. (Eds.), Proceedings of the Terrastock 2000 Conference, Stuttgart, Germany, August 28 - September 1, 2000, pp 415-420. Levitskij, E.A., Aristov, Yu.I., Tokarev, M.M. and Parmon, V.N. (1996), Chemical heat accumulators: a new approach to accumulating low potential heat, Solar Energy and Solar Cells 44, 219-235. Lok, B.M., Messina, C.A., Gajek, R.T., Flanigen, E.M. (1984) US Patent No. 4440871. Tchernev, D.I. (2001) Natural zeolites in solar energy, heating, cooling, and energy storage, in: Bish, D.L. and Ming, D.W. (Eds.) Natural Zeolites: Occurance, Properties, Applications, Reviews in Mineralogy & Geochemistry, Vol. 45, pp. 589-617. Wilson, S.T, S., Lok, B.M., Flanigen, E.M., Plains, W. (1982) US Patent No. 4310440. 7th Workshop of IEA/ECES Annex 17, 8-12 October 2004, Beijing, PR of China 7PDF Image | STORAGE OF LOW TEMPERATURE HEAT BY ZEOLITES
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