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maximum temperature in the storage in discharging mode is lower as well. As it is known those mesoporous materials are suitable for application of solar heat (Mittelbach et al. 2000) but with a limited temperature lift. However, Figure 6 shows that those limits are less pronounced for the SAPO. The temperature profile of the latter is between the zeolites and the mesoporous materials. Next to the SAPO follows the impregnated active carbon followed by the silica gel at the lowest temperature. The flat course of the temperature profile of the SAPO from the beginning at a medium temperature in the storage is in accordance with the thermodynamic behaviour discussed above. Table2 Desorption temperatures, adsorbed amounts of adsorbed water, energy densities and maximum temperature in the storage for zeolites, SAPO, pure silica gel and impregnated materials Material Desorption (Ad)sorbed amount temperature in K water in kg/kg LiLSX 473 0.24 NaLSX 473 0.23 Energy density in Wh/kg 225 185 154 161 177 123 Figure 6 LiLSX, NaLSX, SAPO, active carbon/CaCl2 and pure silica gel (from top to bottom). Conclusions It was shown that zeolites of different types show a higher temperature lift during discharging of a thermochemical storage. However, the charging temperature of those materials exceed 473 K which is practically not easy to achieve by common solar collectors. Silica gel or impregnated mesoporous materials show a high storage density and need a lower charging temperature, about 393 K, but the 7th Workshop of IEA/ECES Annex 17, 8-12 October 2004, Beijing, PR of China SAPO Active carb./CaCl2 Attapulgite/CaCl2 Silica gel 373, 423 393 393 393 0.23 0.223 0.18 0.18 Max. temperature in the storage in K 380 370 345 350 336 335 Temperature profiles of different storage materials inside the storage vs. time: 6PDF Image | STORAGE OF LOW TEMPERATURE HEAT BY ZEOLITES
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