Selective water sorbents for multiple applications, 10. Energy storage ability

The application of new selective water sorbents for storage of low temperat ure heat is analyzed. Values of energy storage ability E are measured by a DSC technique for more than fifteen samples of selective water sorbents bas ed on silica gels, aluminas, carbon Sibunit and aerogels as host matrices a nd CaCl2, LiBr, MgCl2 as impregnated salts. E-values up to 8.4 kJ/g and 4.0 kJ/g are found for forced and naturally saturated sorbents, which are much higher than for common sorbents, like zeolites and unimpregnated silica ge ls. The temperature dependence of E gives an estimation of sensible and lat ent heat contributions as well as the average heat of water desorption and average specific heat of dry sorbents. A comparison between the SWSs and ot hers materials proposed in literature is done.