Investigation on the isotherm of silica gel+water systems: TG and volumetric methods

Xiaolin Wang, W. Zimmerman, K.C. Ng, A. Chakraboty, J.U. Keller

    Research output: Contribution to journalArticle

    Abstract

    Abstract This article presents results of the experimental investigation on the adsorption of the water vapor on silica gel. Two independent experimental methods has been used, viz. the constant-volume-variable-pressure (CVVP) system and variable pressure thermogravimetry (TG). Results from these two methods are compared with each other. Also the isosteric heat of adsorption of this system has been determined from the equilibrium data. The silica gels investigated here are Fuji Davison type 'A' and type 'RD'. Adsorption isotherm of water vapor have been measured under a variety of conditions all referring to chiller operation cycles, i.e. temperatures from 303 to 358 K and pressures from 500 to 7000 Pa. The data collected from the two independent experiments compare very favorably with each other and their trends are consistent with those of the adsorption chiller manufacturer. This lends significant weight to our experimental data on silica gel+water systems as being valuable to the adsorption chiller manufacturers and the scientific community.
    Original languageEnglish
    Pages (from-to)659-669
    JournalJournal of Thermal Analysis and Calorimetry
    Volume76
    Issue number2
    Publication statusPublished - 2004

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