Abstract
Three kinds of commercial silica gels with pore size of 2–3, 4–7 and 8–10 nm respectively are used for preparing composite adsorbents by soaking them into the aqueous solution of calcium chloride. The test result indicates that both the water uptake and adsorption rate of composite adsorbents prepared from 4–7 and 8–10 nm silica gels improve greatly compared to pure silica gels, but they do not for 2–3 nm silica gels. The silica gel with pore size of 2–3 nm is not suitable for preparing the composite adsorbent by impregnation method due to the pore blockage because of the small pore size. The SCP and COP of the adsorption chiller with sample SA50 are 128.3 Wkg−1 and 0.27 respectively at the hot source temperature of 90 °C, which are largely superior to that of SA0. Hence using the composite adsorbent instead of the pure silica gel can reduce the size of the adsorption chiller.
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References
Aristov, Y.I.: Novel materials for adsorptive heat pumping and storage: screening and nanotailoring of sorption properties (review). J. Chem. Engn. Japan. 40, 1241–1251 (2007a)
Aristov, Y.I.: New family of materials for adsorption cooling: material scientist approach. J. Eng. Thermophys. 16, 63–72 (2007b)
Aristov, Y.I., Restuccia, G., Cacciola, G., Parmon, V.N.: A family of new working materials for solid sorption air conditioning systems. Appl. Therm. Eng. 22, 191–204 (2002)
Chen, C.J., Wang, R.Z., Xia, Z.Z., Kiplagat, J.K., Lu, Z.S.: Study on a compact silica gel–water adsorption chiller without vacuum valves: design and experimental study. Appl. Energy 87, 2673–2681 (2010)
Daou, K., Wang, R.Z., Xia, Z.Z.: Development of a new synthesized adsorbent for refrigeration and air conditioning applications. Appl. Therm. Eng. 26, 56–65 (2006)
Daou, K., Wang, R.Z., Yang, G.Z., Xia, Z.Z.: Theoretical comparison of the refrigerating performances of a CaCl2 impregnated composite adsorbent to those of the host silica gel. Int. J. Therm. Sci. 47, 68–75 (2008)
Dawoud, B., Aristov, Y.I.: Experimental study on the kinetics of water vapor sorption on selective water sorbents, silica gel and alumina under typical operating conditions of sorption heat pumps. Int. J. Heat Mass Transf. 46, 273–281 (2003)
Glaznev, I., Ponomarenko, I., Kirik, S., Aristov, Y.I.: Composites CaCl2/SBA-15 for adsorptive transformation of low temperature heat: pore size effect. Int. J. Refrigeration 34, 1244–1250 (2011)
Gong, L.X., Wang, R.Z., Xia, Z.Z., Chen, C.J.: Adsorption equilibrium of water on a composite adsorbent employing lithium chloride in silica gel. J. Chem. Eng. Data 55, 2920–2923 (2010)
Gordeeva, L.G., Restuccia, G., Freni, A., Aristov, Y.I.: Water sorption on composites “LiBr in a porous carbon”. Fuel Process. Technol. 79, 225–231 (2002)
Gordeeva, L.G., Savchenko, E.V., Glaznev, I.S., Malakhov, V.V., Aristov, Y.I.: Impact of phase composition on water adsorption on inorganic hybrides salt/silica. J. Colloid Interface Sci. 301, 685–691 (2006)
Ji, J.G., Wang, R.Z., Li, L.X.: New composite adsorbent for solar-driven fresh water production from the atmosphere. Desalination 212, 176–182 (2007)
Liu, Y.F., Wang, R.Z.: Pore structure of new composite adsorbent SiO2. xH2O. yCaCl2 with high uptake of water from air. Sci. China Ser. E. 46, 551–559 (2003)
Maggio, G., Gordeeva, L.G., Freni, A., Aristov, Y.I., Santori, G., Polonara, F., Restuccia, G.: Simulation of a solid sorption ice-maker based on the novel composite sorbent “lithium chloride in silica gel pores”. Appl. Therm. Eng. 29, 1714–1720 (2009)
Saha, B.B., Chakraborty, A., Koyama, S., Aristov, Y.I.: A new generation cooling device employing CaCl2-in-silica gel–water system. Int. J. Heat Mass Transf. 52, 516–524 (2009)
Simonova, I.A., Aristov, Y.I.: Sorption properties of calcium nitrate dispersed in silica gel: the effect of pore size. Russ. J. Phys. Chem. 79, 1307–1311 (2006)
Tokarev, M., Gordeeva, L., Romannikov, V., Glaznev, I., Aristov, Y.I.: New composite sorbent CaCl2 in mesopores for sorption cooling/heating. Int. J. Therm. Sci. 41, 470–474 (2002)
Zhang, X.J., Qiu, L.M.: Moisture transport and adsorption on silica gel–calcium chloride composite adsorbents. Energ. Convers. Manag. 48, 320–326 (2007)
Zhang, X.J., Sumathy, K., Dai, Y.J., Wang, R.Z.: Parametric study on the silica gel–calcium chloride composite desiccant rotary wheel employing fractal BET adsorption isotherm. Int. J. Energy Res. 29, 37–51 (2005)
Zhu, D.S., Wu, H.J., Wang, S.W.: Experimental study on composite silica gel supported CaCl2 sorbent for low grade heat storage. Int. J. Therm. Sci. 45, 804–813 (2006)
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The research work has been financially supported by a grant from the Innovation Program of Chinese Academy of Sciences (Grant No. 0907r7 and 0907z1), and a grant of the foreign experts bureau of Guangdong.
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Bu, X., Wang, L. & Huang, Y. Effect of pore size on the performance of composite adsorbent. Adsorption 19, 929–935 (2013). https://doi.org/10.1007/s10450-013-9513-8
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DOI: https://doi.org/10.1007/s10450-013-9513-8