Study of thermal conductivity, permeability, and adsorption performance of consolidated composite activated carbon adsorbent for refrigeration
Wang, L. W., Tamainot-Telto, Zacharie, Thorpe, Roger, Critoph, Robert E., Metcalf, Steven John and Wang, R. Z.. (2011) Study of thermal conductivity, permeability, and adsorption performance of consolidated composite activated carbon adsorbent for refrigeration. Renewable Energy, Volume 36 (Number 8). pp. 2062-2066. ISSN 0960-1481Full text not available from this repository.
Official URL: http://dx.doi.org/10.1016/j.renene.2011.01.005
Composite adsorbents, comprising activated carbon and expanded natural graphite, have been developed, and their thermal conductivity, permeability and adsorption performance were tested. The thermal conductivity varied with the ratio of activated carbon to expanded natural graphite. Thermal conductivity increased as the ratio of expanded graphite increased. Considering that the density of activated carbon for the composite adsorbent should not be lower than 200 kg/m(3), otherwise the volumetric cooling capacity would be unacceptably low, the highest thermal conductivity obtained from experiments was 2.47 W m(-1) K(-1). The permeability was also measured, and the best result obtained was 4.378 x 10(-12) m(2). In order to evaluate the influence of heat and mass transfer on adsorption performance, the adsorption rate was tested using a Rubotherm magnetic suspension balance, and results showed that for the freezing conditions lower than -10 degrees C the performance of granular activated carbon was better than that of solidified adsorbent because of the reduced mass transfer of ammonia at low saturated pressure. The adsorption performance of consolidated adsorbents increased rapidly when the evaporating temperature was higher than -10 degrees C. When the evaporating temperature was 8 degrees C, the adsorption rate of consolidated adsorbent was improved by 29% if compared with that of granular adsorbent. (C) 2011 Elsevier Ltd. All rights reserved.
|Item Type:||Journal Article|
|Subjects:||T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TP Chemical technology
|Divisions:||Faculty of Science > Engineering|
|Library of Congress Subject Headings (LCSH):||Refrigeration and refrigerating machinery -- Research, Carbon, Activated -- Thermal conductivity, Carbon, Activated -- Absorption and adsorption, Carbon composites -- Thermal conductivity, Carbon composites -- Absorption and adsorption|
|Journal or Publication Title:||Renewable Energy|
|Page Range:||pp. 2062-2066|
|Funder:||Engineering and Physical Sciences Research Council (EPSRC), Royal Society (Great Britain), Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC), China. National Education Committee|
|Grant number:||50806043 (NSFC)|
|Version or Related Resource:||An earlier version of this item was presented at the Heat Powered Cycles Conference 2009, Berlin, Germany, Sep 7 - 9, 2009.|
|References:|| Wang RZ, Oliveira RG. Adsorption refrigerationdAn efficient way to make good use of waste heat and solar energy. Progress in Energy and Combustion Science 2006;32(4):424e58.  Neveu P, Castaing J. Solid-gas chemical heat pumps:field of application and performance of the internal heat of reaction recovery process. Heat Recovery Systems 1993;13(3):233e51.  Iloeje OC, Ndili AN, Enibe SO. Computer simulation of a CaCl2 solid-adsorption solar refrigerator. Energy 1995;20(11):1141e51.  Critoph RE. Carboneammonia systems-previous experience, current projects and challenges for the future. In: Proceedings of the international sorption and heat pump conference (ISHPC 2002). Shanghai: China; 2002.  Wang LW, Wu JY, Wang RZ, Xu YX, Wang SG, Li XR. Study on the performance of activated carbon-methanol adsorption systems concerning heat and mass transfer. Applied Thermal Engineering 2003;23:1605e17.  Py X, Daguerre E, Goetz V, Spinner B. Composite material comprising activated carbon and expanded graphite. US Patent 10/182134; 2004.  Tamainot-Telto Z, Critoph RE. Monolithic carbon for sorption refrigeration and heat pump applications. Applied Thermal Engineering 2001;21:37e52.  Wang K, Wu JY, Xia ZZ, Li SL, Wang RZ. Design and performance prediction of a novel double heat pipes type adsorption chiller for fishing boats. Renewable Energy 2008;33(4):780e90.  Mauran S, Coudevylle O, Lu HB. Optimization of porous reactive media for solid sorption heat pumps. In: Proceedings of the international sorption heat pump conference; 1996. p. 3e8.  Py X, Daguerre E, Menard D. Composites of expanded natural graphite and in situ prepared activated carbons. Carbon 2002;40:1255e65.  Han JH, Cho KW, Lee KH, Kim H. Characterization of graphiteesalt blocks in chemical heat pumps. In: Proceedings of the international sorption heat pump conference; 1996. p. 67e73.  Wang LW, Tamainot-Telto Z, Metcalf SJ, Critoph RE, Wang RZ. Anisotropic thermal conductivity and permeability of compacted expanded natural graphite. Applied Thermal Engineering 2010;30(13):1805e11.  Bird RB, Stewart WE, Lightfoot EN. Transport phenomena. New York: Wiley; 1960.  Kiavany M. Principles of heat transfer in porous media. 2nd ed. New York: Springer-Verlag; 1995.|
Actions (login required)