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Study of thermal conductivity, permeability, and adsorption performance of consolidated composite activated carbon adsorbent for refrigeration

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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 0960-1481

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Abstract

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
Publisher: Elsevier Ltd.
ISSN: 0960-1481
Official Date: 2011
Volume: Volume 36
Number: Number 8
Page Range: pp. 2062-2066
Identification Number: 10.1016/j.renene.2011.01.005
Status: Peer Reviewed
Publication Status: Published
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.
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URI: http://wrap.warwick.ac.uk/id/eprint/41580

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