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Song, Hyun-Kon
eclat: ElectroChemistry Lab of Advanced Technology
Research Interests
  • Electrochemical analysis, electroactive materials, electrochemistry-based energy devices

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Enhancement of heat and mass transfer in silica-expanded graphite composite blocks for adsorption heat pumps: Part I. Characterization of the composite blocks

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Title
Enhancement of heat and mass transfer in silica-expanded graphite composite blocks for adsorption heat pumps: Part I. Characterization of the composite blocks
Author
Eun, Tai-HeeSong, Hyun-KonHan, Jong HunLee, Kun-HongKim, Jong-Nam
Keywords
Adsorption; Composition; Graphite; Heat transfer; Mass transfer; Mechanical permeability; Mechanical variables measurement; Refrigeration; Silica gel; Thermal expansion; Water
Issue Date
2000-01
Publisher
ELSEVIER SCI LTD
Citation
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, v.23, no.1, pp.64 - 73
Abstract
Composite blocks for adsorption heat pumps of water/silica gel systems were manufactured by mixing expanded graphite powders and silica gel powders, then by consolidating them via compressive molding. Optimum expansion condition was determined as 600 degrees C for 10 min by investigating carbon and sulfur contents during expansion. Amounts of water adsorption, gas permeability and thermal conductivity were measured for the composite blocks prepared with various compositions and molding pressures. Expanded graphite in the composite blocks had no effects on the equilibrium adsorption amount of water on silica gel and increased the rate of adsorption. The composite blocks of 20-30% graphite fraction under 4-40 MPa molding pressure showed good permeability of 3 to 40x10(-12)m(2). Permeability increased with graphite fraction at constant molding pressure. Thermal conductivity of the composite blocks was 10-20 Wm(-1) K-1 depending on the graphite bulk density (rho(gr)) in the block. It is a much higher value than 0.17 Wm(-1) K-1 in silica-gel packed bed. (C) 1999 Elsevier Science Ltd and IIR. All rights reserved
URI
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DOI
10.1016/S0140-7007(99)00035-3
ISSN
0140-7007
Appears in Collections:
ECHE_Journal Papers
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