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Study of thermal conductivity and geometry wall contact resistance effect of granular active carbon for refrigeration and heat pumping systems
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Rivero Pacho, Angeles M., Critoph, Robert E. and Metcalf, Steven J. (2015) Study of thermal conductivity and geometry wall contact resistance effect of granular active carbon for refrigeration and heat pumping systems. Heat Transfer Engineering, 37 (7-8). pp. 720-728. doi:10.1080/01457632.2015.1067094 ISSN 0145-7632.
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Official URL: http://dx.doi.org/10.1080/01457632.2015.1067094
Abstract
The commercial success of sorption refrigeration and heat pump systems depends on a good heat and mass transfer in the adsorbent bed, which allows higher coefficients of performance and greater specific heating or cooling power that reduce capital costs. In this study the thermal conductivity and thermal contact resistance of vibrated and compressed granular active carbon and binary mixtures of active carbon are investigated using two types of conductivity measurements: a steady-state measurement between flat plates and a transient hot tube measurement. With these results is possible to draw conclusions on how the wall geometry, particle size distribution, and bulk density affect the overall thermal performance. Results show that using binary mixtures of grains and powder gives results superior to those of either grains or powder alone. The conductivity of the binary mixtures increases roughly linearly with bulk density and the 2/3 grain mixture achieves the highest densities. The method used to achieve compaction (vibration or compression) did not seem to affect the result. Thermal contact resistances reduce with increasing density but do vary with the mixture ratio, also appearing to be best with a 2/3 grain–1/3 powder mixture.
Item Type: | Journal Article | ||||||
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Subjects: | T Technology > TJ Mechanical engineering and machinery | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||
Library of Congress Subject Headings (LCSH): | Heat pumps -- Thermodynamics, Adsorption, Carbon, Activated | ||||||
Journal or Publication Title: | Heat Transfer Engineering | ||||||
Publisher: | Taylor & Francis Inc. | ||||||
ISSN: | 0145-7632 | ||||||
Official Date: | 16 November 2015 | ||||||
Dates: |
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Volume: | 37 | ||||||
Number: | 7-8 | ||||||
Page Range: | pp. 720-728 | ||||||
DOI: | 10.1080/01457632.2015.1067094 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||
Date of first compliant deposit: | 12 January 2018 | ||||||
Date of first compliant Open Access: | 12 January 2018 |
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