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Modelling and development of a generator for a domestic gas-fired carbon-ammonia adsorption heat pump
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Rivero Pacho, Angeles M., Critoph, Robert E. and Metcalf, Steven J. (2017) Modelling and development of a generator for a domestic gas-fired carbon-ammonia adsorption heat pump. Renewable Energy, 110 . pp. 180-185. doi:10.1016/j.renene.2017.03.089 ISSN 0960-1481.
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Official URL: http://dx.doi.org/10.1016/j.renene.2017.03.089
Abstract
Current development of ammonia-carbon gas fired heat pumps at the University of Warwick uses shell and tube adsorption generators with over 1700 water tubes of 1.2 mm outer diameter on a 3 mm pitch filled with vibrated carbon grains and powder. This geometry is not optimised and a dynamic simulation program has been written to determine how far from optimal the design is and also whether an alternative design of finned tubes offer advantages.
Three alternative carbon composites that use Expanded Natural Graphite (ENG), silane and lignin binders have been developed and tested to characterise their thermophysical properties so that they can be included in the simulations in order to improve the thermal transfer in the generators.
Results presented show that the shell and tube geometry is close to optimal and that the best performing material is the lignin+carbon composite.
Other type of geometry, a finned tube design, was modelled as it might offer improvements in performance and help reduce the complexity and cost of the manufacturing technique. Results show that for the same tube radius, the finned tube generator needs 7 times fewer tubes in order to achieve similar performances.
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 -- Design and construction, Adsorption, Refrigerants | ||||||||
Journal or Publication Title: | Renewable Energy | ||||||||
Publisher: | Elsevier Ltd. | ||||||||
ISSN: | 0960-1481 | ||||||||
Official Date: | September 2017 | ||||||||
Dates: |
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Volume: | 110 | ||||||||
Page Range: | pp. 180-185 | ||||||||
DOI: | 10.1016/j.renene.2017.03.089 | ||||||||
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 | ||||||||
RIOXX Funder/Project Grant: |
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