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Título:
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Heat and mass transfer during adsorption of ammonia in a cylindrical adsorbent bed: thermal performance study of a combined parabolic solar collector, water heat pipe and adsorber generator assembly
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Autor/a:
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Aghbalou, F.; Mimet, A.; Badia, F.; Illa i Alibés, Josep; El Bouardi, A.; Bougard, J.
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Notas:
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In this paper we present the study of adsorption refrigerator which use an activated carbon-pair
ammonia. The ability of activated carbons to adsorb large mass of ammonia makes them ideal for use in
adsorption refrigeration and pump systems. These systems have not reasonable efficiency. In order to make
these systems economically viable, their size must be reduced. This implies a need for a rapid heating and
cooling the adsorbent/refrigerant pair. However, the main problems to be overcome is related to the poor
heat transfer in the adsorbent bed. So, it is necessary to study and understand the heat and mass transfer
within the bed and to improve it. A detailed model of heat and mass transfer into the generator has been
developed. For a given heat flux, temperature and adsorbed mass have been computed in every point at
each step time along the adsorbed bed (generator). Experimental installation simulating an adsorption
machine working within a temperature ranging from 20 to 250 C and pressure ranging from 0 to 2.5 · 106
Pa, allows for identification of the generator’s equivalent thermal conductivity and internal heat transfer
coefficient. These two parameters are then used to simulate thermal performance of a design whose features
include the insertion of stainless steel water heat pipe (HP’s) condensers into the generator. The HP’s evaporator heat input is of solar origin using a compound parabolic collector (CPC). Nominal Solar
coefficient of performance, COPs ¼14.37% obtained through both Adimensional Exergy Loss (AEL), and
COP study, shows the competitiveness of the proposed design. |
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Materia(s):
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-Solar energy
-Refrigeration
-Adsorption |
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Derechos:
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(c) Elsevier, 2004
info:eu-repo/semantics/restrictedAccess |
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Tipo de documento:
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article
publishedVersion |
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Editor:
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Elsevier
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Compartir:
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