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Title:
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Natural convection heat transfer coefficients in phase change material (PCM) modules with external vertical fins
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Author:
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Castell, Albert; Solé Cutrona, Cristian; Medrano Martorell, Marc; Roca Enrich, Joan; Cabeza, Luisa F.; García, Daniel
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Notes:
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To determine the heat transfer coefficient by natural convection for specific geometries, experimental correlations are used. No correlations
were found in the literature for the geometries studied in this work. These geometries consisted of a cylindrical module of 88 mm of
diameter and 315 mm height with external vertical fins of 310 mm height and 20 and 40 mm length. To determine the heat transfer coefficient
by natural convection, experimental work was done. This module, containing PCM (sodium acetate trihydrate), was situated in the
middle upper part of a cylindrical water tank of 440 mm of diameter and 450 mm height. The calculated heat transfer coefficient changed
by using external fins, as the heat transfer surface was increased. The temperature variation of the PCM and the water are presented as a
function of time, and the heat transfer coefficient for different fins is presented as a function of the temperature difference. Experimental
correlations were obtained, presenting the Nusselt number as a function of different dimensionless numbers. Different correlations were
analysed to find which one fit better to the experimental data. |
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Subject(s):
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-Nusselt number
-Rayleigh number
-Experimental correlation |
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Rights:
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(c) Elsevier, 2007
info:eu-repo/semantics/restrictedAccess |
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Document type:
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article
publishedVersion |
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Published by:
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Elsevier
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