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Simultaneous charging and discharging of phase change materials: Development of correlation for liquid fraction

Joybari, MM, Haghighat, F, Seddegh, S and Yuan, Y 2019 , 'Simultaneous charging and discharging of phase change materials: Development of correlation for liquid fraction' , Solar Energy, vol. 188 , pp. 788-798 , doi: 10.1016/j.solener.2019.06.051.

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Abstract

In this study, a method to track the melting front of phase change materials (PCMs) is developed under simultaneous charging and discharging (SCD) inside horizontal triplex tube heat exchangers. For SCD, the heat transfer mode of internal heating and external cooling is investigated. According to the heat transfer mechanism within the PCMs, two models of pure conduction (PC) and combined conduction and natural convection (CCNC) are developed and solved using ANSYS Fluent (version 17.2). Generally, during charging (i.e. melting), the buoyancy forces induce the liquid PCM to move upwards; therefore, the upper section of the storage is affected. However, this motion is limited during SCD due to the simultaneous cooling from the outer tube. Therefore, a front tracking method is developed assuming that natural convection only contributes melting to the upper section of the storage unit. On the other hand, it is assumed that the melting front for the lower section behaves similar to the PC model. In this study, three PCMs are used in three geometries to develop the correlations using two dimensionless numbers; i.e. liquid fraction of the PC model and the storage radius ratio. Another PCM is then used to verify the method. The correlations can provide results in the range of ±15% discrepancy.

Item Type: Article
Authors/Creators:Joybari, MM and Haghighat, F and Seddegh, S and Yuan, Y
Keywords: front tracking, phase change material, natural convection, triplex tube heat exchanger, simultaneous charging and discharging
Journal or Publication Title: Solar Energy
Publisher: Pergamon-Elsevier Science Ltd
ISSN: 0038-092X
DOI / ID Number: 10.1016/j.solener.2019.06.051
Copyright Information:

© 2019 International Solar Energy Society. Published by Elsevier Ltd. All rights reserved.

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