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      Effects of Pressure-Induced Density Changes in the Thermal Energy Absorbed by a Micro-Encapsulated Phase-Change Material

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          Abstract

          Density changes produced by pressure increments during melting of a spherically confined phase-change material have an impact on the thermal energy absorbed by the heat storage unit. Several authors have assumed incompressible phases to estimate the volume change of the phase-change material and the thermal balance at the liquid–solid interface. This assumption simplifies the problem but neglects the contribution of density changes to the thermal energy absorbed. In this work, a thermal balance at the interface that depends on the rate of change of the densities and on the shape of the container is found by imposing total mass conservation. The rigidity of the container is tuned through the coupling constant of an array of springs surrounding the phase-change material. This way, the behavior of the system can be probed from the isobaric to the isochoric regimes. The sensible and latent heat absorbed during the melting process are obtained by solving the proposed model through numerical and semi-analytical methods. Comparing the predictions obtained through our model, it is found that even for moderate pressures, the absorbed thermal energy predicted by other authors can be significantly overestimated.

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          Most cited references29

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          Review on thermal energy storage with phase change materials (PCMs) in building applications

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            State of the art on high temperature thermal energy storage for power generation. Part 1—Concepts, materials and modellization

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              Use of microencapsulated PCM in concrete walls for energy savings

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                Author and article information

                Journal
                Molecules
                Molecules
                molecules
                Molecules
                MDPI
                1420-3049
                30 March 2019
                April 2019
                : 24
                : 7
                : 1254
                Affiliations
                Departamento de Ciencias, Escuela de Ingeniería y Ciencias, Tecnológico de Monterrey Campus Estado de México, Atizapán de Zaragoza, Estado de México 52900, México; emcooper@ 123456tec.mx
                Author notes
                [* ]Correspondence: j.a.otero@ 123456tec.mx
                Article
                molecules-24-01254
                10.3390/molecules24071254
                6480058
                30935080
                b24f3f9f-5ae6-40f8-9405-582de78df2d6
                © 2019 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 22 February 2019
                : 22 March 2019
                Categories
                Article

                phase-change material,micro-encapsulated,thermal energy absorbed,sensible heat,latent heat

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