Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/42003
DC FieldValueLanguage
dc.contributor.authorSoares, N.-
dc.contributor.authorAntunes, P.-
dc.contributor.authorCosta, J.J.-
dc.date.accessioned2017-06-20T10:08:35Z-
dc.date.available2017-06-20T10:08:35Z-
dc.date.issued2017-02-08-
dc.identifier.urihttp://hdl.handle.net/10316/42003-
dc.description.abstractThis paper presents the validation of a numerical model based on the effective heat capacity method to evaluate the heat transfer with melting/solidification of a microencapsulated phase change material (PCM) – Micronal® DS 5001 X – contained in rectangular-sectioned vertical cavities. In this method, the latent heat is modelled in the energy conservation equation as an artificially inflated specific heat within the temperature interval where phase change occurs. Due to the artificial nature of the method, particular attention is addressed to the variation of the effective (or equivalent) heat capacity with temperature in order to ensure a correct prediction of the phase change kinetics and the accurate quantification of the stored/released energy during a charging/discharging cycle of the PCM. Two variation functions were investigated: rectangular and triangular profiles. To validate the numerical results against experimental data from a preceding study, calculations were performed for three configurations of a small thermal energy storage (TES) unit, considering different boundary conditions that were specified in the numerical model as measured during the experiments. In the overall, numerical results show good agreement with experiments. However, it was concluded that the triangular function does not adequately reflect the time evolution of the phase change processes. Furthermore, it leads to a deficit in the latent heat that implies the use of a correction to accurately quantify the total energy stored/released by the PCM. With the appropriate correction, both the rectangular and the triangular approaches provide adequate predictions of the problem kinetics. These considerations must be taken into account in future applications of the effective heat capacity method.por
dc.language.isoengpor
dc.relationPCMs4Buildingspor
dc.relationPOCI-01-0145-FEDER-016750por
dc.relationPTDC/EMS-ENE/6079/2014por
dc.rightsopenAccesspor
dc.subjectPhase change materialspor
dc.subjectPCMpor
dc.subjectEnergy storagepor
dc.subjectEffective heat capacitypor
dc.titleEffective heat capacity method to simulate heat difusion problems with phase changepor
dc.typeconferenceObjectpor
degois.publication.locationFunchal, Portugalpor
degois.publication.titleEnergy for Sustainability International Conference 2017 - Designing Cities & Communities for the Futurepor
dc.peerreviewedyespor
item.fulltextCom Texto completo-
item.grantfulltextopen-
item.languageiso639-1en-
crisitem.project.grantnoPOCI-01-0145-FEDER-016750 | PTDC/EMS-ENE/6079/2014-
Appears in Collections:FCTUC Eng.Mecânica - Artigos e Resumos em Livros de Actas
Files in This Item:
File Description SizeFormat
Effective heat capacity method to simulate heat difusion problems with phase change.pdf692.17 kBAdobe PDFView/Open
Show simple item record

Page view(s) 20

689
checked on Sep 27, 2022

Download(s)

279
checked on Sep 27, 2022

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.