Comparative study of different numerical models of packed bed thermal energy storage systems
2013 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 50, no 1, 384-392 p.Article in journal (Refereed) Published
This paper presents, compares and validates two different mathematical models of packed bed storage with PCM, more specifically the heat transfer during charge of the PCM. The first numerical model is a continuous model based on the Brinkman equation and the second numerical model treats the PCM capsules as individual particles (energy equation model). Using the Brinkman model the flow field inside the porous media and the heat transfer mechanisms present in the packed bed systems can be described. On the other hand, using the energy equation model the temperature gradient inside the PCM capsules can be analysed. Both models are validated with experimental data generated by the authors. The experimental set up consists mainly of a cylindrical storage tank with a capacity of 3.73 L full of spherically encapsulated PCM. The PCM used has a storage capacity of 175 kJ/kg between −2–13 °C. The results from the energy equation model show a basic understanding of cold charging. Moreover, three different Nu correlations found in the literature were analysed and compared. All of them showed the same temperature profile of the PCM capsules; hence any of them could be used in future models. The comparison between both mathematical models indicated that free convection is not as important as forced convection in the studied case.
Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 50, no 1, 384-392 p.
Experimental validation, Numerical simulation, Packed bed, Phase change material, Thermal energy storage
IdentifiersURN: urn:nbn:se:kth:diva-104904DOI: 10.1016/j.applthermaleng.2012.07.020ISI: 000314191100044ScopusID: 2-s2.0-84866525926OAI: oai:DiVA.org:kth-104904DiVA: diva2:567809
International Symposium on Innovative Materials for Processes in Energy Systems (IMPRES) - For Fuel Cells, Heat Pumps and Sorption Systems Location: Singapore Date: NOV 29-DEC 01, 2010
QC 201302132012-11-142012-11-142013-03-08Bibliographically approved