Date
2024-06-08Subject
333 Economics of land and energy 600 Technology LatentwärmespeicherMathematisches ModellThermodynamische EigenschaftPhasenübergangswerkstoffWärmeleitfähigkeitMetadata
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Mathematical modelling of a latent heat storage: Influence of PCM thermal conductivity and enthalpy-temperature relationship
Abstract
Mathematical modelling of latent heat storage units is useful to calculate their thermal performance for integration in larger systems. This requires the input of thermophysical properties of the phase change material (PCM) used, but data provided by manufacturers or published in the literature is often incomplete and/or varies between sources. However, it is not clear to what extent an accurate knowledge of these properties, including their phase dependency, is necessary to obtain reliable calculations, especially when air is the heat transfer fluid. This study presents a numerical model for a latent heat storage unit containing PCM in rectangular slabs. The model was validated against own measurements and then employed to assess the effect of the assumed thermal conductivity values and the enthalpy curve shape on calculation accuracy depending on factors such as slab thickness and length, air velocity, PCM type and inlet air temperature. Results show that for thin slabs and/or low air velocity, accurate calculations can be obtained with a constant thermal conductivity within the solid-liquid range, irrespective of the operating conditions and material properties tested. As slab thickness and air velocity increase, conductivity gradually becomes more important. For non-isothermal phase change, the assumption of a linear enthalpy curve is sufficient to obtain accurate performance calculations under the conditions tested.
Citation
In: Journal of Energy Storage Volume 94 (2024-06-08) eissn:2352-1538Sponsorship
Gefördert im Rahmen eines Open-Access-Transformationsvertrags mit dem VerlagCitation
@article{doi:10.17170/kobra-2024061110329,
author={Román, Franz and Munir, Zeeshan and Hensel, Oliver},
title={Mathematical modelling of a latent heat storage: Influence of PCM thermal conductivity and enthalpy-temperature relationship},
journal={Journal of Energy Storage},
year={2024}
}
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2024-06-14T11:15:17Z 2024-06-14T11:15:17Z 2024-06-08 doi:10.17170/kobra-2024061110329 http://hdl.handle.net/123456789/15848 Gefördert im Rahmen eines Open-Access-Transformationsvertrags mit dem Verlag eng Namensnennung 4.0 International http://creativecommons.org/licenses/by/4.0/ latent heat storage phase change materials modelling thermal properties 333 600 Mathematical modelling of a latent heat storage: Influence of PCM thermal conductivity and enthalpy-temperature relationship Aufsatz Mathematical modelling of latent heat storage units is useful to calculate their thermal performance for integration in larger systems. This requires the input of thermophysical properties of the phase change material (PCM) used, but data provided by manufacturers or published in the literature is often incomplete and/or varies between sources. However, it is not clear to what extent an accurate knowledge of these properties, including their phase dependency, is necessary to obtain reliable calculations, especially when air is the heat transfer fluid. This study presents a numerical model for a latent heat storage unit containing PCM in rectangular slabs. The model was validated against own measurements and then employed to assess the effect of the assumed thermal conductivity values and the enthalpy curve shape on calculation accuracy depending on factors such as slab thickness and length, air velocity, PCM type and inlet air temperature. Results show that for thin slabs and/or low air velocity, accurate calculations can be obtained with a constant thermal conductivity within the solid-liquid range, irrespective of the operating conditions and material properties tested. As slab thickness and air velocity increase, conductivity gradually becomes more important. For non-isothermal phase change, the assumption of a linear enthalpy curve is sufficient to obtain accurate performance calculations under the conditions tested. open access Román, Franz Munir, Zeeshan Hensel, Oliver doi:10.1016/j.est.2024.112424 Project number 450248664 Latentwärmespeicher Mathematisches Modell Thermodynamische Eigenschaft Phasenübergangswerkstoff Wärmeleitfähigkeit publishedVersion eissn:2352-1538 Journal of Energy Storage Volume 94 false 112424
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