Technical performance assessment of phase change material components

Titelangaben

Lazaro, Ana ; Delgado, Monica ; König-Haagen, Andreas ; Höhlein, Stephan ; Diarce, Gonzalo:
Technical performance assessment of phase change material components.
2019
Veranstaltung: IEA SHC International Conference on Solar Heating and Cooling for Buildings and Industry 2019 , 3.-7. Nov. 2019 , Santiago, Chile.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Paper )
DOI: https://doi.org/10.18086/swc.2019.22.05

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Abstract

Thermal energy storage systems using phase change materials (PCM) should meet the application requirements in terms of technical and economical parameters. The storage capacity and storage density are the two main parameters for the selection of a suitable storage material. However, among the technical parameters, high thermal power is one of the most challenging characteristics for a PCM thermal storage. Most of the materials currently used as PCM have intrinsically low thermal conductivity; therefore, the component design has to compensate this. This paper presents a definition of a set of parameters to describe PCM heat exchangers in terms of capacity and density. Furthermore, a power performance assessment is proposed based on the analysis of the results obtained for different storage systems based on the same geometry. A validated numerical model is used to assess the suitability of the proposed parameters to compare PCM systems with different configurations and operation conditions. The influence of Biot number, Stefan number, HTF volume and NTU(varied by different mass flows) on the proposed parameters is studied.