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  4. Analysis of the discharging process of latent heat thermal energy storage units by means of normalized power parameters
 
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2023
Journal Article
Title

Analysis of the discharging process of latent heat thermal energy storage units by means of normalized power parameters

Abstract
Many efforts are being made to mitigate the main disadvantage of most phase change materials - their low thermal conductivities - in order to deliver latent heat energy storage systems (LHESS) with adequate performance. However, the effect of applied methods is difficult to compare as they are mostly tested for different storage types and sizes and/or different boundary and initial conditions, which hinders rapid progress in the optimization of these approaches. In this work, a previously developed method for comparing the performance of LHESS is applied to experimental results of different storage systems under different conditions and subsequently analyzed and further refined. The main idea of the method is to normalize the power with the volume and a reference temperature difference and compare its mean value plotted over the normalized mean capacity flow of the heat transfer fluid (HTF). This enables the presentation of the results in a compact and easily comparative way. Attention has to be paid when it comes to the choice of the reference temperature difference, the reference volume and the method for calculating the mean value. Two variants of calculating the mean value (time-weighted and energy-weighted) and two variants of reference temperatures for determining the temperature difference to the inlet temperature of the HTF (initial temperature and melting temperature) are applied and discussed in detail. While the method significantly increases the comparability of results, none of the options listed above are without drawbacks. Approaches are shown to reduce or eliminate these drawbacks in the future. The recommendation for comparing different LHESS under different conditions is to use the method described here and clearly state the chosen reference temperature, reference volume and method for calculating the mean value.
Author(s)
König-Haagen, Andreas
Univ. Bayreuth
Höhlein, Stephan
Univ. Bayreuth
Lázaro, Ana
University of Zaragoza
Delgado, Mónica
University of Zaragoza
Diarce, Gonzalo
University of the Basque Country UPV/EHU
Groulx, Dominic
Dalhousie University
Herbinger, Florent
Dalhousie University
Patil, Ajinkya
Dalhousie University
Englmair, Gerald
Technical University of Denmark- DTU
Wang, Gang
Technical University of Denmark- DTU
Abdi, Amir
KTH Royal Institute of Technology
Chiu, Justin N.W.
KTH Royal Institute of Technology
Xu, Tianhao
KTH Royal Institute of Technology
Rathgeber, Christoph
Bayerisches Zentrum für Angewandte Energieforschung e.V. (ZAE Bayern)
Pöllinger, Simon
Bayerisches Zentrum für Angewandte Energieforschung e.V. (ZAE Bayern)
Gschwander, Stefan  
Fraunhofer-Institut für Solare Energiesysteme ISE  
Gamisch, Sebastian  
Fraunhofer-Institut für Solare Energiesysteme ISE  
Journal
Journal of energy storage  
Open Access
DOI
10.1016/j.est.2023.108428
10.24406/publica-2103
File(s)
König-Haagen_et_al_2023_analysis_of_discharging_process_of_latent.pdf (3.93 MB)
Rights
CC BY 4.0: Creative Commons Attribution
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • Evaluation

  • Latent heat

  • Performance indicators

  • Phase change materials

  • Power

  • Thermal energy storage

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