Evaluation of the state of charge of a solid/liquid phase change material in a thermal energy storage tank
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Monitoring of the state of charge of the thermal energy storage component in solar thermal systems for space heating and/or cooling in residential buildings is a key element from the overall system control strategy point of view. According to the literature, there is not a unique method for determining the state of charge of a thermal energy storage system that could generally be applied in any system. This contribution firstly provides a classification of the state-of-the-art of available techniques for the determination of the state of charge, and secondly, it presents an experimental analysis of different methods based on established sensor technologies, namely temperature, mass flow rates, and pressure measurements, tested using a lab-scale heat exchanger filled with a commercial phase change material for cooling applications. The results indicate that, depending on the expected accuracy and available instrumentation, each of the methods studied here can be used in the present application, the deviations between the methods generally being below 20%. This study concludes that a proper combination of two or more of these methods would be the ideal strategy to obtain a more reliable and accurate estimation of the state of charge of the latent heat thermal energy storage.
Is part ofEnergies, 2020, vol. 13, p. 1425-1-1425-26
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Barz, Tilman; Emhofer, Johann; Marx, Klemens; Zsembinszki, Gabriel; Cabeza, Luisa F. (Edicions de la Universitat de Lleida, 2019)Thermal energy storage technologies through solid/liquid phase change materials (PCMs) use the thermodynamic principles of melting and solidification to absorb and release thermal energy. In the ideal case, this technology ...
Barz, Tilman; Emhofer, Johann; Marx, Klemens; Zsembinszki, Gabriel; Cabeza, Luisa F. (Taylor & Francis, 2019)Technical-grade and mixed solid/liquid phase change materials (PCM) typically melt and solidify over a temperature range, sometimes exhibiting thermal hysteresis. Three phenomenological phase transition models are presented ...
Phase change material selection for two innovative compact energy storage systems in residential buildings Zsembinszki, Gabriel; Gasia, Jaume; Oró Prim, Eduard; Cabeza, Luisa F. (Ediciones de la Universidad de Castilla-La Mancha, 2019)Within the framework of HYBUILD, an EU Horizon 2020-funded project, two innovative compact hybrid electrical/thermal storage systems for stand-alone and district connected residential buildings will be developed and ...