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

König-Haagen, Andreas; Höhlein, Stephan; Lázaro, Ana; Delgado, Mónica; Diarce, Gonzalo; Groulx, Dominic; Herbinger, Florent; Patil, Ajinkya; Englmair, Gerald; Wang, Gang; Abdi, Amir; Chiu, Justin; Xu, Tianhao; Rathgeber, Christoph; Pöllinger, Simon; Gschwander, Stefan; Gamisch, Sebastian

doi:10.1016/j.est.2023.108428

Cited by 2 publications

(1 citation statement)

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“…For exemplary measurements, Q : v is shown in Figure 16 versus the normalized time t Ã for better comparison of the systems like those described by König-Haagen et al [66] Due to the different capacities and sizes of the system, the duration of the charging and discharging is different. Thus, a comparison with absolute time is more difficult.…”

Section: Resultsmentioning

confidence: 99%

Thermal Storage: From Low‐to‐High‐Temperature Systems

et al. 2023

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Different technologies of cold and heat storages are developed at Fraunhofer ISE. Herein, an overview of ongoing research for sensible and latent thermal energy storages is provided. Phase change emulsions are developed supported by molecular dynamic simulations. A narrow temperature range of the phase change is crucial for the applicability. By the simulations, a nucleation additive is identified that reduces supercooling by up to 9 K. The long‐term stability of phase change material is investigated by degradation experiments. Thermal cycling and ageing of materials at elevated temperature are applied. The change of melting enthalpy and characteristic temperatures are evaluated. Among erythritol, adipic acid, and myristic acid, the smallest degradation is observed for the latter. For sensible storage, the reduction of thermal oil by low‐cost filler materials and their compatibility is investigated at elevated temperature. It can be concluded that the materials are compatible up to 320 °C. At the component level, different macroencapsulations and immersed heat exchangers are tested for phase change materials. The investigated configurations achieve similar values of thermal power during (dis‐)charge. Compared to water as storage medium, the capacity increases by a factor of 2.2 and 4.1 for the macroencapsulation and the immersed heat exchanger, respectively.

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Section: Resultsmentioning

confidence: 99%