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Selection of refractory materials for Latent Heat Thermal Energy Storage devices
| Content Provider | Zenodo |
|---|---|
| Author | Polkowski, Wojciech Sobczak, Natalia Nowak, Rafał Kudyba, Artur Bruzda, Grzegorz Polkowska, Adelajda Homa, Marta Turalska, Patrycja |
| Abstract | Concentrated solar power (CSP) has been widely recognized as one of the most productive source of green energy. However, one of the main challenge that has to be faced in order to move forward efficiency of the CSP systems is a problem of their performance during sunless periods. Regarding recent economical and ecological issues of modern societies, it is a matter of crucial importance to establish reliable methods for storing the solar energy. In this field, latent heat thermal energy storage (LTHES) based on properly selected phase change materials (PCMs) appears as a very promising approach. Very recently, an integrated solar thermophotovoltaic system based on molten silicon and silicon alloys, has been proposed as the new kind of solid state devices for ultra high temperature energy storage and conversion. The main goal of the AMADEUS Project is to design and develop the new LTHES system having performance properties (mainly in terms of the available energy density and working temperature range) far beyond actually applied molten salt-based systems. Due to very high values of latent heat and melting points silicon and silicon-boron alloys have been pointed out as excellent PCMs candidates. Foundry Research Institute as the participant of the Project and Work Package Leader is mostly involved in the research on high temperature interaction of chosen PCM candidates with refractories that are intended to be applied as the vessel material. However, by taking into account a very high reactivity of molten Si and Si-based alloys as well as a total lack of reported literature data on their behavior at temperatures higher than 1500°C, a selection of proper refractories becomes a very challenging task. Thus, in order to ensure a good reliability and long lifetime of the final LHTES device, it is necessary to experimentally recognize which ceramic materials can withstand such extreme working conditions during a long term service. In this work, we show the results of laboratory evaluation of wettability and reactivity of molten silicon and Si-B alloys with selected ceramics at temperatures up to 1750 °C. The wetting and spreading behavior was examined by using a sessile drop method combined with contact heating procedure, while the reactivity was evaluated on solidified couples by means of optical and scanning electron microscopy (SEM) coupled with energy dispersive X-ray (EDS) microanalysis. |
| Sponsorship | European Commission |
| File Size | 5925971 |
| File Format | |
| DOI | 10.5281/zenodo.1098427 |
| Publisher Date | 2017-09-14 |
| Publisher Place | Varna, Bulgaria |
| Access Restriction | Open |
| Rights License | CC-BY-4.0 |
| Subject Keyword | molten silicon hexagonal boron nitride wettability interfaces AMADEUS Project |
| Content Type | Text |
| Resource Type | Presentation |
