دانلود رایگان مقاله الگوریتم جستجوی سیستماتیک برای پتانسیل حرارتی سیستم انرژی

Abstract

Thermochemical energy storage (TCES) is considered as an emerging green technology for increased energy utilization efficiency, thereby achieving a reduction of greenhouse gases. Various reaction systems based on different substance classes (e.g. hydrates, hydroxides, oxides) were suggested and investigated so far. Nevertheless, the number of know reactions which are suitable is still limited, as the main focus concentrates on the investigation of a handful known substances, their further improvement or applicability. To find novel promising candidates for thermochemical energy storage and also to allow for a broader view on the topic, this work present a systematic search approach for thermochemical storage reactions based on chemical databases. A mathematical search algorithm identifies potential reactions categorized by the reactant necessary for the reaction cycle and ranked by storage density. These candidates are listed in the online available VIENNA TCES-database, combined with experimental results, assessing the suitability of these reactions regarding of e.g. decomposition/recombination temperature, reversibility, cycle stability, etc.

5. Conclusion

The increased perception of TCES materials witnessed in the recent years stimulated the authors to look for a novel, systematic approach to this topic. Due to the so far limited number of investigated reactions the authors considered the provision of a database, allowing for a broader overview on principally suitable TCES reactions, as well as for a quick identification of the corresponding parameters and experimental data. This could offer advantages for researchers and future industrial users as a variety of reactions, covering different temperature and reactive gas profiles are easily searchable. The reactions entered in the VIENNA TCES-database are selected from chemistry databases; so far the HSC database was used as source. By the use of a systematic search algorithm potentially suitable candidates for TCES reactions were identified. The algorithm screens for reaction couples, where both educts and products have a database entry and can be matched via mathematical analysis of the corresponding elemental coefficients. Nevertheless, a control eliminating stoichiometric correct couples, where a reaction cannot occur, has to avoid chemically nonsense entries. According to this approach, and limited to gas-solid reactions, for a combination of five reactive gases led to 1012 principally suitable TCES materials (H2O 553 hits, CO2 40 hits, NH3 39 hits, SO2 28 hits and O2 352 hits).