Thermocline thermal storage for CSP applications: characterization of novel nitrate salt mixtures

IF 2.1 4区 工程技术 Q3 ENERGY & FUELS Journal of Solar Energy Engineering-transactions of The Asme Pub Date : 2022-08-22 DOI:10.1115/1.4055295
G. Canneto, A. Tizzoni, S. Sau, E. Mansi, W. Gaggioli, A. Spadoni, N. Corsaro, M. Capocelli, G. Caputo, Francisca Galindo Paniagua, A. Della Libera
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引用次数: 2

Abstract

Parabolic trough concentrated solar power plants (PTCSP) are particularly promising renewable sources of energy, whose easy integration with Thermal Energy Storage (TES) systems allows to mitigate the intermittency of electricity generation. Currently, molten nitrates, with a two tanks arrangement, are mainly used for sensible heat accumulation. In order to reduce costs and make the CSP storage systems more manageable, single tank configurations have been proposed, where the cold and hot fluids are stored in the same container, and separated because of their density difference. The aim of the present work is to study the storage performances presented by two novel ternary and quaternary mixtures, proposed within the European project IN-POWER. An experimental campaign was preliminarily performed to investigate the fluids thermo-physical properties, and the obtained values were utilized as input data to model the discharge phase in a thermocline tank. The simulation results were compared with the ones acquired considering two commercial materials, namely, Solar Salt and Hitec XL®. Overall, considering same temperature ranges, higher discharging times are obtained for the quaternary and ternary mixtures, with the ternary presenting a smaller thermocline thickness than the solar salt while this parameter is the same considering the quaternary and Hitec XL®.
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CSP应用的温跃层储热:新型硝酸盐混合物的表征
抛物线槽集中太阳能发电厂(PTCSP)是特别有前途的可再生能源,其与热能储存(TES)系统的简单集成可以缓解发电的间歇性。目前,熔融硝酸盐主要用于显热积聚,有两个储罐。为了降低成本并使CSP存储系统更易于管理,已经提出了单罐配置,其中冷流体和热流体存储在同一容器中,并且由于它们的密度差异而分离。本工作的目的是研究欧洲IN-POWER项目中提出的两种新型三元和四元混合物的存储性能。初步进行了一项实验活动来研究流体的热物理性质,并将获得的值用作温跃层槽中排放阶段的输入数据。将模拟结果与考虑两种商业材料(即Solar Salt和Hitec XL®)获得的结果进行了比较。总的来说,考虑到相同的温度范围,四元和三元混合物获得了更高的放电时间,三元混合物呈现出比太阳盐更小的温跃层厚度,而考虑到四元混合物和Hitec XL®,该参数是相同的。
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来源期刊
CiteScore
5.00
自引率
26.10%
发文量
98
审稿时长
6.0 months
期刊介绍: The Journal of Solar Energy Engineering - Including Wind Energy and Building Energy Conservation - publishes research papers that contain original work of permanent interest in all areas of solar energy and energy conservation, as well as discussions of policy and regulatory issues that affect renewable energy technologies and their implementation. Papers that do not include original work, but nonetheless present quality analysis or incremental improvements to past work may be published as Technical Briefs. Review papers are accepted but should be discussed with the Editor prior to submission. The Journal also publishes a section called Solar Scenery that features photographs or graphical displays of significant new installations or research facilities.
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