Comparative Analysis of Heat Storage Processes of Concrete and Concrete-Molten Salt Heat Storage Structures

Abstract

在环境污染和能源高效利用的双重背景下，为电蓄热装置设计高效的蓄热结构显得尤为重要。本文以混凝土和混凝土-熔盐两种蓄热结构为研究对象，通过数值模拟的方法，对两种蓄热结构的蓄热过程进行模拟分析。研究结果表明，当考虑熔盐在相变过程中的自然对流时，混凝土–熔盐的蓄热结构比混凝土蓄热结构在8小时后的蓄热量大。当相变层距加热面135 mm时，复合体8小时后的蓄热量相比混凝土蓄热体的蓄热量来说增加了32.31%。相关结论为电蓄热供暖系统的工程应用提供技术参考。 Under the dual background of environmental pollution and efficient energy utilization, it is par-ticularly important to design efficient heat storage structures for electric heat storage devices. In this paper, the heat storage process of concrete and concrete-molten salt heat storage struc-tures is simulated and analyzed by means of numerical simulation. The results show that when considering the natural convection of the molten salt in the phase change process, the heat storage structure of the concrete-molten salt is larger than that of the concrete after 8 hours. When the phase change layer is 135 mm away from the heating surface, the heat storage capaci-ty of the composite after 8 hours is increased by 32.31% compared with that of the concrete heat storage body. The relevant conclusions provide a technical reference for the engineering application of electric thermal storage heating systems.