为改善坑式储热水体的温度分层特性,提出内置2 个分割体的方法改善其温度分层特性,同时优化运行参数进一步提升水体的热性能,减少热损失。通过数值模拟方法对比研究不同入口流速、入口温度、分割体高度和位置对水体温度分层特性的影响,并基于理查森数和斜温层厚度等性能评价指标,分析其热性能的变化趋势。研究结果表明：当坑式储热水体体积为10000 m3,分割体高度选用相对较低的5 m,分割体布置在距离进水口相对较远的13 m、出水口相对较远的5 m时,斜温层厚度降低22.9%,理查森数提高53.2%,水体具有最佳的温度分层特性。内置分割体可显著优化水体温度分布,提高能量存储效率。
Abstract
In order to improve the temperature stratification characteristics of the pit thermal energy storage water body, the method of built-in two partitions is proposed to improve the temperature stratification characteristics, and the operating parameters are optimized to further improve the thermal performance of the water body and reduce the heat loss. The effects of inlet flow rate, inlet temperature, height and location of the partitions on the stratification characteristics of water temperature were studied by numerical simulation, and the variation trend of thermal performance was analyzed based on the Richardson number and the thermocline thickness. The results show that when the volume of the pit thermal energy storage water body is 10000 m3, the height of the partitions is 5 m, and the partitions are located 13 m from the inlet and 5 m from the outlet, the thickness of the thermocline is reduced by 22.9%, and the Richardson number Ri is increased by 53.2%. The water body has the best temperature stratification characteristics. The built-in partition can significantly optimize water temperature distribution and improve energy storage efficiency.
关键词
储热 /
温度分层 /
热性能 /
数值模拟 /
优化设计 /
工程应用可行性
Key words
thermal energy storage /
thermal stratification /
thermal properties /
numerical simulation /
optimised design /
engineering feasibility
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基金
国家重点研发计划（2022YFC3802400）; 辽宁省“兴辽英才计划”（XLYC2203184）; 辽宁省教育厅基本科研项目（LJ222410153082）; 辽宁省科学技术厅应用基础研究计划（青年专项）（2023JH2/101600004）
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