为解决现有储能系统季节性的水泵驱动显热换热储释能过程中固有的较高驱动能耗和较低换热效率问题,提出一种新型两相被动式储冷系统。通过搭建的两相被动式储冷系统实验平台,实测不同充液率和冷源温度下采用工质R22和R410A时系统回路温度和管道压强分布,分析新型系统启动特性及热性能,获得储冷体冷量扩散温度分布特性。结果表明,系统回路温度随着冷源温度的降低而降低,冷源温度由-2 ℃降低至-12 ℃时,R22和R410A的冷凝器出口温度分别降低了10.6 ℃和7.1 ℃;充液率对系统工质循环具有重要影响,实验范围内R22和R410A的最低注冷热阻分别为0.09 ℃/W和0.097 ℃/W,分别出现在充液率50%和充液率70%工况;运行14 d后,水箱整体温度低于3.8 ℃,储冷效果良好,可为被动式储冷系统进一步优化设计与应用研究提供理论依据。
Abstract
To address the inherent problems of high driving energy consumption and low heat exchange efficiency during the seasonal operation of existing energy storage systems driven by water pumps in charging and discharging processes, a novel two-phase passive cold energy storage system is proposed. An experimental platform is constructed to measure the temperature and pressure distributions under different filling rates and cold source temperatures with R22 and R410A as working fluids. The effects on the system start-up characteristics and thermal performance are analyzed, and the temperature distribution characteristics within the cold energy storage body are obtained. The results show that the temperature of the system loop decreases with the decrease of the cold source temperature. When the cold source temperature decreases from -2 ℃ to -12 ℃, the outlet temperatures of the condenser for R22 and R410A decrease by 10.6 ℃ and 7.1 ℃, respectively; The filling rate exerts a significant influence on the circulation of the working fluid. Within the experimental range, the minimum cold energy transfer resistances of R22 and R410A are 0.090 ℃/W and 0.097 ℃/W, which occur at filling rates of 50% and 70%, respectively; After 14 days of operation, the overall temperature of the water tank remains below 3.8 ℃, demonstrating a favorable cold energy storage performance. This study provides a theoretical basis for the further optimal design and application research of passive cold energy storage systems.
关键词
储能 /
储冷 /
被动冷却 /
两相流 /
热性能 /
传热
Key words
stored energy /
cold storage /
passive cooling /
two phase flow /
thermal performance /
heat transfer
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基金
安徽省优秀青年教师培育项目（YQYB2024032）; 智能建筑与建筑节能安徽省重点实验室开放课题（IBES2024ZR03）; 安徽省新时代育人质量工程项目（研究生教育）（2024lhpysfjd055; 2024zyxwjxalk134）
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