储能科学与技术

• 储能测试与评价 •    

植物工厂储热装置性能强化研究

葛群1, 梁涛1, 侯彬2, 王万红2, 张龙1, 吴梁玉3, 张程宾4, 刘向东3   

  1. 1.山东电力工程咨询院有限公司，山东 济南 250013
    2.五凌电力有限公司，湖南 长沙 410004
    3.扬州大学电气与能源动力工程学院，江苏 扬州 225127
    4.东南大学能源与环境学院，江苏 南京 210096
  • 收稿日期:2024-02-27 修回日期:2024-03-15
  • 基金资助:
    国家自然科学基金项目(52376077)

Performance enhancement of thermal energy storage units for plant factory

Qun GE1, Tao LIANG1, Bin HOU2, Wanhong WANG2, Long ZHANG1, Liangyu WU3, Chengbin ZHANG4, Xiangdong LIU3   

  1. 1.Wuling Power Co. , Ltd. , Changsha 410004, Hunan, China
    2.Shandong Electric Power Engineering Consulting Institute Co. , Ltd. , Jinan 250013, Shandong, China
    3.College of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, Jiangsu, China
    4.School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China
  • Received:2024-02-27 Revised:2024-03-15

摘要：

为克服固液相变材料的低导热性缺点，本文在传统的套管式固液相变储热器中引入了泡沫金属结合金属肋片的传热强化手段，在储热器内部部分填充泡沫金属以进一步加快储热过程。本文探索了多种不同的储热器内部分填充泡沫金属的设置方式，基于enthalpy-porosity方法对相变材料储热熔化过程进行了数值研究，对比了不同泡沫金属设置方式下储热器内相变材料的动态熔化规律、温度响应特点、储热器的无量纲储热量与储热器经济性的差异。结果表明，配置泡沫金属后，相变材料熔化时间最大可缩短约85%，泡沫金属填充位置对其强化性能起到了决定性的作用。泡沫金属填充于远离热媒管的肋片末端与储热器外壳之间是最优的泡沫金属布置形式，其单位时间储热量是未配置泡沫金属的储热器的6.5倍。最后，本文针对具有最优泡沫金属布置形式的储热器在多种不同加热温度下的熔化过程进行了计算，提出了基于傅里叶数Fo与斯蒂芬数Ste的相变材料熔化进程预测拟合公式。本研究有助于推动固液相变储热技术的发展，为设计应用于植物工厂的太阳能光热相变储热器提供参考和指导。

关键词: 植物工厂, 储热, 相变材料, 性能强化

Abstract:

To overcome the shortcomings of low thermal conductivity of PCM, a heat transfer enhancement approach of metal foam combined with metal fins is introduced for tube-shell latent energy storage units (LESU). The metal foam is partially filled in the LESU to further accelerate the heat transfer process during energy storage. Various configuration of metal foam is examined in this work. Based on the enthalpy-porosity method, the melting process of PCM enhanced by metal fins and metal foam in a LESU is studied numerically. The dynamic melting process, temperature response, dimensionless heat storage capacity, and economical efficiency of the LESU with different configuration of metal foam are compared. The results show that metal foam is highly effective in enhancing the energy storage process in PCM that the melting time of PCM can be shortened by up to 85%. The filling position of foam metal plays a crucial role in its enhancement performance. The optimal configuration of metal foam is to fill the metal foam between the tip of the fin which is away from the heat transfer fluid and the shell of LESU. The thermal energy storage capacity per unit time in the LESU with optimal configuration of metal foam is 6.5 times that of LESU without foam metal. Based on the optimal configured LESU, the variation of the liquid fraction of PCM under different heating temperatures are calculated and nondimensionalized. A fitting formula for predicting the melting process of PCM based on Fourier number (Fo) and Stefan number (Ste) is proposed. This work is beneficial for the development of solid-liquid phase change thermal storage technology and provides reference and guidance for the design of solar photovoltaic LESU applied in plant factories.

Key words: plant factory, thermal energy storage, phase change material, performance enhancement

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