【摘要】 储放热效率低已成为制约相变储热装置规模化推广的关键难题，为此设计了一种球形胶囊填充式相变储热装置，提出了石蜡和月桂酸相变材料混合填充模式，研究了单填充及混合填充对装置储热性能与相变行为影响。结果表明：混合填充模式通过协同传热机制整合不同相变材料优势，装置总体储热特性显著提升，能量密度和储热效率分别达516048 k J/m~3和62.02%，液相率为0.45，轴向温度均匀性提升40%，取热阶段温度下降速率减缓30%，有效缓解相分离现象；包覆聚苯乙烯保温层后，装置能量密度和储热效率提升47.20%和41.15%，热损失降低68.80%，储热速率达928.8 kJ/h，储热阶段材料和流体均温提升5??10??C，取热阶段供能时长延长40%。研究结果可为高可靠性相变储热系统设计与制造提供理论支撑。更多还原

【Abstract】 The low efficiency of heat storage and discharge has become a key problem that restricts the scale promotion of phase change heat storage device, in this regard, a spherical capsule filling phase change heat storage device was designed, and a mixed filling mode of paraffin and lauric acid phase change materials was proposed, and the impact of single filling and mixed filling on the thermal performance and phase change behavior of the device was investigated. The results show that the hybrid filling mode integrates the advantages of different phase change materials through the synergistic heat transfer mechanism, and the overall thermal storage characteristics of the device are significantly improved, with the energy density and thermal storage efficiency reaching 516048 kJ/m~3 and 62.02%, respectively, the liquid-phase rate is 0.45, the axial temperature uniformity is improved by 40%, and the rate of temperature drop in the heat extraction stage is slowed down by30%, which effectively mitigates the phase separation phenomenon; After wrapping the polystyrene insulation layer, the energy density and heat storage efficiency of the device are increased by 47.20%and 41.15%, the heat loss is reduced by 68.80%, the heat storage rate reaches 928.8 kJ/h, the average temperature of the material and fluid in the heat storage phase is increased by 5??10??C, and the duration of the energy supply in the heat extraction phase is prolonged by 40%. The research results support for the design and manufacture of high-reliability phase change heat storage systems.更多还原