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Ba(OH)2·8H2O/泡沫铜相变复合材料的制备及传热性能

Preparation and heat transfer performance of Ba(OH)2·8H2O/copper foam phase change composites

    摘要
  • 摘要: 采用SEM和X射线能谱仪分析方法研究了50次热循环后Ba(OH)2·8H2O与铝合金和紫铜的相容性,发现Ba(OH)2·8H2O对铝合金有一定的腐蚀性,与紫铜具有优良的相容性.以简单的真空吸附填充方法制备了Ba(OH)2·8H2O/泡沫铜相变复合材料.搭建了含和未含泡沫铜相变储能装置实验台,对Ba(OH)2·8H2O/泡沫铜相变复合材料进行室温下稳态和瞬态的传热实验.结果表明:Ba(OH)2·8H2O/泡沫铜相变复合材料比纯Ba(OH)2·8H2O传热速率快,导热性能好,有效地降低了Ba(OH)2·8H2O的过冷度.高温恒温箱的传热实验表明:Ba(OH)2·8H2O/泡沫铜相变复合材料的蓄热能力随外界环境温度的升高而降低,当环境温度高于材料相变点温度时,应考虑对相变复合材料采取一些保温措施.

     

    Abstract: The compatibility of Ba(OH)2·8H2O with aluminum alloy and copper was studied by SEM and X ray energy dispersive spectrometer analysis methods after 50 thermal cycles. Results show that Ba(OH)2·8H2O displays a certain amount of corrosion in combination with aluminum alloy. Ba(OH)2·8H2O and copper present excellent compatibility. A simple method of successive vacuum absorption and padding was employed to prepare Ba(OH)2·8H2O/copper foam phase change composites. An experimental setup was built to study the heat transfer performances of Ba(OH)2·8H2O with and without copper foams. The steady state and transient heat transfer performances of Ba(OH)2·8H2O/copper foam composites were experimentally measured at room temperature. The results show that Ba(OH)2·8H2O/copper foam phase change composites have higher heat transfer rate, better heat transfer performance and lower supercooling degree than the pure Ba(OH)2·8H2O. The heat transfer experiments indicate that the thermal storage capacity of the composites decreases with the increase of ambient temperature in the high-temperature thermotank. When the ambient temperature is higher than the phase change temperature, some insulation measures should be considered for the phase change composites.

     

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