火墙环境下有机相变材料封装盒体的导热增强

为提高火墙环境下有机相变材料宏观封装盒体的吸热效率,通过实验室恒温箱模拟火墙环境条件,研究了添加不同数量导热翅片和填充泡沫铜对有机相变材料宏观封装盒体吸放热过程的影响.结果表明:随着导热翅片数量增加,不同厚度封装盒体中相变材料的完全相变时间明显缩短,而导热翅片数量过多时会显著降低厚度较小封装盒体的有效放热时间;填充泡沫铜使宏观封装盒体中相变材料的温度分布更加均匀,同时可进一步降低厚度较大封装盒体中相变材料的完全相变时间;通过添加15个导热翅片和填充泡沫铜可使45 mm厚封装盒体中相变材料的完全相变时间缩短64.8%,此方法可有效解决火墙环境中大容量宏观封装有机相变材料盒体的吸热缓慢问题.

Heat transfer improvement of macro encapsulation box of organic phase change material under hot wall environment

A simulated hot wall condition was provided by a thermostat oven in lab and the exothermic and endothermic process of organic phase change material macro encapsulation box was measured when different quantity of conductive fins was installed or the box was filled with copper foam. The results show that the increasing quantity of fins leads to the reduction of complete phase transformation time, while the installation of excessive fins can decrease the effective heat release time for the package box with small thickness. The usage of copper foam results in the more uniform temperature distribution, and further reduces the complete phase transformation time in thick encapsulation box. The complete phase transformation time in a 45 mm thick encapsulation box is decreased by 64.8% when both the installation of 15 conductive fins and the copper foam filling are applied. The application of these two methods provides a good solution for the slow endothermic process of macro encapsulation box containing huge volume of organic phase change material under hot wall environment.