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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Improvement of the thermal behaviour of gypsum blocks by the incorporation of microcapsules containing PCMS obtained by suspension polymerization with an optimal core/coating mass ratio
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Improvement of the thermal behaviour of gypsum blocks by the incorporation of microcapsules containing PCMS obtained by suspension polymerization with an optimal core/coating mass ratio

机译：通过掺入含有PCMS的微胶囊来改善石膏砌块的热性能，所述PCMS是通过悬浮聚合获得的，芯材和涂层的质量比最佳

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摘要

The feasibility of incorporating microcapsules containing Phase Change Materials (PCMs), previously obtained by a suspension polymerization process, in gypsum wallboards to increase the wall energy storage capacity was studied. Firstly, the energy storage capacity of the resulting microcapsules and the microencapsulation efficiency was maximized by studying the influence of the synthesis variable core/coating mass ratio on the suspension polymerization process. Results indicate that the higher paraffin wax to styrene monomer mass ratio, the lower microencapsulation efficiency. A mass ratio of Rubitherm RT27 to styrene monomer equal 1.5 allowed to obtain microcapsules with the highest energy storage capacity and a good microencapsulation efficiency. It was also observed that the energy storage capacity is dependent on the particle size; the maximum capacity was obtained for a particle size of 500 μm. Finally, the thermal behaviour of three gypsum wallboards one without PCMs and the others doped with 4.7% and 7.5% by weight of microcapsules containing Rubitherm RT27 at the optimal core/coating mass ratio was studied. Results showed that the higher the amount of microcapsules containing PCMs incorporated to the gypsum wallboard, the lower or higher the external wall temperature for heating or cooling process, respectively. Besides, the incorporation of the microcapsules to the wall increased the time required to achieve the final steady state, verifying that the material insulation capacity was enhanced by increasing PCMs content in the wall.
机译：研究了将以前通过悬浮聚合工艺获得的，包含相变材料（PCM）的微胶囊掺入石膏墙板中以增加壁储能能力的可行性。首先，通过研究合成变量核/包衣质量比对悬浮聚合过程的影响，将所得微胶囊的储能能力和微囊化效率最大化。结果表明，石蜡与苯乙烯单体的质量比越高，微囊化效率越低。 Rubitherm RT27与苯乙烯单体的质量比等于1.5，可以得到具有最高储能能力和良好微囊化效率的微囊。还观察到，储能能力取决于颗粒尺寸。粒径为500μm时可获得最大容量。最后，研究了三种石膏墙板的热行为，其中一种不使用PCM，另一种则用4.7％和7.5％重量的含有Rubitherm RT27的微胶囊掺入了最佳的芯/涂层质量比。结果表明，掺入石膏墙板的含PCM的微胶囊数量越高，分别用于加热或冷却过程的外壁温度越低或越高。此外，将微囊掺入壁中增加了达到最终稳态所需的时间，这证明了通过增加壁中的PCM含量可以增强材料的绝缘能力。

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