| 摘要: |
| 通过免蒸压法制备加气混凝土(AC)，并在制备过程中加入以RT25石蜡为相变材料的相变微胶囊(MPCMs)，得到相变微胶囊/加气混凝土复合材料（以下简称复合材料）．在17、40℃下测试复合材料的导热系数和比定压热容，研究了这些参数与相变微胶囊掺量的关系，同时计算出复合材料的蓄热系数，据此评价了其蓄热性能．结果表明：随着相变微胶囊掺量的增加，复合材料的导热系数和比定压热容均呈现先增加后降低的趋势；当相变微胶囊掺量为10%时，复合材料具有最好的蓄热性能，较不掺相变微胶囊的对照组增强74%，蓄热系数可达335W/(m2·K). |
| 关键词: 加气混凝土 相变微胶囊 导热系数 蓄热系数 热工性能 |
| DOI：103969/j.issn1007 9629202002016 |
| 分类号: |
| 基金项目: |
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| Thermal Performances of Micro encapsulated Phase Change Materials/Aerated Concrete Composite Materials |
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LU Jiang1, QU Mingliang2, TIAN Shuaiqi2
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1.School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou 310023, China;2.School of Energy Engineering, Zhejiang University, Hangzhou 310027, China
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| Abstract: |
| Aerated concrete(AC) was prepared by the non autoclaving method, and micro encapsulated phase change materials(MPCMs) were added during the preparation process to obtain MPCM/AC phase change composite materials and RT25 paraffin was selected as the phase change material(PCM). The specific heat capacity of the composite samples was measured at both 17，40℃, while the paraffin was in solid and liquid phases, respectively. Dependence of the MPCMs loading and the effective thermal conductivity were also investigated. Furthermore, the heat storage coefficients of the composite materials were derived from the above parameters to evaluate the thermal performance of composite materials. Results show that both the effective thermal conductivities and specific heat capacities increase upon adding the micro encapsulated paraffin. However, they are found to decrease at further increase of the paraffin loading. The w(MPCMs)=1.0% composite materials samples are found to have the best heat storage performance, its coefficient of heat accumulation reaches 335W/(m2·K), better than the control group by 74%. |
| Key words: aerated concrete(AC) micro encapsulated phase change material(MPCMs) thermal conductivity coefficient of heat accumulation thermal performance |
