Thermal storage and thermal management properties of a novel ventilated mortar block integrated with phase change material for floor heating: an experimental study
Thermal storage and thermal management properties of a novel ventilated mortar block integrated with phase change material for floor heating: an experimental study
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相变材料集成地暖新型通风砂浆块的蓄热与热管理性能实验研究
DOI：
10.1016/j.enconman.2019.112288
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发表时间：
2020-02-01
影响因子：
10.4
通讯作者：
Zou, Bin
中科院分区：
文献类型：
--
作者：
Guo, Jiwei;Jiang, Yiqiang;Zou, Bin
将微胶囊相变材料(PCM)集成到砂浆中可以增大建筑热体的储热容量，但电导率的降低会减缓热响应。本文提出了一种在地板采暖相变材料砂浆砌块中集成通风回路的新方法，以增强能源的灵活性，实现热管理。对微胶囊相变材料复合的一系列透气水泥基砂浆砌块的热能性能进行了试验研究。各区块相变物质含量相同，但分布规律不同，可分为高集中、低集中和均匀分布。采用了单次采暖、通风采暖和间歇采暖三种采暖方案。结果表明，相变材料的分布对储热性能有很大影响。在单一加热场景下，与纯砂浆砌块相比，相变材料砌块的加热能耗可提高11.4%~18%。在通风-采暖模式下，出口空气温度高于空间空气温度，证实了室内空间通风潜力。通风还可延长所需加热时间，使相变材料砂浆砌块耗电量增加7.4%~13%，冷却时间缩短22.7%~25.6%。尤其是在间歇加热模式下，部分浓缩相变材料块的空间加热性能要好得多。从而验证了与相变材料相结合的通风砂浆砌块的储热能力和能量提取灵活性，部分分布的相变材料砂浆砌块表现出比均匀分布的相变材料砂浆砌块更好的热工性能。
Integrating micro-encapsulated phase change material (PCM) in mortar could enlarge thermal storage capacity of building thermal mass, however the reduction of conductivity would slow down thermal response. This article proposes a new method by integrating ventilation loops in floor heating phase change material mortar blocks to enhance the energy flexibility, and achieve thermal management. Experiment was carried out to test the thermal and energy performance of a series of ventilated cement based mortar blocks integrated with micro encapsulated phase change material. The amount of phase change material in each block was the same but the distribution patterns were different, including upper concentrated, lower concentrated and evenly distributed. Three heating scenarios including single heating, ventilation-heating and intermittent heating were conducted. Results indicated that the distribution of phase change material had strong influence on the thermal storage and heating performance. In single heating scenario, compared to pure mortar block, phase change material blocks could increase 11.4% - 18% heating power consumption. In ventilation-heating mode, the outlet air temperature was higher than the space air, which confirmed the inner space ventilation potential. Ventilation could also prolong the required heating time and enlarge 7.4% - 13% power consumption of phase change material mortar block, and reduce 22.7% - 25.6% cooling time. Especially in intermittent heating mode, the space heating performance of partially concentrated phase change material blocks were much better. Thus, the thermal storage capacity and energy extraction flexibility of the ventilated mortar blocks integrated with phase change material were validated, and partially distributed phase change material mortar blocks showed better thermal performance than evenly distributed phase change material mortar block.