Space heating performance of novel ventilated mortar blocks integrated with phase change material for floor heating
Space heating performance of novel ventilated mortar blocks integrated with phase change material for floor heating
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相变材料集成地暖新型通风砂浆砌块采暖性能
DOI：
10.1016/j.buildenv.2020.107175
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发表时间：
2020-08
影响因子：
7.4
通讯作者：
Jiang Yiqiang
中科院分区：
文献类型：
--
作者：
Guo Jiwei;Zou Bin;Wang Yuan;Jiang Yiqiang
能源柔性建筑是可再生能源渗透的一种很有前途的建筑形式，内置通风管道的电热地板是其中的一种重要形式。然而，这种热主动系统的热性能和能量性能仍然是不清楚的，这使得有必要建立一个可靠的热模型，这种系统。建立了一套小型实验系统，测试了4种通风砂浆砌块在不同运行方式下的采暖性能和能耗特性，并将3种砌块集成为不同分布的微胶囊相变材料（PCM）。分析了砂浆块表面温度、空间空气平均温度、黑地球仪温度和功率消耗等关键参数。结果发现，当PCM集中在上部，并且在加热的同时开始通风时，与不通风的加热相比，加热功率消耗增加了41.5%。为了进一步进行预测控制，还建立了简化的状态空间模型，并通过实验数据进行了验证。在此基础上，分析了砂浆块厚度、空气流速和管道直径等几何参数和操作参数对流动的影响。结果表明：砌块厚度对砂浆砌块表面温度影响最为显著，通风量对室内空气热响应性影响较大，而管径对砌块和空间空气的热工性能有综合影响。
Energy flexible building is promising for the penetration of renewable energy, and electric heating floor with built-in ventilation duct is one important form. However, the thermal and energy performance of such thermal active system is still unclear, which makes it necessary to develop a reliable thermal model of such system. In this research, a scale experimental system was established to test the space heating performance and energy consumption characteristics of four ventilated mortar blocks under different operational modes, and three blocks were integrated with different distributions of micro-encapsulated phase change material (PCM). An analysis was conducted of the critical parameters including the surface temperature of mortar block, the average temperature of space air, the temperature of black globe and the power consumption. It was found out that when PCM was concentrated on the upper part, and ventilation started at the same time as heating, the heating power consumption was increased by up to 41.5% compared to the heating without ventilation. For a further predictive control, a simplified state space model was also established and validated by the experimental data. Additionally, the impact of some geometrical and operational parameters was also analysed based on the model, including the thickness of mortar block, the air speed and the diameter of tube. It was demonstrated that the thickness of block had the most significant impact on the surface temperature of mortar block, ventilation rate had a considerable impact on the thermal responsiveness of indoor air, and tube diameter had a comprehensive impact on the thermal performance of block and space air.
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