Analytical optimization of interior PCM for energy storage in a lightweight passive solar room
Analytical optimization of interior PCM for energy storage in a lightweight passive solar room
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DOI：
10.1016/j.apenergy.2008.12.011
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发表时间：
2009-10
期刊：
影响因子：
11.2
通讯作者：
Wei Xiao;Xin Wang;Yin-ping Zhang
中科院分区：
文献类型：
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作者：
Wei Xiao;Xin Wang;Yin-ping Zhang
轻量化围护结构在现代建筑中得到了广泛的应用，但它们缺乏足够的热容量来实现被动式太阳能的利用。增加建筑热容量的一个有吸引力的解决方案是在建筑围护结构中加入相变材料（PCM）。本文建立了一个简化的理论模型，用于优化轻型被动式太阳能房间的室内PCM储能。给出了计算最佳相变温度和总潜热容的解析方程，并估计了内部相变介质储能的效益。最后，以北京实际室外气候条件下的直接增益室内PCM板为例进行了分析优化。分析结果与数值结果吻合较好。分析结果表明：(1)最佳相变温度取决于室内平均温度和PCM板吸收的辐射；(2)室内PCM对室内平均气温影响不大；(3)室内空气温度波动的幅度取决于轻型被动式太阳能房间中PCM板的表面换热系数hina与面积A的乘积。
Lightweight envelopes are widely used in modern buildings but they lack sufficient thermal capacity for passive solar utilization. An attractive solution to increase the building thermal capacity is to incorporate phase change material (PCM) into the building envelope. In this paper, a simplified theoretical model is established to optimize an interior PCM for energy storage in a lightweight passive solar room. Analytical equations are presented to calculate the optimal phase change temperature and the total amount of latent heat capacity and to estimate the benefit of the interior PCM for energy storage. Further, as an example, the analytical optimization is applied to the interior PCM panels in a direct-gain room with realistic outdoor climatic conditions of Beijing. The analytical results agree well with the numerical results. The analytical results show that: (1) the optimal phase change temperature depends on the average indoor air temperature and the radiation absorbed by the PCM panels; (2) the interior PCM has little effect on average indoor air temperature; and (3) the amplitude of the indoor air temperature fluctuation depends on the product of surface heat transfer coefficient hinand area A of the PCM panels in a lightweight passive solar room.