Influence of a building's integrated-photovoltaics on heating and cooling loads
Influence of a building's integrated-photovoltaics on heating and cooling loads
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DOI：
10.1016/j.apenergy.2005.10.002
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发表时间：
2006-09
期刊：
影响因子：
11.2
通讯作者：
Yiping Wang;W. Tian;Jianbo Ren;Li Zhu;Qingzhao Wang
中科院分区：
文献类型：
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作者：
Yiping Wang;W. Tian;Jianbo Ren;Li Zhu;Qingzhao Wang
光伏建筑一体化（BIPV）有潜力成为城市环境中可再生能源的主要来源。由于添加或更换建筑构件会导致热阻发生变化，BIPV 对通过建筑围护结构的传热具有重大影响。使用四种不同的屋顶来评估 BIPV 对建筑物热负荷和冷负荷的影响；即通风气隙BIPV、非通风（封闭）气隙BIPV、闭屋顶安装BIPV以及无光伏无气隙的传统屋顶。推导了四种情况的一维瞬态模型，以评估不同屋顶的光伏性能和建筑冷热负荷，以便在中国天津选择合适的光伏建筑集成方法。模拟结果表明，带有通风气隙的光伏屋顶适合夏季应用，因为这种集成导致冷负荷低和光伏转换效率高。与其他三种屋顶相比，带通风气隙的光伏屋顶具有较高的时滞和较小的衰减系数，并且具有与吸收率0.4的冷屋顶相同的得热量。在冬季，由于光伏屋顶的低热负荷和高光伏发电输出的结合，非通风气隙的BIPV更合适。
Building integrated photovoltaics (BIPV) has the potential to become a major source of renewable energy in the urban environment. BIPV has significant influence on the heat transfer through the building envelope because of the change of the thermal resistance by adding or replacing the building elements. Four different roofs are used to assess the impacts of BIPV on the building’s heating-and-cooling loads; namely ventilated air-gap BIPV, non-ventilated (closed) air-gap BIPV, closeroof mounted BIPV, and the conventional roof with no PV and no air gap. One-dimensional transient models of four cases are derived to evaluate the PV performances and building cooling-and-heating loads across the different roofs in order to select the appropriate PV building integration method in Tianjin, China. The simulation results show that the PV roof with ventilated air-gap is suitable for the application in summer because this integration leads to the low cooling load and high PV conversion efficiency. The PV roof with ventilation air-gap has a high time lag and small decrement factor in comparison with other three roofs and has the same heat gain as the cool roof of absorptance 0.4. In winter, BIPV of non-ventilated air gap is more appropriate due to the combination of the low heating-load through the PV roof and high PV electrical output.