Investigation on the daylight and overall energy performance of semi-transparent photovoltaic facades in cold climatic regions of China
Investigation on the daylight and overall energy performance of semi-transparent photovoltaic facades in cold climatic regions of China
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DOI：
10.1016/j.apenergy.2018.10.006
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发表时间：
2018-12
期刊：
影响因子：
11.2
通讯作者：
Yuanda Cheng;Min Gao;Jiankai Dong;J. Jia;Xudong Zhao;Guiqiang Li
中科院分区：
文献类型：
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作者：
Yuanda Cheng;Min Gao;Jiankai Dong;J. Jia;Xudong Zhao;Guiqiang Li
建筑一体化半透明光伏发电技术因其在可再生能源利用方面的明显优势而受到越来越多的关注。然而，STPV立面在采光和节能之间存在潜在的利益冲突。为此，本文对中国寒冷气候地区的建筑立面采光和整体能耗进行了调查，以期解决这一矛盾。首先，通过实验验证了Daysim中采光模型的可靠性。此外，考虑到眩光现象，合理设置室内光照阈值，提出了一种新的动态采光评价指标“N-DaylitArea”。在此基础上，采用综合模拟的方法，研究了透过率、朝向和窗墙比等几个关键设计参数对安装在普通参照室的STPV幕墙性能的影响。根据模拟结果，建议STPV幕墙的透过率和WWR分别在50-60%和40-50%的范围内，以在保证测试房间的采光质量的前提下提高STPV幕墙的能效。此外，结果还表明，朝南是STPV立面的首选朝向，以获得最佳的采光质量和最低的空间年净用电量。
Building-integrated semi-transparent photovoltaics (STPV) technology has attracted more and more attentions for its obvious advantage in renewable energy utilization. However, the STPV facades have potential conflicts of interest between daylighting and energy efficient. Thus, this paper reported an investigation of the daylighting and overall energy performance of STPV facades in cold climatic regions of China, with the aim of resolving the conflicts. Firstly, the reliability of daylighting model in Daysim was experimentally verified. In addition, a novel dynamic daylighting evaluation metric named “N-Daylitarea” was developed, considering the glare phenomenon and setting reasonable indoor illumination thresholds. On basis of this, the effect of several key design parameters, including transmittance,orientation and window-wall ratio (WWR), on the performance of STPV facades installed in a generic reference office was studied, by using a comprehensive simulation method. According to the simulation result, the transmittance and WWR of the STPV façade were recommended to be in the ranges of 50–60% and 40–50%, respectively, for the purpose to improve the energy efficiency of STPV facades with the premise of ensuring a satisfied daylight quality of the tested room. Furthermore, the results also revealed that south facing was the preferred orientation of STPV facades, to obtain the best daylighting quality and the lowest annual net electricity use of the space.