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Techno-economic analysis for constructing solar photovoltaic projects on building envelopes

机译：在建筑围护结构上建设太阳能光伏项目的技术经济分析

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摘要

Solar energy applications in buildings are crucial to urban sustainable development and commercial energy investment. Increased environmental and economic awareness, coupled with local governmental incentives, inevitably causes a growth in construction of photovoltaic (PV) projects. Previous studies extensively explored and developed life cycle energy assessment and costing analysis for payback times of rooftop PV systems. This paper presents a new methodology that combines a life cycle cost (LCC) approach and a pixel method for visualising economic performances of constructing PV projects. The time of recovering the expenditure invested in a PV project is then considered a main economic indicator and is formulated mathematically in the pixel unit representing an actual area of 3 cm x 3 cm in an empirical study. A building model derived from a real student accommodation is then chosen as a case study in this paper. The 3D visualisation demonstrates a potential investment return for placing each solar panel on a specific site over roofs and facades. The proposed contour lines of economic returns also illustrate the optimum ranges for constructing potential PV projects with desirable payback periods during their lifetimes. Results reveal that the facade installation is sometimes competitive with the roof-top installation. This study will benefit designers and construction managers in determining the optimal solution of implementing the rooftop and fa ade PV systems in the phases of design and construction.
机译：建筑中的太阳能应用对于城市可持续发展和商业能源投资至关重要。环境和经济意识的增强，再加上地方政府的鼓励，不可避免地导致了光伏（PV）项目建设的增长。先前的研究广泛探索并开发了生命周期能量评估和屋顶光伏系统投资回收时间的成本分析。本文提出了一种新方法，该方法结合了生命周期成本（LCC）方法和像素方法，可直观地显示光伏项目的经济绩效。然后，将收回在光伏项目中投入的支出的时间视为主要的经济指标，并在经验研究中以代表3 cm x 3 cm实际面积的像素单位数学公式化。然后，从一个实际的学生住宿中得出的建筑模型被选为案例研究。 3D可视化展示了将每个太阳能电池板放置在屋顶和立面上方特定位置的潜在投资回报。拟议的经济收益等值线还说明了在潜在的光伏项目生命周期内建设具有理想投资回收期的最佳范围。结果表明，立面安装有时与屋顶安装竞争。这项研究将有利于设计师和施工经理确定在设计和施工阶段实施屋顶和外墙光伏系统的最佳解决方案。

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