<p>With the growing adoption of renewable energy resources in buildings, photovoltaics installation is increasing. Among them, building integrated photovoltaics (BIPV) design has attracted increasing attention worldwide as a way of achieving increased energy efficiency and green house emission reductions. BIPV technologies can not only combine electricity generation with other functions of building materials to yield on-site electricity, but also give an aesthetical and modern appearance. There are various parts of a building to integrate PV systems with building facades, such as exterior walls, roofs, windows, and exterior blinds. To get a successful BIPV project, many considerations for applications should be checked in a practical manner. One of the major considerations is avoidance of shadow effects, especially when BIPV design is applied to blinds. Because the primary purpose of blinds is to block direct sunlight to reduce cooling loads for summer while maintaining indoor visual comforts, it can be necessary to have partial shading effects on PV surfaces for certain periods, which brings about low efficiencies of PV power generation. More shading effects on PV modules of the blinds, less will be the energy efficiency of blind PV modules. Many studies have conducted shading effects of power efficiencies on PV modules, however, potential shading effects of BIPV with exterior blinds have not been explored sufficiently. Therefore, this study evaluates the shading impacts by upper slats in PV blind based on field testing. To examine electrical performance of the PV blind, flexible CIGS modules are used, and the testing is carried out under the shading shapes and shading ratios of PV modules. The field tests are carried out in two steps, including (1) the first test is to evaluate the power generation performance of each slat by connecting I-V Tracer to each module, (2) the second step of the test is evaluated the power generation performance by connecting two modules in series. For the first step, it is conducted for comparative analysis of the difference in power generation performance between the module without shade (upper slats) and the module with shade (lower slats). In second step, this is carried out to analyze the shading effects when many slats were connected in series, such as the actual PV blind. Results indicate that lower efficiencies of PV power generation are captured during operation when partial shading patterns occur on module’s surfaces. The reduction of PV power is presented proportional to shading ratio impact on the surfaces</p>

Potential Effects of Partial Shading on Power Efficiency of Photovoltaic(pv) Integated With Exterior Blind

Paper Proceedings: https://asmedigitalcollection.asme.org/IMECE/IMECE2021/volume/85543

ASME 2021 International Mechanical Engineering Congress and Exposition (IMECE2021)

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