| Title |
Performance Evaluation of Building Integrated Photovoltaic(BIPV) module by Self-shading Effect of Building Forms |
| Authors |
Yoon Jong-Ho ; Kim Byoung-Soo |
| Keywords |
Building Integrated PV ; Self-shading ; Building Forms ; Power Shadow Area ; Output ; Integrated Energy Simulation |
| Abstract |
Because the solar cells are in series, if the performance of one cell is impaired by shading, the output current from the whole string is affected and minor shading can result in a major loss of energy. Shadowing will depend on the geography of the site, neighbouring buildings and self-shading by the architectural forms. Especially, self-shading due to the architectural form should be avoided, which is mainly responsible to a architect. The aim of this study is to evaluate the effect of self-shading by building forms in BIPV application. Firstly, annual average shading area ratios(SAR) of south faced PV facade are evaluated depending on the extrusion length ratio(ELR) of horizontal and vertical self-shading mass. Secondly detailed full energy simulations with ESP-r program are conducted to evaluate annual power output variation depending on the ELRs. All the effects for BIPV output calculation such as surface temperature of PV module, ambient temperature, diffuse radiation, incidence angle of insolation are considered in those simulations with actual hourly climate data of Daejeon. Various quantitative relationship of self-shading pattern and PV power output are proposed as results |