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Development of a Solar Insolation Calculation Module in Urban Context Using the Sunlit Fraction and Sky-view Factor
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 Title & Authors
Development of a Solar Insolation Calculation Module in Urban Context Using the Sunlit Fraction and Sky-view Factor
Kim, Eui-Jong;
 
 Abstract
Recently, development of detailed urban energy consumption prediction tools becomes a rising issue as it can provide more quantitative and qualitative information for planning a sustainable city. One of the target physical phenomena related to the urban case is to correctly calculate the solar irradiance on building envelops with taking into account the shading and mask effects. The sunlit fraction(SF) is commonly used to calculate the effective beam solar irradiance, and the sky-view factor(SVF) is used for the precise diffuse irradiance in the urban context. Both indicators are also employed in this work, and they are calculated using the polygon clipping method. The proposed solar insolation calculation module is implemented in Python, and results from the module are compared with existing SketchUp Plug-in tools. Results show that SF and SVF obtained from the module are almost the same as the existing tools, giving only less than 2% errors over the year. A case study is also carried out for comparison between the urban case and the single building case. As expected, total monthly insolation in the single building case is overestimated with a mean difference of about 20%.
 Keywords
Urban insolation;Shading;Polygon Clipping Method;Sunlit Fraction;Sky-View Factor;
 Language
Korean
 Cited by
1.
용적률이 패시브 공동주택 난방 에너지요구량에 미치는 영향 분석,이명주;김원식;김현아;

대한건축학회논문집:계획계, 2015. vol.31. 5, pp.15-24 crossref(new window)
2.
도시 밀집지역에서 인접건물의 음영을 고려한 냉난방 에너지부하 분석,고종환;허정호;

대한건축학회논문집:계획계, 2015. vol.31. 7, pp.57-64 crossref(new window)
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