Paper Conference

Proceedings of ASim Conference 2016: 3rd Asia conference of IBPSA-China, Japan, Korea

     

VALIDATION OF SIMPLIFIED METHOD TO CALCULATE URBAN SKY OBSTRUCTION BASE ON PARAMETRIC DESIGN PLATFORM

Jie Wu, Zhang Zhang

Abstract: Sky obstruction refers to the sky obstruction caused by the surrounding buildings, trees and structures for an arbitrary point of community. A simplified algorithm for urban sky obstruction was presented in the paper. With the analytical method of inverse trigonometric functions used to calculate the elevation angle of obstruction in the algorithm, SVF, SAR became available. Automatic calculation of the algorithm was achieved by designing RH& GH parametric platform widget with scripting language. After comparative calculation based on ideal calculating examples, building group case and actual residential community cases, the simplified algorithm was verified to feature relatively high calculating accuracy and stability and able to meet the requirements of engineering design. For calculated SVF values, the RMSE≤ 0.04 and index of agreement ≥0.99; for calculated SAR values, the RMSE≤ 0.101 and index of agreement ≥0.96. Compared with previous widgets and software, the simplified algorithm widget took shorter time in calculation while performed better in efficiency. The algorithm and widgets presented in the paper are able to give key technical supports to the assessments of architectural planning and design schemes, including urban microclimate, outdoor thermal comfort and building energy consumption.
Paper:
asim2016_261