Tree shading factor as input for thermal model through hemispherical photography
(2021) 2021 Building Simulation Conference
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- Abstract
- Solar irradiation contributes to heat gain through building envelopes and has a significant impact on building energy consumption. Trees help reduce incident irradiation and need to be considered as exterior obstructions in energy models. Deploying robust models in early design stages is integral to designing energy efficient buildings. The challenge lies with the limited research on individual tree shade characteristics, in the domain of building energy simulation. A simplified methodology considering tree shade factors incorporating the essence of the complex underlying geometry-without compromising on data accuracy for detailed energy estimation in various engines-is thus required. This work presents Shading Factor (SHF) as a dynamic temporal schedule, calculated using data measured from on-site hemispherical photographs and simulations performed in Honeybee tools in Rhino Grasshopper, for modelers to use as alternative to arbitrary shading values. Key Innovations: Provides an easy methodology for various simulation engines to incorporate site trees and make informed decisions adhering to a site thereby reducing computational power and time in complex tree modeling for architects and energy analysts.
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Citations
Srivastava, S., Puchalapalli, S., & Maskarenj, M. (2021). Tree shading factor as input for thermal model through hemispherical photography. Building Simulation Conference Proceedings : Proceedings of Building Simulation 2021: 17th Conference of IBPSA. Published. 2021 Building Simulation Conference. https://doi.org/10.26868/25222708.2021.30272 (Original work published 2021)