KIEAE Journal

  • 제14권4호
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  • Pages.35-45
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  • 2014
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  • 2288-968X(pISSN)
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  • 2288-9698(eISSN)
한국생태환경건축학회 (Korea Institute of Ecological Architecture and Environment)
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An Effective Algorithm for Transmitted Solar Radiation Calculation through Window Glazing on a Clear Day

  • 투고 : 2014.06.30
  • 심사 : 2014.08.28
  • 발행 : 2014.08.31
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초록

The main objective of this study is to provide an effective algorithm of the transmitted solar radiation calculation through window glazing on a clear day. This algorithm would be used in developing a computer program for fenestration system analysis and shading device design. Various simulation methods have been evaluated to figure out the most accurate and effective procedure in estimation of transmitted solar radiation on a tilted surface on a clear day. Characteristics of simulated results of each step have been scrutinized by comparing them with measured results of the site as well as results from other simulation programs. Generally, the Duffie & Beckman's solar calculation method introducing the HDKR anisotropic model provided the most reliable simulation results. The DOE-2 program usually provided over-estimated simulation results. The estimation of extraterrestrial solar radiation and beam normal radiation were conducted pretty accurately. However, the solar radiation either on horizontal surface or on tilted surface involves complicated factors in estimation. Even though the estimation results were close to the real measured data during summer when solar intensity is getting higher, the estimation provided more error when solar intensities were getting weaker. The convex polygon clipping algorithm with homogeneous coordinates was fastest model in calculation of sunlight to shaded area ratio. It could not be applied because of its shape limitation.

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