COMPUTING DIAGRAMS FOR DIRECT DAYLIGHT FACTORS AFFECTING THE VERTICAL PLANE ILLUMINATED BY NON-UNIFORM SOURCE SURFACES : PART II

KOZIMA TAKEO, HIGA SHUNTARO, NISHI YASUO, OKAMOTO SHUNJI

doi:10.3130/aijsaxx.178.0_63

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Other Title

C.I.E. 標準曇天光による直接照度の計算図表 : その 2・鉛直面照度に関する図表
C.I.E.標準曇天光による直接照度の計算図表-2-鉛直面照度に関する図表
C I E ヒョウジュンドンテンヒカリニヨルチョクセツショウドノケイサンズヒョウ 2 エンチョクメンショウドニカンスルズヒョウ

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Some formulate for computing the direct daylight factors which are attributable to source surfaces of a rectangular and a right-angled triangle shape in vertical and horizontal positions were introduced by the authors in the paper of the previous issue of this Transactions. The formulae are derived on the assumption that the luminance of source surface is so distributed that B(θ)=B_Z(1+2sinθ)/3, where θ is the altitude of that part of the source surfaces where the luminance equals B(θ) and B_Z is the luminance identical with π/2. The present formulae are more complex, and therefore the calculation more tedious, than those derived on the assumption of uniform luminance. The authors have worked out some computing diagrams for convenience of calculation. The diagrams for vertical plane of illumination are given in this paper (Fig. 1). The examples of application are shown in Table-1 on Page 63, together with the symbols used in the diagrams. As an example of application, the authors have calculated the distribution of direct vertical daylight factors on the horizorital plane illuminated by vertical source surface of rectangular shapes. For convenience sake they have also another calculation of the formula to be applied in this example. Simplified results are given in Table-3, 4 on page 71. 72.

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Transactions of the Architectural Institute of Japan

Transactions of the Architectural Institute of Japan 178 (0), 63-73,127, 1970

Architectural Institute of Japan

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