| Project/Area Number |
08455270
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Architectural environment/equipment
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
KOGA Yasuko GRADUATE SCHOOL OF HUMAN-ENVIRONMENT STUDIES,KYUSHU UNIVERSITY,ASSOCIATE PROFESSOR, 大学院・人間環境学研究科, 助教授 (60225399)
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| Co-Investigator(Kenkyū-buntansha) |
KOJO Shin'ya ARCHITECTURAL DEPARTMENT,WEST JAPAN ENGINEERING CONSULTANTS,RESEARCHER, 建築部, 研究員
NAKAMURA Hiroshi FACULTY OF HUMAN LIFE AND ENVIRONMENTAL SCIENCES,KOCHI WOMEN'S UNIVERSITY,PROFES, 生活科学部, 教授 (10024209)
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| Project Period (FY) |
1996 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥6,300,000 (Direct Cost: ¥6,300,000)
Fiscal Year 1998: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1997: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1996: ¥2,700,000 (Direct Cost: ¥2,700,000)
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| Keywords | DAYLIGHT / SOLAR RADIATION / ILLUMINANCE / IRRADIANCE / SKY LUMINANCE / SKY RADIANCE / CIE STANDARD CLEAR SKY / CIE STANDARD OVERCAST SKY / 昼光照明 |
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| Research Abstract |
In general, daylight and solar radiation data should be arranged and investigated according to sky conditions when the data are acquired. The objective of this research is to establish a method of easily inferring the sky condition when daylight and solar radiation are measured. The method is to be applicable to the cases when minimal items are measured. The researchresults are the followings :
1) Inference of the sky condition by illuminance measurements
The sky conditions were divided into three categories : clear, intermediate and overcast sky conditions. Diffuse horizontal illuminance and vertical illuminance facing four cardinal directions are computable for the clear and overcast skies from CIE standard clear sky and CIE standard overcast sky respectively, with proposed equations for the zenith luminance. They are also obtained by measurements. This research adopted the relative difference between the measured value and the theoretically-calculated value for inferring the sky condition. Limits of the relative difference were decided for the clear and overcast skies.
2) Inference of the sky condition by irradiance measurements
The sky conditions were divided into four categories : clear, near clear, near overcast and overcast sky conditions. Measured sky radiance distributions were arranged from the clear to overcast skies. The procedure involved matching the sky radiance distributions with the sky luminance distribution data arranged according to the sky conditions on the basis of the correlations with two CIE standard sky models. As the result of examination on ordering indexes of the sky radiance distributions, "relative global irradiance" was adopted for inferring the sky condition. It is the horizontal global irradiance multiplied by the relative optical air mass and divided by the extraterrestrial normal irradiance. Ranges of the relative global irradiance were decided for the four sky conditions in respective groups classified by solar altitude.
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