A study on zenith luminance on Madrid overcast skies

被引：9

作者：

Soler, A

Gopinathan, KK

Claros, ST

机构：

[1] Univ Politecn Madrid, Escuela Tecn Super Arquitectura, Dept Fis, E-28040 Madrid, Spain

[2] Univ Politecn Madrid, Fac Ciencias Ambientales, E-28040 Madrid, Spain

[3] Natl Univ Lesotho, Dept Phys, Lesotho, South Africa

来源：

RENEWABLE ENERGY | 2001年 / 23卷 / 01期

关键词：

D O I：

10.1016/S0960-1481(00)00158-0

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The zenith luminance has been measured at Madrid for skies with a cloud cover of 7-8 oktas and experimental mean 15-min values of L-z have been obtained. Among the most accurate fits to the data, a 2nd degree polynomial for L-z against tan(alpha) is the most simple. When only data for a cloud cover of 8 oktas are used a similar fit is obtained, but for a smaller coefficient of correlation, due to the smaller amount of data. A linear, second degree, or power dependence for L-z against sin(alpha )obtained by other researchers, does not give the best fit for our data. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：49 / 55

页数：7

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[4]

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