The dependence on solar elevation of the correlation between monthly average hourly diffuse and global radiation

Journal Article · Fri Jan 01 04:00:00 EST 1988 · Solar Energy; (USA)

DOI:https://doi.org/10.1016/0038-092X(88)90029-1· OSTI ID:5077042

Soler, A ^[1]

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1. Escuela Tecnica Superoir de Arquitectura, Madrid (Spain)

In the present work, the dependence on {anti {gamma}} of the correlation between {anti K}{sub d} = {anti I}{sub d}/{anti I}{sub O} and {anti K}{sub t} = {anti I}/{anti I}{sub o} is studied, {anti I}, {anti I}{sub d}, and {anti I}{sub o} respectively being the monthly average hourly values of the global, diffuse, and extraterrestrial radiation, all of them on a horizontal surface, and {anti {gamma}} the solar elevation at midhour. The dependence is studied for Uccle for the following sky conditions. Condition A: clear skies (fraction of possible sunshine = 1) and the maximum values of direct radiation measured during the period considered (each of the hours before or after the solar noon for which radiation is received); Condition B corresponding to all the values of radiation measured when the sunshine fraction is 1 during the period considered; Condition C; corresponding to all the data collected, independently of the state of the sky; Condition D: corresponding to overcast skies ({anti I} = {anti I}{sub d}). From the available values of {anti I} and {anti I}{sub d} (monthly average hourly direct radiation on a horizontal surface), values of {anti K}{sub d} and {anti K}{sub t} for 5{degree} {le} {anti {gamma}} {le} 45{degree} and {Delta} {anti {gamma}} = 5{degree} are calculated using Newton's divided difference interpolation formula.

• OSTI ID: 5077042
• Journal Information: Solar Energy; (USA), Journal Name: Solar Energy; (USA) Vol. 41:4; ISSN SRENA; ISSN 0038-092X
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140100* -- Solar Energy-- Resources & Availability
CALCULATION METHODS
CORRELATIONS
DIFFUSE SOLAR RADIATION
ITERATIVE METHODS
METEOROLOGY
NEWTON METHOD
RADIATIONS
SOLAR FLUX
SOLAR RADIATION
STELLAR RADIATION