ESTIMATION OF HOURLY SOLAR IRRADIATION OVER THE UK
The principle objective is to obtain methods of estimating climatological averages of the components of hourly irradiation, using hourly sunshine records, with a small number of empirical constants. This approach was not extended to include estimation explicitly for inclined surfaces. The estimation of global irradiation on a horizontal surface (method HGSUN) is achieved from a simple linear relation with bright sunshine, similar to the Angstroem (1924) equation. The estimation of direct irradiation on a sun-following surface (method HISUN) adopts a value of turbidity calculated from the sum of Angstroem global irradiation coefficients. Hourly diffuse irradiation is determined from the difference of HGSUN and HISUN estimates. The ratios of mean hourly to mean daily sunshine from a number of sites are combined to give a single table of values, dependent upon daylength, allowing the estimation of hourly from daily sunshine. Average daily sunshine from 150 stations is used to construct hourly irradiation maps for the United Kingdom by an objective scheme which employs low order orthogonal polynomials to smooth the irradiation fields and to provide values for the data sparse areas.
Bibliographic Reference: EUR 9482 EN (1984), MF, 79 P., BFR 120, BLOW-UP COPY BFR 395, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989123077500 / Last updated on: 1987-01-01
Available languages: en