Proceedings of the 1986 International Congress on Renewable Energy Sources. Spectral and energetic measurements of solar irradiance. International Congress on Renewable Energy Sources [18-23 Mayo 1986, Madrid].

Consejo Superior de Investigaciones Científicas.
Pons, A. Corróns, A.

1987

CIENA
1113
v. 2

84-00-6674-X

The initial scope of this work has been to realize an experimental system which continously measures the solar irradiance without direct exposure of the detecting elements to the solar radiation. In this way it is possible to avoid the problems of atmospheric variations (temperature, moisture, dust) inherent in the direct exposure of the measuring systems to the solar irradiance. The solution adopted was to bring the solar radiation from outside through an optical conductor to detectors placed inside the building. The radiant energy is conducted from the roof of the building by an optical fiber to the detectors below. This allows the detection and measurement equipment to be inside the laboratory, and only one end of the optical fiber, with a diffuser coupled to it to approximete the cosine law is directly exposed to the ambient meteorological variations. Am automatic data-acquisition system receives the signal from the detectors and computes it introducing the necessary corrections. The resultant measurement is printed in W m-2 at the out put. Additional measuring units, including narrow transmission filters between optical fiber and silicon detector, have been introduced to study spectral variations of the solar irradiance. The parameters of a theoretical model have been adjusted to fit the real spectrum of solar irradiance received in Madrid. With these model we have got a representative equation of direct spectral solar irradiance in Madrid at typical clear days. Knowledge of turbidity coefficient and aerosol size distribution can be obtained using the spectral measurements.. INTRODUCTION. EXPERIMENTAL DESCRIPTION. MEASUREMENTS AND CALCULATIONS. CONCLUSIONS. REFERENCES.

Presenta diagrs.

GENERAL; ENERGIA SOLAR; IRRADIACION; SISTEMAS DE MEDICION;