Implementation and verification of an empirical solar radiation model for horticultural applications
Solar radiation is one of the parameters recorded at an automatic field weather station operated by the Department of Scientific and Industrial Research (DSIR) near Auckland. A numerical model to calculate clear sky irradiance as a function of time and location was implemented, to assist with interpretation of the automatically recorded data. The validity of the model was checked by comparing its predictions with the solar irradiance measured at hourly intervals on 24 clear days. The comparisons suggested that use of the model should be restricted to times when the sun elevation is greater than 20 degrees. Examples of applications of the model are given.