Modification of the Hargreaves–Samani Model for Estimating Solar Radiation from Temperature and Humidity Data
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VIEW THE REPLYPublication: Journal of Irrigation and Drainage Engineering
Volume 144, Issue 1
Abstract
A new formula is introduced to estimate solar radiation, (), using maximum and minimum air temperature, (°C) and (°C), respectively, as well as relative humidity, (%). This technical note describes a modification to the original equation of the Hargreaves–Samani model. The new formula is obtained by calibration using data obtained from a global database. The new version of the formula is: where is the extraterrestrial radiation (). The proposed modification was tested under various climatic conditions using high-quality daily weather data from 32 stations across California, Florida, Arizona, and Greece, showing improvement of the accuracy of estimates of solar radiation. The proposed modification is not as generalized as the original Hargreaves–Samani equation that allows estimation of using widely available and data because it is restricted to locations where good quality data is measured.
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©2017 American Society of Civil Engineers.
History
Received: Feb 1, 2017
Accepted: Aug 29, 2017
Published online: Nov 11, 2017
Published in print: Jan 1, 2018
Discussion open until: Apr 11, 2018
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