Daily global solar radiation estimation based on air temperature: case of study south of Algeria

Razika Ihaddadene,Nabila Ihaddadene,Amaury De Souza,Mohamed El Hacen Ould Ahmedou Bemba Jed Jed,W Cui

doi:10.1051/e3sconf/20198001002

Abstract

Global solar radiation is needed for the analysis and scaling of solar conversion systems; however, global measurements of solar radiation are not available in all Algerian cities. The use of empirical models using an accessible parameter is a solution to this problem. In this study, seven empirical Models namely Hargreaves and Samani, Chen, M.F. Li, H.Li, Bristow and Campbell, Okonkwo and Abraha Savage have been employed to estimate daily average global solar radiation on the horizontal surface. These models use extreme temperatures (minimum and maximum). They were applied to three south Algerian sites (Biskra, Ghardaia, and Tamanrasset). The analyzed data were provided by the NASA site and cover four years (2001-2004). The validation of the models for predicting daily global solar radiation was done using four statistical parameters (R2, MBE, RMSE, and RPE). The results show that Bristow and Compbell Model shows better performance than the other models in all sites. A new model is proposed for each site. The results show that this later is the best one compared with the seven models analyzed. Therefore, the developed model can be suggested to estimate daily global solar radiation using only extreme air temperatures in south Algeria.

Highlights

Due to its geographic location, Algeria has the largest solar field in the world
Seven empirical models mentioned above namely; Model 1, Model 2, Model 3, Model 4, Model 5, Model 6 and Model 7 are compared in order to determine their suitability to estimate the global solar radiation received on a horizontal surface at three south Algerian cities (Biskra, Ghardaia and Tamanrasset)
Okonkwo et al [21] proposed a new model for estimating global solar radiation in Minna (Nigeria) by using a quadratic model based on the temperature ratio (Tmin/Tmax)

Summary

Introduction

The sunshine duration of virtually all the national territory exceeds 2000 hours annually and can reach 3900 hours in High lands and in Sahara. The daily-obtained energy on a horizontal surface of 1 m2 is about 5 kWh over the major part of the national territory, or about 1700 kWh/m2/year in the north and 2263. KWh/m2/year in the south of the country [1]. The measurement stations of various components of solar radiation are scarce or almost non-existent on all the national territory. While general meteorological parameters (pressure, temperature (max and min), sunshine duration, humidity, wind speed .., etc.) are available at Meteorology National Office stations. It is interesting to develop mathematical models to describe the various components of solar radiation as a function of these parameters

Objectives

Methods

Results