RESULTS AND DISCUSSION
The on-site (Hassi R’mel, Algeria) the average day temperature during
21st of March is equal to 20°C [32] which
corresponds to the design conditions and selected as the reference day
in the present study. The solar field subprogram calculates the supplied
solar energy to HSSG, which according to Fig. 6 illustrates the
variation of DNI during the day and shows that at midday its
maximum reaches a value of 770 W/m2. Fig. 7 represents
the subsequent solar thermal output during the day as it varies with the
solar radiation from sunrise until sunset.