beam radiation

for aswan, i have conflict to know exactly beam radiation in w/m2
for june ,Aswan...beam normal radiation is 897.167 w/m2
at 12 PM ,aswan.16 june of total hours (3996) is 333.042 w/m2
for total hours with increments of 0.5 hr total hours to 16 june is (3996.5) is 910 w/m2
so please advice

Dear Saeed Aziz,

Are you looking at data from the "Egypt EGY Aswan (INTL)" file that comes with SAM? If so, that data is hourly data, not 30-minute data. The DNI value at Noon on June 16 is about 910 W/m2, but I do not understand where the other values you mention come from.

Best regards,
Paul.