“…For the applications of solar energy in oil industry, researchers studied using solar thermal energy in heating viscous fuel oil to about 50°C and stored at that temperature [8,9], heating crude oil to maintain flow ability during transportation [10][11][12][13] and thermal treatment of crude oil by heating water in the collector to 85-90°C then heated water exchanges heat with crude which is heated to 55-60°C [14].…”