On specificities of direct solar radiation incoming daily to tilted differently orientated surfaces of helioreceivers
Diurnal cycle of the average long term hourly totals of direct solar radiation, which incomes to the tilted surfaces at real cloudiness terms, is investigated. The data have been received from the Russian actinometrical network. Two types of tilted surfaces were considered: facing the sun, which characterizes maximum of incoming radiation, and at the angle that equals to the place’s latitude. Special attention is focused on contribution of direct solar radiation to total. The graphs of the isopleths allow to consider complexly within-day and within-year structure of incoming direct solar radiation to above mentioned titled surfaces in different regions of Russia.