Central solar concentration with two fluids in the receiving and storage

Central solar thermal condensable fluid concentration with multitube receiver (5) with areas of low radiation (2), intermediate (3) and upper (4) such that the low radiation (2) is used to heat the working fluid cycle, liquid from the condensing temperature, from a condenser (13) of varying level, to the evaporation, being stored in a reboiler (12) of variable level at that temperature. Radiation areas intermediate (3) and upper (4) are used to heat a heat transfer fluid from the minimum temperature to the maximum temperature, being stored in two or three storage tanks (9, 10 and 11) at different temperatures for a subsequent heat transfer to the working fluid to evaporate and overheat before entering the turbine (32) of the cycle.