In figure 2, feed-water from the power block is fed directly to the SF, where it is preheated, evaporated and
superheated. The live steam produced in the SF is passed back to the power block where it feeds the turbine. If the
live steam mass flow from the SF exceeds the capacity of the turbine, the surplus of steam is fed to the storage
system for charging. During periods with no or reduced solar irradiation, the accordingly reduced live steam mass
flow can be supplemented by steam from storage discharging. As any other solar thermal power plant a DSG plant
can be equipped by a fossil fired back-up burner (not displayed in figure 2). In this paper the plant set-up from
figure 2 serves as the reference system in this paper.