Abstract
The beam‐down design is standing out as a very promising technology in the field of solar central receiver systems. In this paper, we show that the use of concave heliostats strongly improves the overall performance of the system, allowing for a better concentration of the solar radiation at the receiver. To this aim, the spot at the horizontal plane containing the lower focus of the secondary reflector is analyzed under different conditions, such as secondary reflectors of different eccentricities and solar fields composed of concave or flat heliostats. The performance analysis of a realistic beam‐down system is also proposed to stress both the feasibility of the plant and the need of using concave heliostats. This study has been conducted with the use of the CRS4‐2 numerical code (an acronym for CRS4 research software for Central Receiver Solar System Simulation S), developed in our laboratory.
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