Tower

A central tower or central receiver system consists of a hub or field of heliostats, which captures and concentrates the direct component of solar radiation on a receiver that is usually installed on top of a tower. The working fluid can be, among others, air, water vapor, molten sodium or molten salts, as the technology chosen. As in CPV technology, the accuracy is one of the key parameters in heliostats.

Technical paper

Dish Stirling

Stirling disk system consists of a parabolic mirror with a large diameter external combustion engine type 'Stirling' located at its focal area. The parabolic mirror or disc moves through a solar tracker, so that the sun's rays are reflected in its focal plane, thereby obtaining a map of concentrated solar energy, a Gaussian and several tens of kW. Accuracy is also a critical parameter of the tracking.