Photovoltaic parabolic solar concentrators
In the energy field El.Ma. is currently engaged in the development and realization of solar systems for the electrical and thermal energy cogeneration, mainly of cylindrical parabolic and dish concentrators with electronical control for the sun following.
Dish parabolic solar concentrators
The orientable dish parabolic concentration system is made up of an aluminium paraboloid with a polymeric layer inside with reflectivity of almost 100%.
On the focus spot, moved along the symmetry axis in order to guarantee an uniform distribution on all the surface by the solar radiation, a receiver of circular geometry is applied.
It is made up of an array of GaAs photovoltaic cells with high efficiency, a substrate and the dissipation system.
The photovoltaic cells are applied on a thermal dissipation system made up of a substrate of ceramic materials characterized by high thermal conductivity and zero electrical conductivity.
The active exchanger through the fluid flow, ensures the heat recovery generated from the cooling of the photovoltaic cells.
The aim of the cogenerative system is the production of an electrical power of about 0.5 kWel and a thermal power of about 1.5 kWth.
The following picture shows a prototype realized by El.Ma.:
The plant disposes on a biaxial automatic sun tracker (azimuth and elevation) developed by El.Ma., that permits to receive the solar radiation with the optimum angle.
Through a supervision program connected to a net of more concentrators, it's possible control the whole plant locally and/or remotely by intervening on the process parametres of any concentrator.
Moreover, there is a synoptic displaying the position of the concentrators in order to make the plant supervision easier.