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.

Cylindric parabolic solar concentrators

The current system of orientable concentration solar collectors contains 2 glass mirrors made up of a multilayer "sandwich" bent inside the structure.

The absorber tube is located on the focus line and it is made up of an alluminium central tube with a black surface in order to obtain an high absorption coefficient and low emissivity. Moreover it is externally insulated thanks to a coaxial pirex glass tube with high transparency for the radiation in the visible field.

Inside the absorber tube a pump circulates the fluid, that allows the production of sanitary water through a heat exchanger, for a thermal power of more than 5 kW_th.

There is the idea to exploit a mirror for the thermal and electrical energy generation through high efficiency photovoltaic cells.

The aim of the cogenerative system is the production of an electrical power of about 1 kW_el and a thermal power of about 4 kW_th.

The following picture shows a prototype realized by El.Ma.:

The plant disposes of an automatic one-axis sun following system (azimuth) developed by El.Ma., that permits to receive the solar radiation with the optimum angle.

Elevation is costant during the time and it depends on the latitude of the installation site.

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 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 kW_el and a thermal power of about 1.5 kW_th.

The following picture shows a prototype realized by El.Ma.:

The plant disposes on an automatic two-axis sun following system (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, the program will show a synoptic displaying the position of the concentrators in order to make the plant supervision easier.


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